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122-566: When ground was broken for the Wrigley Building in 1920, there were no major office buildings north of the Chicago River . The Michigan Avenue Bridge, which spans the river just south of the building, was still under construction. The land was selected by chewing gum magnate William Wrigley Jr. for the headquarters of his company. The building was designed by the architectural firm of Graham, Anderson, Probst & White using

244-740: A flash lock . Pound locks were first used in China during the Song dynasty (960–1279 CE), having been pioneered by the Song politician and naval engineer Qiao Weiyue in 984. They replaced earlier double slipways that had caused trouble and are mentioned by the Chinese polymath Shen Kuo (1031–1095) in his book Dream Pool Essays (published in 1088), and fully described in the Chinese historical text Song Shi (compiled in 1345): The distance between

366-404: A river more easily navigable, or to allow a canal to cross land that is not level. Later canals used more and larger locks to allow a more direct route to be taken. A pound lock is most commonly used on canals and rivers today. A pound lock has a chamber with gates at both ends that control the level of water in the pound. In contrast, an earlier design with a single gate was known as

488-528: A broad canal for more than one boat to be in a staircase at the same time, but managing this without waste of water requires expertise. On English canals, a staircase of more than two chambers is usually staffed: the lockkeepers at Bingley (looking after both the "5-rise" and the "3-rise") ensure that there are no untoward events and that boats are moved through as speedily and efficiently as possible. Such expertise permits miracles of boat balletics: boats travelling in opposite directions can pass each other halfway up

610-426: A flight of locks is simply a series of locks in close-enough proximity to be identified as a single group. For many reasons, a flight of locks is preferable to the same number of locks spread more widely: crews are put ashore and picked up once, rather than multiple times; transition involves a concentrated burst of effort, rather than a continually interrupted journey; a lock keeper may be stationed to help crews through

732-480: A lock is simple. For instance, if a boat travelling downstream finds the lock already full of water: If the lock were empty, the boat would have had to wait 5 to 10 minutes while the lock was filled. For a boat travelling upstream, the process is reversed; the boat enters the empty lock, and then the chamber is filled by opening a valve that allows water to enter the chamber from the upper level. The whole operation will usually take between 10 and 20 minutes, depending on

854-537: A lock, and the position of the forward edge of the cill is usually marked on the lock side by a white line. The edge of the cill is usually curved, protruding less in the center than at the edges. In some locks, there is a piece of oak about 9 in (23 cm) thick which protects the solid part of the lock cill. On the Oxford Canal it is called a babbie; on the Grand Union Canal it is referred to as

976-531: A natural resource." The southwest bridgehouse of the DuSable Bridge (Michigan Avenue) serves as a museum on the river, its history, its challenges, and its renaissance. The McCormick Bridgehouse & Chicago River Museum is a 5-floor, 1,613-square-foot (149.9 m ) museum that opened on June 10, 2006; it is named for Robert R. McCormick , formerly owner of the Chicago Tribune and president of

1098-824: A number of sites in the Chicago River system. Discharge from the North Branch is measured at Grand Avenue; between 2004 and 2010 this averaged 582 cubic feet (16.5 m ) per second. During the winter months as much as 75% of the flow in the North Branch is due to the discharge of treated sewage from the North Side Water Reclamation Plant into the North Shore Channel. Flow on the main stem is measured at Columbus Drive; between 2000 and 2006 this averaged 136 cubic feet (3.9 m ) per second. The name Chicago derives from

1220-480: A staircase lock can be used as an emergency dry dock). To avoid these mishaps, it is usual to have the whole staircase empty before starting to descend, or full before starting to ascend, apart from the initial chamber. One striking difference in using a staircase of either type (compared with a single lock, or a flight) is the best sequence for letting boats through. In a single lock (or a flight with room for boats to pass) boats should ideally alternate in direction. In

1342-404: A staircase, however, it is quicker for a boat to follow a previous one going in the same direction. Partly for this reason staircase locks such as Grindley Brook, Foxton, Watford and Bratch are supervised by lockkeepers, at least during the main cruising season, they normally try to alternate as many boats up, followed by down as there are chambers in the flight. As with a flight, it is possible on

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1464-504: A trading post near Wolf Point on the Chicago River in around 1778. In 1823 a government expedition used the name Gary River (phonetic spelling of Guillory ) to refer to the north branch of the Chicago River. Jean Baptiste Point du Sable is widely regarded as the first permanent resident of Chicago; he built a farm on the northern bank at the mouth of the river in the 1780s. The earliest known record of Pointe du Sable living in Chicago

