142-588: The San Francisco–Oakland Bay Bridge , commonly referred to as the Bay Bridge , is a complex of bridges spanning San Francisco Bay in California . As part of Interstate 80 and the direct road between San Francisco and Oakland , it carries about 260,000 vehicles a day on its two decks. It includes one of the longest bridge spans in the United States . The toll bridge was conceived as early as
284-452: A FasTrak Flex tag are given. This is a backup in case a transponder fails to read. Otherwise, for a designated FasTrak-only facility, including most express lanes, a toll violation notice is sent to the registered owner of the vehicle, or in the case of a non-Fastrak-only facility, including all toll bridges, an invoice (with no penalty) is sent to the registered owner. In the case of drivers whose vehicles are company owned or leased, as long as
426-409: A FasTrak transponder can use it to pay tolls on any California toll facility using the system. Each center establishes its own fee and discount structures. Each FasTrak account agency has its own monthly minimums / monthly fees (from lowest to highest) The standard FasTrak transponder tag can be used by most vehicles. Transportation Corridor Agencies (TCA) also offers a sticker transponder that has
568-502: A bridge had a widespread public and political appeal. Yet the task was too much of an engineering and economic challenge, since the bay was too wide and too deep there. In 1921, more than forty years after Norton's death, an underground tube was considered, but it became clear that one would be inadequate for vehicular traffic. Support for a trans-bay crossing increased in the 1920s based on the popularity and availability of automobiles. The California State Legislature and governor enacted
710-736: A carpool or a registered CAV (and thus do not have to pay a toll) by removing their transponder from the windshield or covering their tag in the provided mylar bag. Neither the Orange County toll roads operated by the TCA nor the South Bay Expressway toll road in San Diego County offer carpooling or CAV discounts. Some agencies like the Bay Area FasTrak center, Metro ExpressLanes , and SANDAG may offer
852-563: A dynamite blast on the eastern side of the island at 12:58 p.m. local time. Former President Herbert Hoover and Governor James Rolph were onsite; the two men were the first to turn over the earth with ceremonial golden spades. Other ceremonies took place simultaneously in San Francisco (on Rincon Hill ) and Oakland Harbor. The Yerba Buena Tunnel opened, along with the rest of the Bay Bridge, on November 12, 1936. As of 2019,
994-602: A former U.S. Congressman from California, traveled to Washington to help persuade President Herbert Hoover and the Reconstruction Finance Corporation to advance $ 62 million to build the bridge. Before work began, 12 massive underwater telephone cables were moved 1,000 feet (300 m) of the proposed bridge route by crews of the Pacific Telephone and Telegraph Co. during the summer of 1931. Construction began on July 9, 1933 after
1136-416: A groundbreaking ceremony attended by former president Herbert Hoover , dignitaries, and local beauty queens. The western section of the bridge between San Francisco and Yerba Buena Island presented an enormous engineering challenge. The bay was up to 100 feet (30 m) deep in places and the soil required new foundation-laying techniques. A single main suspension span some 4,100 feet (1.2 km) in length
1278-1022: A hotspot for polybrominated diphenyl ether ( PBDE ) flame retardants used to make upholstered furniture and infant care items less flammable. PBDEs have been largely phased out and replaced with alternative phosphate flame retardants. A 2019 San Francisco Estuary Institute (SFEI) study assayed a wide range of these newer flame retardant chemicals in Bay waters, bivalve California mussels ( Mytilus californianus ), and harbor seals ( Phoca vitulina ) which haul out in Corkscrew Slough on Bair Island in San Mateo County , with phosphate flame retardant contaminants such as tris(1,3-dichloro-2-propyl)phosphate (TDCPP) and triphenyl phosphate (TPhP) found at levels comparable to thresholds for aquatic toxicity. Thousands of man-made chemicals are found in Bay water, sediment, and organisms. For many of these, there
1420-699: A law, effective in 1929, to establish the California Toll Bridge Authority (Stats. 1929, Chap 763) and to authorize it and the State Department of Public Works to build a bridge connecting San Francisco and Alameda County (Stats. 1929, Chap 762). The state appointed a commission to evaluate the idea and various designs for a bridge across the Bay, the Hoover-Young Commission . Its conclusions were made public in 1930. In January 1931, Charles H. Purcell ,
1562-475: A license plate is called an image toll and can be identified on the customer statement by noticing the license plate number listed instead of the transponder number. If one fails to correctly list license plates on their account, the FasTrak customer will receive toll violation notices as if they were another driver. If a FasTrak customer receives a toll violation notice under these circumstances, they only refer to
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#17327653812551704-545: A major seaport . The Port of Oakland is one of the largest cargo ports in the United States, while the Port of Richmond and the Port of San Francisco provide smaller services. An additional crossing south of the Bay Bridge has long been proposed. San Francisco Bay is popular for sailors (boats, as well as windsurfing and kitesurfing ), due to consistent strong westerly/northwesterly thermally-generated winds – Beaufort force 6 (15–25 knots; 17–29 mph; 8–13 m/s)
1846-400: A natural mid-bay outcropping inside San Francisco city limits. The western crossing between Yerba Buena and downtown San Francisco has two complete suspension spans connected at a center anchorage. Rincon Hill is the western anchorage and touch-down for the San Francisco landing of the bridge connected by three shorter truss spans. The eastern crossing, between Yerba Buena Island and Oakland,
1988-587: A new transbay terminal located in the same vicinity in San Francisco, the Salesforce Transit Center . San Francisco Bay San Francisco Bay is a large tidal estuary in the U.S. state of California , and gives its name to the San Francisco Bay Area . It is dominated by the cities of San Francisco , San Jose , and Oakland . San Francisco Bay drains water from approximately 40 percent of California. Water from
2130-542: A packaged FasTrak transponder sold over-the-counter at a retail setting, such as nearby Costco locations. Customers must still register their transponders with the issuing agency. A 2008 teardown analysis of the Fastrak transponder and analysis of its security issues was published by Root Labs, finding that they are updated remotely and do not use encryption. Furthermore, FasTrak's basic functionality and specifications are listed under Title 21, Division 2, Chapter 16 of
2272-556: A project which created the artificial Treasure Island . The contract to build the Yerba Buena Cable Anchorage, Tunnel & Viaduct segment was opened for bids on March 28, 1933, and awarded to the low bidder, Clinton Construction Company of California, for $ 1,821,129.50 (equivalent to $ 34 million in 2023). Yerba Buena Island was the main site of the official groundbreaking for the Bay Bridge on July 9, 1933, when President Franklin D. Roosevelt remotely set off
2414-533: A safe eating advisory for fish caught in the San Francisco Bay based on levels of mercury or PCBs found in local species. The San Francisco Bay Area Water Trail is a planned system of designated trailheads designed to improve non-motorized small boat access to the bay. The California Coastal Conservancy approved funding in March 2011 to begin implementation of the water trail. FasTrak FasTrak
2556-424: A single arch-shaped bore (in cross-section), and the tunnel roof was constructed using 16-inch (410 mm) steel I-beam ribs spaced 3 feet (0.91 m) apart to support the rock, which were then embedded in concrete up to 3 feet (0.91 m) thick at the crown. No cave-ins occurred during the excavation of the tunnel. After the roof was completed, the remaining core of rock between the tunnel roof and lower deck
2698-479: A sticker transponder to replace the former plastic transponder. The sticker transponder is similar to the eGo Plus toll sticker introduced by TxTag in 2005, SunPass Mini toll sticker introduced by SunPass in 2008, and the sticker tag introduced by MnPASS in 2015. All eight toll bridges only collect tolls in one direction. All other toll facilities collect tolls in either direction, though some express lanes exist in only one direction of their freeway in parts or
2840-570: A stop was opened at Yerba Buena Island to serve expanded wartime needs on adjacent Treasure Island. Despite the vital role the railroad played, the last train went over the bridge in April 1958. The tracks were removed and replaced with pavement on the Transbay Terminal ramps and Bay Bridge. The Key System handled buses over the bridge until 1960 when its successor, AC Transit , took over operations. It still handles service today, running to
2982-401: A vehicle does not have a transponder, or if a transponder is not detected at the toll plaza, a violation enforcement system triggers cameras that capture photos of the vehicle and its license plate for processing. If the license plate is registered as belonging to a FasTrak user, the account is debited only the toll charge, and no penalty is charged, but no HOV discounts that would have required
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#17327653812553124-560: A widespread distribution in the bay, with uptake in the bay's phytoplankton and contamination of its sportfish. In January 1971, two Standard Oil tankers collided in the bay, creating an 800,000-U.S.-gallon (3,000,000-liter) oil spill disaster , which spurred environmental protection of the bay. In November 2007, a ship named COSCO Busan collided with the San Francisco–Oakland Bay Bridge and spilled over 58,000 U.S. gallons (220,000 liters) of bunker fuel , creating
3266-414: Is 76 feet (23 m) wide and 58 feet (18 m) high overall, and the dimensions of the tunnel interior are 66 feet (20 m) wide and 53 feet (16 m) high. In 1936, it was hailed as the world's largest-bore tunnel. The cross-sectional area of the upper half is 1,500 square feet (140 m), and the lower half is 1,000 square feet (93 m). Reminders of the long-gone bridge railway survive along
3408-489: Is common on summer afternoons – and protection from large open ocean swells. Yachting and yacht racing are popular pastimes and the San Francisco Bay Area is home to many of the world's top sailors. A shoreline bicycle and pedestrian trail known as the San Francisco Bay Trail encircles the edge of the bay. The San Francisco Bay Area Water Trail , a growing network of launching and landing sites around
3550-516: Is in line with the U.S. Department of Transportation's Intelligent Transportation Systems initiative. California's toll facilities are decentralized and operated by various local public agencies and special-purpose districts instead of having them all directly under the California Department of Transportation (Caltrans) or another state government agency. Concerned that they would each introduce different, incompatible ETC systems,
3692-433: Is little or no data on their impacts on the environment or human health, and they are not regulated by state or federal law. These are often referred to as "contaminants of emerging concern." The San Francisco Estuary Institute has studied these chemicals in the Bay since 2001. Scientists have identified the following most likely to have a negative impact on Bay wildlife: San Francisco Bay's profile changed dramatically in
3834-543: Is now called Drakes Bay . At the time, Drakes Bay went by the name Bahia de San Francisco and thus both bodies of water became associated with the name. Eventually, the larger, more important body of water fully appropriated the name San Francisco Bay . The first European to enter the bay is believed to have been the Spanish explorer Juan de Ayala , who passed through the Golden Gate on August 5, 1775, in his ship
3976-609: Is shipped throughout the Western United States to bakeries, canneries, fisheries, cheese makers and other food industries and used to de-ice winter highways, clean kidney dialysis machines, for animal nutrition, and in many industries. Many companies have produced salt in the bay, with the Leslie Salt Company the largest private land owner in the Bay Area in the 1940s. Low-salinity salt ponds mirror
4118-686: Is the South Bay Expressway in San Diego County, but it uses unstaffed toll booths with cash machines that require exact change. Under MAP-21 , passed by the Federal government in 2012, all ETC facilities in the United States must reach some form of interoperability by October 1, 2016. In response, the California State Legislature passed Assembly Bill 493 in 2013, authorizing Caltrans and the state's various toll agencies to help develop compatible systems. However,
4260-568: Is the electronic toll collection (ETC) system used in the state of California in the United States. The system is used statewide on all of the toll roads , toll bridges , and high-occupancy toll lanes along the California Freeway and Expressway System . As with other ETC systems, FasTrak is designed to eliminate the need for cars to stop to pay at toll booths, thus decreasing the traffic congestion traditionally associated with toll roads . Its use of technology to improve transit
4402-609: The California Code of Regulations , and are thus freely accessible to the general public. FasTrak units are also used to generate 5-1-1 traffic data, using sensors and antennae placed across various freeways. In response, the Bay Area Metropolitan Transportation Commission stated that they would contact the vendors manufacturing the FasTrak equipment and transponders to "identify potential risks and corrective actions". As
San Francisco–Oakland Bay Bridge - Misplaced Pages Continue
4544-625: The California DMV , the Bay Area FasTrak center and Riverside County HOT express lanes also offer a special "FasTrak CAV" tag for those who qualify for those discounts on applicable toll facilities. Other toll agencies may instead offer a special account for registered clean air vehicles on their HOT express lanes. For the I-15 Express Lanes in San Diego County, SANDAG only offers the standard FasTrak transponder, and instead instructs drivers that they can "declare" that they are
4686-618: The California Highway Patrol to visually check to see if there are more or fewer people in the car than indicated on the transponder. For the convenience of their FasTrak customers in the Greater Los Angeles urban area who may also use the Metro ExpressLanes, TCA began offering switchable transponders in 2013, and the 91 Express Lanes followed suit by 2015. With the switchable transponders,
4828-673: The California State Legislature passed Senate Bill 1523 in 1990, requiring Caltrans to develop a statewide specification that all these toll agencies were required to meet. Three years later, Transportation Corridor Agencies opened the Foothill Toll Road in Orange County , implementing the statewide ETC system for the first time, and naming it FasTrak. The state continues to delegate the responsibility of selling and maintaining FasTrak accounts to
4970-472: The California gold rush days, with "Emperor" Joshua Norton famously advocating for it, but construction did not begin until 1933. Designed by Charles H. Purcell , and built by American Bridge Company , it opened on Thursday, November 12, 1936, six months before the Golden Gate Bridge . It originally carried automobile traffic on its upper deck, with trucks, cars, buses and commuter trains on
5112-534: The Carquinez Bridge in 1996, it had accuracy problems in dealing with the 18 different toll classifications for different kinds of trucks. After the changes were made and another test run, the Carquinez Bridge became the first California toll bridge to use FasTrak in 1997. However, bureaucratic inaction, technical difficulties, and financial mismanagement delayed the deployment of the system to
5254-520: The Departments of War , Navy , and Commerce . The state applied for permits from the 3 federal departments as required. The permits were granted in January 1932, and formally presented in a ceremony on Yerba Buena Island on February 24, 1932. On May 25, 1931, Governor James Rolph Jr. signed into law two acts: one providing for the financing of state bridges by revenue bonds, and another creating
5396-739: The Dumbarton Rail Bridge , the first bridge crossing San Francisco Bay. The first automobile crossing was the Dumbarton Bridge , completed in January 1927. More crossings were later constructed – the Carquinez Bridge in May 1927, the San Francisco–Oakland Bay Bridge in 1936, the Golden Gate Bridge in 1937, the Richmond–San Rafael Bridge in 1956, and the San Mateo–Hayward Bridge in 1967. During
5538-569: The George Washington Bridge had a longer span between towers. As part of the celebration a United States commemorative coin was produced by the San Francisco Mint . A half dollar , the obverse portrays California's symbol, the grizzly bear , while the reverse presents a picture of the bridge spanning the bay. A total of 71,369 coins were sold, some from the bridge's tollbooths. The Yerba Buena passage utilizes
5680-633: The Kamchatka Peninsula and Japan. Recent genetic studies show that there is a local stock from San Francisco to the Russian River and that eastern Pacific coastal populations rarely migrate far, unlike western Atlantic Harbor porpoise. The common bottlenose dolphin ( Tursiops truncatus ) has been extending its current range northwards from the Southern California Bight . The first coastal bottlenose dolphin in
5822-518: The MacArthur Maze interchange at the east end of the bridge onto the three feeder highways, Interstate 580 , Interstate 880 , and I-80 toward Richmond . Since the number of lanes on the eastbound approach from San Francisco is structurally restricted, eastbound backups are also frequent during evening commute hours. The eastbound bottleneck is not the bridge itself, but the approach, which has just three lanes in each direction, in contrast to
San Francisco–Oakland Bay Bridge - Misplaced Pages Continue
5964-659: The Russian–American Company entered San Francisco Bay in 1807 and again over 1810–1811. Led by the Russian Timofei Nikitich Tarakanov , these hunting raids probably wiped out sea otters in the bay. Thousands of sea otter skins were taken to Sitka, then Guangzhou (Canton), China, where they commanded a high price. The United States seized the region from Mexico during the Mexican–American War (1846–1848). On February 2, 1848,
6106-718: The Sacramento and San Joaquin rivers, and from the Sierra Nevada mountains, flow into Suisun Bay , which then travels through the Carquinez Strait to meet with the Napa River at the entrance to San Pablo Bay , which connects at its south end to San Francisco Bay. It then connects to the Pacific Ocean via the Golden Gate strait. However, this entire group of interconnected bays is often called
6248-521: The Sacramento–San Joaquin River Delta remain perhaps California's most important ecological habitats . California's Dungeness crab , California halibut , and Pacific salmon fisheries rely on the bay as a nursery. The few remaining salt marshes now represent most of California's remaining salt marsh, supporting a number of endangered species and providing key ecosystem services such as filtering pollutants and sediments from
6390-548: The San Carlos and moored in a bay of Angel Island now known as Ayala Cove. Ayala continued to explore the San Francisco Bay Area and the expedition's cartographer, José de Cañizares, gathered the information necessary to produce the first map of the area. A number of place names survive (anglicized) from that first map, including Point Reyes , Angel Island , Farallon Islands , and Alcatraz Island . Alaskan Native sea otter hunters using Aleutian kayaks and working for
6532-497: The San Francisco Bay . The bay was designated a Ramsar Wetland of International Importance on February 2, 2013, and the Port of Oakland on the bay is one of the busiest cargo ports on the west coast. The bay covers somewhere between 400 and 1,600 square miles (1,000–4,000 km ), depending on which sub-bays (such as San Pablo Bay), estuaries, wetlands , and so on are included in the measurement. The main part of
6674-699: The Southern Pacific yard on trestles (some of it is still standing and visible from nearby roadways) onto the streets and dedicated right-of-ways in Berkeley, Albany, Oakland and Alameda. The Sacramento Northern and Key System tracks went under the SP tracks through a tunnel (which still exists and is in use as an access to the EBMUD treatment plant) and onto 40th St. Due to falling ridership, Sacramento Northern and IER service ended in 1941. On September 13, 1942,
6816-608: The USPS , based on the license plate of the car per Department of Motor Vehicle records. Metering signals are about 1,000 feet (300 m) west of the toll plaza. Two full-time bus-only lanes bypass the toll booths and metering lights around the right (north) side of the toll plaza; other high occupancy vehicles can use these lanes during weekday morning and afternoon commute periods. The two far-left toll lanes are high-occupancy vehicle lanes during weekday commute periods. Radio and television traffic reports will often refer to congestion at
6958-561: The Yerba Buena Tunnel , also known as the Yerba Buena Island Tunnel . The tunnel is 76 feet (23 m) wide, 58 feet (18 m) high, and 540 feet (160 m) long. It is the largest diameter transportation bore tunnel in the world. The large amount of material that was excavated in boring the tunnel was used for a portion of the landfill over the shoals lying adjacent to Yerba Buena Island to its north,
7100-552: The 20th century, the bay was subject to the 1940s Reber Plan , which would have filled in parts of the bay in order to increase industrial activity along the waterfront. In 1959, the United States Army Corps of Engineers released a report stating that if current infill trends continued, the bay would be as big as a shipping channel by 2020. This news created the Save the Bay movement in 1960, which mobilized to stop
7242-643: The Bay Area FasTrak Customer Center or from Transportation Corridor Agencies can be used at the airport. When the Metro ExpressLanes opened in Los Angeles in late 2012, it introduced FasTrak transponders with a special switch that indicates the number of occupants (1, 2, or 3 or more) in the vehicle. This enables the open road tolling system to automatically compute the carpool or solo driver toll, as well as allow
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#17327653812557384-547: The Bay Area in recent times was spotted in 1983 off the San Mateo County coast in 1983. In 2001, bottlenose dolphins were first spotted east of the Golden Gate Bridge and confirmed by photographic evidence in 2007. Zooarcheological remains of bottlenose dolphins indicated that bottlenose dolphins inhabited San Francisco Bay in prehistoric times until at least 700 years before present, and dolphin skulls dredged from
7526-400: The Bay Bridge was part of the upper deck lining in late summer 1936. This included the emplacement of regularly spaced refuge bays ("deadman holes") along the south wall of the lower deck tunnel, escape alcoves common in all railway tunnels into which track maintenance workers could duck if a train came along. These remain and are visible to eastbound motorists today. The completed tunnel bore
7668-493: The Bay Bridge, including the construction of the Yerba Buena Tunnel. Before starting excavation, the ground through which the western half of the tunnel would be bored was stabilized by injecting cement grout under pressure through 25 1.5-inch (38 mm) holes bored into the loose rock over the crown of the tunnel. After excavating the western and eastern open portals, three drifts were bored from west to east along
7810-516: The Board of Supervisors, in which compromise with the Central Pacific was recommended; also the bridging of the bay at Ravenswood and the granting of railroad facilities at Mission Bay and on the water front. Wm. C. Ralston, ex-Mayor Selby and James Otis were on this committee. A daily newspaper attempts to account for the advice of these gentlemen to the city by hinting that they were afraid of
7952-606: The FasTrak system to the two other toll roads they administer as soon as they opened: the San Joaquin Hills Toll Road in 1996 and the Eastern Toll Road in 1998. Also in 1998, the system was then deployed on the high-occupancy toll (HOT) lanes along Interstate 15 in San Diego . However, the system had to be modified so that it could be used on California's toll bridges. After a test run on
8094-663: The Federal government in 2012, all ETC facilities in the United States were supposed to reach some form of interoperability in 2016. However, neither penalties nor funding was attached to MAP-21, and therefore California did not meet the deadline. State regulators later approved a phase-in of transponder technology using the ISO/IEC 18000 -63 (6C) standard, which began in 2018 and is expected to end in 2024. This would allow compatibility with systems used in nearby states of Washington, Colorado, and Utah; and also Kentucky, Indiana, Georgia, North Carolina, and Louisiana, plus NationalPass . If
8236-626: The HOT lanes in San Diego, drivers can "declare" that they are a carpool (and thus do not have to pay a toll) by covering their FasTrak transponder in a mylar bag. There has been a push to strictly use open road tolling , accepting only payments via a FasTrak transponder, a toll-by-plate account, or one-time payments via online or by phone instead of cash. All of California's HOT lanes only use open road tolling. The Golden Gate Bridge began requiring electronic payments for all tolls in March 2013, and all
8378-453: The Mexican province of Alta California was annexed to the United States with the signing of the Treaty of Guadalupe Hidalgo . A year and a half later, California requested to join the United States on December 3, 1849, and was accepted as the 31st State of the Union on September 9, 1850. In 1921, a tablet was dedicated by a group of men in downtown San Francisco, marking the site of the original shoreline. The tablet reads: "This tablet marks
8520-443: The Orange County toll roads run by TCA likewise did the same in May 2014. A plan to also eliminate toll takers on all seven of the state-owned bridges was approved in 2019. On March 20, 2020, at midnight, due to the COVID-19 pandemic , all-electronic tolling was temporarily placed in effect for those seven state-owned toll bridges, and since 2021, all of them are now permanently cashless. The only toll facility that still accepts cash
8662-420: The Pleistocene in accordance with sea level changes caused by glacial advances and retreats. During the Wisconsin Glaciation , between 15,000 and about 10,000 years ago, the basin which is now filled by the San Francisco Bay was a large river valley with small hills, channeling the Sacramento River through the Golden Gate Strait into the ocean. When the great ice sheets began to melt, around 11,000 years ago,
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#17327653812558804-425: The Port of Oakland. Some six million cubic yards (160 million cubic feet; 4.6 million cubic meters) of mud from the dredging was deposited at the western edge of Middle Harbor Shoreline Park to become a 188-acre (0.294 sq mi; 0.76 km ) shallow-water wetlands habitat for marine and shore life. Further dredging followed in 2011, to maintain the navigation channel. This dredging enabled
8946-487: The San Francisco entrance to the bridge, was jammed with a slowly moving auto caravan. Every available policeman in the department was called to duty to aid in regulating the city's greatest parade of autos. One of the greatest traffic congestions of the evening was at Fifth and Mission Streets, with downtown traffic and bridge-bound traffic snarled in an almost hopeless mass. To add to the confusion, traffic signals jammed and did not synchronize. Police reported that there
9088-438: The San Francisco–Oakland Bay Bridge Division of the State Department of Public Works. On September 15, 1931, this new division opened its offices at 500 Sansome Street in San Francisco. During 1931, numerous aerial photographs were taken of the chosen route for the bridge and its approaches. That year, engineers had not determined the final design concept for the western span between San Francisco and Yerba Buena Island, although
9230-402: The State Highway Engineer of California, who had also served as the secretary of the Hoover-Young Commission, assumed the position of Chief Engineer for the Bay Bridge. Glenn B. Woodruff served as design engineer for the project. He explained in a 1936 article that several elements of the bridge required not only new designs, but also new theories of design. To make the bridge feasible, a route
9372-431: The arrival of Europeans. Indigenous peoples used canoes to fish and clam along the shoreline. Sailing ships enabled transportation between the bay and other parts of the world—and served as ferries and freighters within the bay and between the bay and inland ports, such as Sacramento and Stockton. These were gradually replaced by steam-powered vessels starting in the late 19th century. Several shipyards were established around
9514-431: The arrival of the largest container ship ever to enter the San Francisco Bay, the MSC Fabiola . Bay pilots trained for the visit on a simulator at the California Maritime Academy for over a year. The ship arrived drawing less than its full draft of 50 feet 10 inches (15.5 m) because it held only three-quarters of a load after its stop in Long Beach. San Francisco Bay was traversed by watercraft before
9656-401: The average depth of the bay is only as deep as a swimming pool—approximately 12 to 15 ft (4–5 m). Between Hayward and San Mateo to San Jose it is 12 to 36 in (30–90 cm). The deepest part of the bay is under and out of the Golden Gate Bridge, at 372 ft (113 m). In the late 1990s, a 12-year harbor-deepening project for the Port of Oakland began; it
9798-427: The bay and converting them back to wetlands. The idea was, and remains, controversial. ( For further details, see the " Bay fill and depth profile " section. ) There are five large islands in San Francisco Bay. Alameda , the largest island, was created when a shipping lane was cut to form the Port of Oakland in 1901. It is now a suburban community. Angel Island was known as " Ellis Island West" because it served as
9940-533: The bay for non-motorized small boat users (such as kayakers) is being developed. Parks and protected areas around the bay include Eden Landing Ecological Reserve , Hayward Regional Shoreline , Don Edwards San Francisco Bay National Wildlife Refuge , Hayward Shoreline Interpretive Center , Crown Memorial State Beach , Eastshore State Park , Point Isabel Regional Shoreline , Brooks Island Regional Preserve , and César Chávez Park . The California Office of Environmental Health Hazard Assessment (OEHHA) has developed
10082-464: The bay measures three to twelve miles (5–19 km) wide east-to-west and somewhere between 48 miles (77 km) and 60 miles (97 km) north-to-south. San Francisco Bay is the second-largest estuary on the Pacific coast of the Americas, following the Salish Sea in Washington State and British Columbia, Canada. The bay was navigable as far south as San Jose until the 1850s, when hydraulic mining released massive amounts of sediment from
10224-522: The bay perimeter. San Francisco Bay provided the nation's first wildlife refuge, Oakland's artificial Lake Merritt , constructed in the 1860s, and America's first urban National Wildlife Refuge, the Don Edwards San Francisco Bay National Wildlife Refuge (SFBNWR) in 1972. The bay is also plagued by non-native species. Salt produced from San Francisco Bay is produced in salt evaporation ponds and
10366-417: The bay suggest occasional visitors in historic times. San Francisco Bay faces many of the same water quality issues as other urban waterways in industrialized countries, or downstream of intensive agriculture. According to state water quality regulators, San Francisco Bay waters do not meet water quality standards for the following pollutants: Industrial, mining, and other uses of mercury have resulted in
10508-409: The bay to Oakland was spanned by a 10,176-foot (3.102 km) combination of double cantilever, five long-span through-trusses, and a truss causeway, forming the longest bridge of its kind at the time. The cantilever section was longest in the nation and third-longest anywhere. Much of the original eastern section was founded upon treated wood pilings. Because of the very deep mud on the bay bottom, it
10650-481: The bay, augmented during wartime (e.g., the Kaiser Shipyards , Richmond Shipyards ) near Richmond in 1940 for World War II for construction of mass-produced, assembly line Liberty and Victory cargo ships . San Francisco Bay is spanned by nine bridges, eight of which carry cars . The Transbay Tube , an underwater rail tunnel, carries BART services between Oakland and San Francisco. Prior to
10792-454: The bridge's five. The western section of the Bay Bridge is currently restricted to motorized freeway traffic. Pedestrians, bicycles, and other non-freeway vehicles are not allowed to cross this section. A project to add bicycle/pedestrian lanes to the western section has been proposed but is not finalized. A Caltrans bicycle shuttle operates between Oakland and San Francisco during peak commute hours for $ 1.00 each way. Freeway ramps next to
10934-516: The bridge. The tracks left the lower deck in San Francisco just southwest of the end of 1st St. They then went along an elevated viaduct above city streets, looping around and into the terminal on its east end. Departing trains exited on the loop back onto the bridge. The loop continued to be used by buses until the terminal's closure in 2010. The tracks left the lower deck in Oakland. The Interurban Electric Railway tracks ran along Engineer Road and over
11076-673: The bridges and, later, the Transbay Tube, transbay transportation was dominated by fleets of ferryboats operated by the Southern Pacific Railroad and the Key System transit company. However, in recent decades, ferries have returned, primarily serving commuters from Marin County, relieving the traffic bottleneck of the Golden Gate Bridge (see Ferries of San Francisco Bay ). The bay also continues to serve as
11218-522: The center of the bay is Alcatraz , the site of the famous federal penitentiary. The federal prison on Alcatraz Island no longer functions, but the complex is a popular tourist site. Despite its name, Mare Island in the northern part of the bay is a peninsula rather than an island. San Francisco Bay is thought to represent a down-warping of the Earth's crust between the San Andreas Fault to
11360-541: The center of the bay, following the ancient drowned river valley. In the 1860s and continuing into the early 20th century, miners dumped staggering quantities of mud and gravel from hydraulic mining operations into the upper Sacramento and San Joaquin Rivers. GK Gilbert's estimates of debris total more than eight times the amount of rock and dirt moved during construction of the Panama Canal. This material flowed down
11502-635: The city would lose its position as the regional center of trade. Businessmen had considered the concept of a bridge spanning the San Francisco Bay since the Gold Rush days. During the 1870s, several newspaper articles explored the idea. In early 1872, a "Bay Bridge Committee" was hard at work on plans to construct a railroad bridge. The April 1872 issue of the San Francisco Real Estate Circular reported on this committee: The Bay Bridge Committee lately submitted its report to
11644-479: The deadline, which had neither penalty nor funding attached, was not met. California regulators later approved a phase-in of transponder technology using the ISO/IEC 18000 -63 (6C) standard, released in 2004, which began in 2018 and is expected to end in 2024. This would allow compatibility with systems used in nearby states of Washington, Colorado, and Utah; and also Kentucky, Indiana, Georgia, North Carolina, and Louisiana, plus NationalPass . In 2019, TCA introduced
11786-459: The decades surrounding 1900, at the behest of local political officials and following Congressional orders, the U.S. Army Corps began dredging the Sacramento and San Joaquin Rivers and the deep channels of San Francisco Bay. This work has continued without interruption ever since. Some of the dredge spoils were initially dumped in the bay shallows (including helping to create Treasure Island on
11928-435: The different toll agencies. Under California law, Caltrans was given the mandate to develop and maintain an open, statewide ETC specification. This specification became known in the transportation industry as "Title 21" after it was added to Title 21 of the California Code of Regulations . It uses RFID technology near 915 MHz to read data from a transponder placed in a vehicle (usually mounted by Velcro strips to
12070-419: The ecosystem of the bay, with fish and fish-eating birds in abundance. Mid-salinity ponds support dense populations of brine shrimp , which provide a rich food source for millions of shorebirds. Only salt-tolerant micro-algae survive in the high salinity ponds, and impart a deep red color to these ponds from the pigment within the algae protoplasm. The salt marsh harvest mouse is an endangered species endemic to
12212-449: The edges of the bay were, for many years, considered wasted space. As a result, soil excavated for building projects or dredged from channels was often dumped onto the wetlands and other parts of the bay as landfill. From the mid-19th century through the late 20th century, more than a third of the original bay was filled and often built on. The deep, damp soil in these areas is subject to soil liquefaction during earthquakes, and most of
12354-660: The electric interurban trains started in revenue service, running along the south side of the lower deck of the bridge. The terminal originally was supposed to open at the same time as the Bay Bridge, but had been delayed. Trains over the Bridge Railway were operated by the Sacramento Northern Railroad ( Western Pacific ), the Interurban Electric Railway ( Southern Pacific ) and the Key System . Freight trains never used
12496-470: The entrance to the bay, San Francisco was well placed to prosper during the California Gold Rush . Almost all goods not produced locally arrived by ship, as did numerous travelers and erstwhile miners. But after the first transcontinental railroad was completed in May 1869, San Francisco was on the wrong side of the Bay, and separated from the new rail link. Many San Franciscans feared that
12638-539: The entry point for immigrants from East Asia. It is now a state park accessible by ferry. Mountainous Yerba Buena Island is pierced by a tunnel linking the east and west spans of the San Francisco–Oakland Bay Bridge . Attached to the north is the artificial and flat Treasure Island , site of the 1939 Golden Gate International Exposition . From the Second World War until the 1990s, both islands served as military bases and are now being redeveloped. Isolated in
12780-399: The first California toll facility to use an ETC system. Transportation Corridor Agencies (TCA), the local agency in charge of the toll road, named the system "FasTrak". To this day, TCA still holds the trademark to the "FasTrak" name and logo. When TCA first introduced the FasTrak system, the electronic transponders consisted of a gadget about the size of a Walkman in which a smart card
12922-610: The first ETC system in North America was installed on the Dallas North Tollway in 1989, many California toll facilities started to express interest in the technology. Because the state's toll roads and bridges are run by different government agencies, there was the possibility that a number of different incompatible ETC systems would be instituted throughout California. Therefore, the California State Legislature passed Senate Bill 1523 in 1990, requiring Caltrans ,
13064-479: The first time in 65 years, Pacific Harbor Porpoise ( Phocoena phocoena ) returned to the bay in 2009. Golden Gate Cetacean Research, a non-profit organization focused on research on cetaceans , has developed a photo-identification database enabling the scientists to identify specific porpoise individuals and is trying to ascertain whether a healthier bay has brought their return. Pacific harbor porpoise range from Point Conception , California, to Alaska and across to
13206-554: The former US president Herbert Hoover , Senator William G. McAdoo , and the Governor of California , Frank Merriam . Governor Merriam opened the bridge by cutting gold chains across it with an acetylene cutting torch . The San Francisco Chronicle report of November 13, 1936, read: the greatest traffic jam in the history of S.F., a dozen old-fashioned New Year's eves thrown into one – the biggest and most good-natured crowd of tens of thousands ever to try and walk
13348-561: The former shoals to the north of Yerba Buena Island ) and used to raise islands in the Sacramento-San Joaquin Delta. The net effect of dredging has been to maintain a narrow deep channel—deeper perhaps than the original bay channel—through a much shallower bay. At the same time, most of the marsh areas have been filled or blocked off from the bay by dikes . Large ships transiting the bay must follow deep underwater channels that are maintained by frequent dredging as
13490-431: The idea of a double-span suspension bridge was already favored. In April 1932, the preliminary final plan and design of the bridge was presented by Chief Engineer Charles Purcell to Col. Walter E. Garrison, Director of the State Department of Public Works, and to Ralph Modjeski , head of the Board of Engineering Consultants. Both agencies approved and preparation of the final design proceeded. In 1932, Joseph R. Knowland ,
13632-503: The infill of wetlands and the bay in general, which had shrunk to two-thirds of its size in the century before 1961. The San Francisco Bay continues to support some of the densest industrial production and urban settlement in the United States. The San Francisco Bay Area is the American West's second-largest urban area, with approximately seven million residents. Despite its urban and industrial character, San Francisco Bay and
13774-486: The island's rocky central hill, another 790.8-foot (241.0 m) concrete viaduct, and a longer curved high-level steel truss viaduct that spans the final 1,169.7 feet (356.5 m) to the cantilever bridge. The toll plaza on the Oakland side (westbound traffic only since 1969) has eighteen toll lanes, with all charges now made either through the FasTrak electronic toll collection system or through invoices mailed through
13916-482: The largest oil spill in the region since 1996. The bay also has some of the highest levels of dissolved inorganic nitrogen known from any coastal water body, mostly originating from treated wastewater from Publicly owned treatment works . In other bays, such nutrient levels would likely lead to eutrophication , but historically, the bay has had less harmful algal blooms than other water bodies with similar nutrient concentrations. Potential explanations have included
14058-561: The late 19th century and again with the initiation of dredging by the US Army Corps of Engineers in the 20th century. Before about 1860, most bay shores (with the exception of rocky shores, such as those in Carquinez Strait; along Marin shoreline; Point Richmond; Golden Gate area) contained extensive wetlands that graded nearly invisibly from freshwater wetlands to salt marsh and then tidal mudflat. A deep channel ran through
14200-487: The lower, but after the Key System abandoned its rail service on April 20, 1958, the lower deck was converted to all-road traffic as well. On October 12, 1963, traffic was reconfigured to one way traffic on each deck, westbound on the upper deck, and eastbound on the lower deck, with trucks and buses also allowed on the upper deck. In 1986, the bridge was unofficially dedicated to former California governor James Rolph . The bridge has two sections of roughly equal length;
14342-677: The major damage close to the bay in the Loma Prieta earthquake of 1989 occurred to structures on these areas. The Marina District of San Francisco, hard hit by the 1989 earthquake, was built on fill that had been placed there for the Panama-Pacific International Exposition , although liquefaction did not occur on a large scale. In the 1990s, San Francisco International Airport proposed filling in hundreds more acres to extend its overcrowded international runways in exchange for purchasing other parts of
14484-484: The new eastern section opened September 2, 2013, at a reported cost of over $ 6.5 billion; the original estimate of $ 250 million was for a seismic retrofit of the existing span. Unlike the western section and the original eastern section of the bridge, the new eastern section is a single deck carrying all eastbound and westbound lanes. Demolition of the old east span was completed on September 8, 2018. The bridge consists of two crossings, east and west of Yerba Buena Island ,
14626-489: The old coastline, and Potato Patch Shoal is an area of sand dunes now covered by the ocean. The indigenous inhabitants of the San Francisco Bay are Ohlone . The first European to see San Francisco Bay is likely N. de Morena who was left at New Albion at Drakes Bay in Marin County, California , by Sir Francis Drake in 1579 and then walked to Mexico. The first recorded European discovery of San Francisco Bay
14768-453: The older western section, officially known as the Willie L. Brown Jr. Bridge (after former San Francisco Mayor and California State Assembly Speaker Willie L. Brown Jr. ), connects downtown San Francisco to Yerba Buena Island , and the newer east bay section connects the island to Oakland. The western section is a double suspension bridge with two decks, westbound traffic being carried on
14910-458: The open road tolling system to automatically compute the carpool or solo driver toll. The Bay Area toll bridges and the 91 Express Lanes instead have designated carpool lanes , so any tag type can be used (although both the 91 Express Lanes and TCA agencies also offer the switchable FasTrak Flex tags to its users if they want to use the Los Angeles or Riverside County express lanes too). For eligible clean air vehicles (CAVs) registered with
15052-536: The other six state-run toll bridges in the San Francisco Bay Area until October 2000. Meanwhile, the Golden Gate Bridge , run by the independent Golden Gate Bridge, Highway and Transportation District , installed their system a few months earlier in July of that year. The FasTrak system was also briefly used on the state-owned San Diego-Coronado Bridge until tolls were discontinued on that structure in 2002. The Bay Area FasTrak Customer Center then opened in 2005, merging
15194-428: The path of the tunnel: one at the crown and the other two at the lower corners. The first drift broke through in July 1934, approximately one year after the start of construction. A ceremonial party led by Governor Merriam celebrated the completion of the first 12-foot-square (3.7 m) drift on July 24 by walking through it, followed by a short speech. The space between the three drifts was then excavated, resulting in
15336-416: The presence of intensive "top-down control" from grazing clams like Potamocorbula , high sediment supply limiting light availability for the algae, and intensive tidal mixing. The occurrence of an unprecedented harmful algal bloom of Heterosigma akashiwo in 2022, resulting in mass fish deaths and anoxia, suggests that the mechanisms of control on algal growth may be eroding. The bay was once considered
15478-503: The railroad company, and therefore made their recommendations to suit its interests. The self-proclaimed Emperor Norton decreed three times in 1872 that a suspension bridge be constructed to connect Oakland with San Francisco. In the third of these decrees, in September 1872, Norton, frustrated that nothing had happened, proclaimed: WHEREAS, we issued our decree ordering the citizens of San Francisco and Oakland to appropriate funds for
15620-539: The reverse side of the Toll Violation notice and complete the section at the bottom of the notice that will add the new vehicle to their account. Conversely, a license plate should be removed from an account after a change in ownership, otherwise resulting in paying for another driver's tolls via the Image Toll process. The California Toll Operators Committee (CTOC) helps coordinates the interoperability among
15762-405: The rivers that settled in those parts of the bay that had little or no current. Later, wetlands and inlets were deliberately filled in, reducing the bay's size since the mid-19th century by as much as one third. Recently, large areas of wetlands have been restored, further confusing the issue of the bay's size. Despite its value as a waterway and harbor , many thousands of acres of marshy wetlands at
15904-463: The rivers, progressively eroding into finer and finer sediment, until it reached the bay system. Here some of it settled, eventually filling in Suisun Bay, San Pablo Bay, and San Francisco Bay, in decreasing order of severity. By the end of the 19th century, these " slickens " had filled in much of the shallow bay flats, raising the entire bay profile. New marshes were created in some areas. In
16046-838: The rivers. San Francisco Bay is recognized for protection by the California Bays and Estuaries Policy , with oversight provided by the San Francisco Estuary Partnership . Most famously, the bay is a key link in the Pacific Flyway . Millions of waterfowl annually use the bay shallows as a refuge. Two endangered species of birds are found here: the California least tern and the Ridgway's Rail . Exposed bay muds provide important feeding areas for shorebirds , but underlying layers of bay mud pose geological hazards for structures near many parts of
16188-678: The same functionality as a standard one. For those traveling on the HOT express lanes in the Bay Area, in Riverside County, in San Bernardino County, or the Los Angeles Metro ExpressLanes and want the carpooling discounts, they will need a switchable "FasTrak Flex" transponder. These devices include a switch that indicates the number of occupants (1, 2, or 3 or more) in the vehicle. This enables
16330-568: The sea level started to rise rapidly, by about 1 inch per year. Melting glaciers in the Sierra Nevada washed huge amounts of sediment down the Sacramento and San Joaquin rivers, which accumulated on the shores of the bay, forming huge mudflats and marshes that supported local wildlife. By 5000 BC the sea level rose 300 feet (90 m), filling the valley with water from the Pacific. The Farallon Islands are what used to be hills along
16472-620: The service center for the state's Bay Area bridges with the one that was being operated separately by the Golden Gate Bridge District. Since then, several other new toll facilities around California have either opened, are under construction, or are in the planning stages. They are all required to accept FasTrak as per the aforementioned state law. In 2009, San Francisco International Airport began accepting FasTrak in all of its parking garages, including long-term parking. Currently only FasTrak accounts opened from either
16614-702: The shore line of San Francisco Bay at the time of the discovery of gold in California, January 24, 1848. Map reproduced above delineates old shore line. Placed by the Historic Landmarks committee, Native Sons of the Golden West , 1921." The bay became the center of American settlement and commerce in the Far West through most of the remainder of the 19th century. During the California Gold Rush (1848–1855), San Francisco Bay suddenly became one of
16756-410: The south side of the lower Yerba Buena Tunnel. These are the regularly spaced refuge bays ("deadman holes"), escape alcoves common in all railway tunnels, along the wall, into which track maintenance workers could safely retreat if a train came along. (The north side, which always carried only motor traffic, lacks these holes.) The bridge opened on November 12, 1936, at 12:30 p.m. In attendance were
16898-517: The state's Department of Transportation, to develop a statewide technical specification which all systems would be required to meet. As a result, California was the first in the nation to require all of its toll bridges and roads to use the same ETC system. This technical specification was later codified in Title 21, Division 2, Chapter 16 of the California Code of Regulations . When the Foothill Toll Road in Orange County opened in 1993, it became
17040-664: The state's toll agencies and facilities. The CTOC's members include: All toll facilities in the San Francisco Bay Area share the same billing, customer service center, and web site. In 2018, Transportation Corridor Agencies , operator of the Orange County toll roads, signed a long term agreement to be the processing partner for the San Bernardino County high-occupancy toll lanes. All the other toll agencies in Southern California have separate billing, customer service centers, and web sites. Anybody with
17182-426: The streets and guide their autos on them – This was the city last night, the night of the bridge opening with every auto owner in the bay region, seemingly, trying to crowd his machine onto the great bridge. And those who tried to view the brilliantly lighted structure from the hilltops and also view the fireworks display were numbered also in the thousands. Every intersection in the city, particularly those near
17324-632: The survey of a suspension bridge from Oakland Point via Goat Island; also for a tunnel; and to ascertain which is the best project; and whereas the said citizens have hitherto neglected to notice our said decree; and whereas we are determined our authority shall be fully respected; now, therefore, we do hereby command the arrest by the army of both the Boards of City Fathers if they persist in neglecting our decrees. Given under our royal hand and seal at San Francisco, this 17th day of September, 1872. Unlike most of Emperor Norton's eccentric ideas, his decree to build
17466-399: The toll plaza, metering lights, or a parking lot in the median of the road for bridge employees; the parking lot is about 1,900 feet (580 m) long, stretching from about 800 feet (240 m) east of the toll plaza to about 100 feet (30 m) west of the metering lights. During the morning commute hours, traffic congestion on the westbound approach from Oakland stretches back through
17608-538: The tunnel lacks an official name. Construction of the Bridge Railway began on November 29, 1937, with the laying of the first ties. The first train was run across the Bay Bridge on September 23, 1938, a test run utilizing a Key System train consisting of two articulated units with California Governor Frank Merriam at the controls. On January 14, 1939, the San Francisco Transbay Terminal was dedicated. The following morning, January 15, 1939,
17750-428: The tunnel provide access to Yerba Buena Island and Treasure Island . Because the toll plaza is on the Oakland side, the western span is a de facto non-tolled bridge; traffic between the island and the main part of San Francisco can freely cross back and forth. Those who only travel from Oakland to Yerba Buena Island, and not the entire length to the main part of San Francisco, still must pay the full toll. Developed at
17892-428: The upper deck while eastbound is carried on the lower one. The largest span of the original eastern section was a cantilever bridge . During the 1989 Loma Prieta earthquake , a portion of the eastern section's upper deck collapsed onto the lower deck and the bridge was closed for a month. Reconstruction of the eastern section of the bridge as a causeway connected to a self-anchored suspension bridge began in 2002;
18034-550: The vehicle license plates are properly listed, the violations will be sent to the registered owner and not the employee driver. It is for this reason that the License Agreement mandates that customers list all vehicles, including motorcycles, motor homes, and trailers of all types on their accounts so that when transponders fail to read the toll can be debited based upon the vehicle's license plate. A license plate may be listed only on one account. A toll collected based on
18176-403: The violation rate on the Metro ExpressLanes fell to 10 percent from the 20 to 25 percent cheating rate in toll lanes that do not require transponders for carpoolers, prompting Alameda County officials to include the system on the then-planned I-580 Express Lanes. The Bay Area FasTrak Customer Center then started to offer switchable transponders, under the name "FasTrak Flex", in summer 2015. For
18318-521: The west and the Hayward Fault to the east, though the precise nature of this remains under study. About 560,000 years ago, a tectonic shift caused the large inland Lake Corcoran to spill out the central valley and through the Carquinez Strait , carving out sediment and forming canyons in what is now the northern part of the San Francisco Bay and Golden Gate strait . San Francisco Bay has been filled and emptied of sea water many times during
18460-434: The wetlands of the San Francisco Bay with a high salt tolerance. It needs native pickleweed , which is often displaced by invasive cordgrass, for its habitat. The seasonal range of water temperature in the bay is from January's 53 °F (12 °C) to September's 60 °F (16 °C) when measured at Fort Point , which is near the southern end of the Golden Gate Bridge and at the entrance to San Francisco Bay. For
18602-406: The whole of their length. ^ indicates that carpools require the switchable "FasTrak Flex" transponder. HOV 2+ indicates that carpools require two or more persons. HOV 3+ indicates that carpools require three or more persons. † indicates that two-person carpools are tolled differently than solo drivers or carpools with three or more, typically at a rate intermediate between
18744-423: The windshield) moving at speeds that may exceed 70 mph (112 km/h). The RFID transponder in each vehicle is associated with a prepaid debit account; each time the vehicle passes underneath a toll collection site, the account is debited to pay the toll. FasTrak transponders using the Title 21 specifications are not compatible with E-ZPass and other ETC systems used in other states. Under MAP-21 , passed by
18886-493: The world's great seaports, dominating shipping in the American West until the last years of the 19th century. The bay's regional importance increased further when the first transcontinental railroad was connected to its western terminus at Alameda on September 6, 1869. The terminus was switched to the Oakland Long Wharf two months later on November 8, 1869. In 1910, the Southern Pacific railroad company built
19028-413: Was a cantilever bridge with a double-tower span, five medium truss spans, and a 14-section truss causeway . Due to earthquake concerns, the eastern crossing was replaced by a new crossing that opened on Labor Day 2013. On Yerba Buena Island, the double-decked crossing is a 321-foot (98 m) concrete viaduct east of the west span's cable anchorage, the 540-foot (160 m) Yerba Buena Tunnel through
19170-440: Was chosen via Yerba Buena Island , which would reduce both the material and the labor needed. Since Yerba Buena Island was a U.S. Navy base at the time, the state had to gain approval from Congress for this purpose as it regulates and controls all federal lands and the armed services . After a great deal of lobbying, California received Congressional approval to use the island on February 20, 1931, subject to final approvals by
19312-416: Was considered but rejected, as it would have required too much fill and reduced wharfage space at San Francisco, had less vertical clearance for shipping, and cost more than the design ultimately adopted. The solution was to construct a massive concrete anchorage halfway between San Francisco and the island, and to build a main suspension span on each side of this central anchorage. East of Yerba Buena Island,
19454-399: Was excavated using a power shovel. By May 1935, work on removing the core was progressing and 40 steel ribs had been placed; concrete embedment was just starting. Removal of the core was completed on November 18, 1935. Once the excavation was complete, the upper deck was placed and the interior ceiling above the upper deck was lined with tiles. The last concrete poured during the construction of
19596-431: Was inserted. However, the smart cards were unpopular with both tollway officials and users because they cost more, offered little advantage, and customers were charged with a $ 10 annual fee (which has since been discontinued). By the time the 91 Express Lanes opened in 1995, the FasTrak transponders were redesigned to be the size of a coaster that could be mounted by Velcro strips to the windshield. TCA later deployed
19738-697: Was largely completed by September 2009. Previously, the bay waters and harbor facilities only allowed for ships with a draft of 46 ft (14 m), but dredging activities undertaken by the United States Army Corps of Engineers in partnership with the Port of Oakland succeeded in providing access for vessels with a 50-foot (15 m) draft. Four dredging companies were employed in the US$ 432 ;million project, with $ 244 million paid for with federal funds and $ 188 million supplied by
19880-434: Was no lessening of the traffic over the bridge, all lanes being crowded with Oakland- or San-Francisco-bound machines far into the night. The total cost was US$ 77 million. Before opening the bridge was blessed by Cardinal Secretary of State Eugene Cardinal Pacelli , later Pope Pius XII . Because it was in effect two bridges strung together, the western spans were ranked the second and third largest suspension bridges . Only
20022-426: Was not practical to reach bedrock, although the lower levels of the mud are quite firm. Long wooden pilings were crafted from entire old-growth Douglas fir trees, which were driven through the soft mud to the firmer bottom layers. The construction project had casualties: twenty-four men would die while constructing the bridge. California Department of Transportation engineer C.H. Purcell served as chief engineer for
20164-409: Was on November 4, 1769, when Spanish explorer Gaspar de Portolá , unable to find the Port of Monterey , continued north close to what is now Pacifica and reached the summit of the 1,200-foot-high (370 m) Sweeney Ridge , now marked as the place where he first sighted San Francisco Bay. Portolá and his party did not realize what they had discovered, thinking they had arrived at a large arm of what
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