1586-400: A tunnel, which when descending does not become visible until the chamber is nearly empty. A pound is the level stretch of water between two locks (also known as a reach ). The cill , also spelled sill , is a narrow horizontal ledge protruding a short way into the chamber from below the upper gates. Allowing the rear of the boat to "hang" on the cill is the main danger when descending

1708-439: Is a device used for raising and lowering boats , ships and other watercraft between stretches of water of different levels on river and canal waterways . The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock , a boat lift , or on a canal inclined plane , it is the chamber itself (usually then called a caisson ) that rises and falls. Locks are used to make

1830-426: Is a normal top gate, and the intermediate gates are all as tall as the bottom gate). As there is no intermediate pound, a chamber can only be filled by emptying the one above, or emptied by filling the one below: thus the whole staircase has to be full of water (except for the bottom chamber) before a boat starts to ascend, or empty (except for the top chamber) before a boat starts to descend. In an "apparent" staircase

1952-597: Is a system of rivers and canals with a combined length of 156 miles (251 km) that runs through the city of Chicago , including its center (the Chicago Loop ). Though not especially long, the river is notable because it is one of the reasons for Chicago's geographic importance: the related Chicago Portage is a link between the Great Lakes and the Mississippi River Basin , and ultimately

2074-674: Is crossed by the Dan Ryan Expressway ; these immovable bridges have a clearance of 60 feet (18 m) requiring large ships that pass underneath to have folding masts. At Ashland Avenue the river widens to form the U.S. Turning Basin, the west bank of which was the starting point of the Illinois and Michigan Canal . Prior to 1983, this was where the US Coast Guard Rules of the Road, Great Lakes ended & Rules of

2196-443: Is only a staircase if successive lock chambers share a gate (i.e. do not have separate top and bottom gates with a pound between them). Most flights are not staircases, because each chamber is a separate lock (with its own upper and lower gates), there is a navigable pound (however short) between each pair of locks, and the locks are operated in the conventional way. However, some flights include (or consist entirely of) staircases. On

2318-739: Is sent down the Chicago River, while the rest is used for drinking water. In late 2005, the Chicago-based Alliance for the Great Lakes proposed re-separating the Great Lakes and Mississippi River basins to address such ecological concerns as the spread of invasive species . In 1915, the SS Eastland , an excursion steam-liner preparing to leave the dock on the south gangway between the Clark Street Bridge and La Salle Street Bridge, rolled over, killing 844 of

2440-575: Is the change in water-level in the lock. The two deepest locks on the English canal system are Bath deep lock on the Kennet and Avon Canal and Tuel Lane Lock on the Rochdale Canal , which both have a rise of nearly 20 feet (6.1 m). Both locks are amalgamations of two separate locks, which were combined when the canals were restored to accommodate changes in road crossings. By comparison,

2562-642: Is the diary of Hugh Heward, who made a journey through Illinois in the spring of 1790. Antoine Ouilmette claimed to have arrived in Chicago shortly after this in July 1790. In 1795, in a then minor part of the Treaty of Greenville , an Indian confederation granted treaty rights to the United States, to a parcel of land at the mouth of the "Chicago River". This was followed by the 1816 Treaty of St. Louis and Treaty of Chicago , which ceded additional land in

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2684-881: The Bollène lock on the River Rhône has a fall of at least 23 m (75 ft), the Leerstetten, Eckersmühlen and Hilpoltstein locks on the Rhine–Main–Danube Canal have a fall of 24.67 m (80.9 ft), each and the Oskemen Lock on the Irtysh River in Kazakhstan has a drop of 42 m (138 ft). The natural extension of the flash lock , or staunch, was to provide an upper gate (or pair of gates) to form an intermediate "pound" which

2806-522: The Burnham Plan as early as 1909. Before reversal, the South Branch generally arose with joining forks in the marshy area called Mud Lake to flow to where it met the North Branch at Wolf Point forming the main branch. Since reversal, the source of the South Branch of the Chicago River is the confluence of the North Branch and main stem at Wolf Point. From here the river flows south passing

2928-573: The Chicago Cubs rally and parade for their 2016 World Series Championship celebrations, the river was dyed Cubs blue. Friends of the Chicago River executive director Margaret Frisbie told the Chicago Sun-Times , "We do not want to set a precedent where, every time we want to celebrate, we dye the river a different color and potentially hurt the aquatic life that lives in it. While it may seem festive, it's actually potentially harming

3050-681: The Forest Glen community area with Norwood Park and Jefferson Park . This stretch of the river meanders in a south-easterly direction, passing through golf courses and forest preserves until it reaches Foster Avenue , where it passes through residential neighborhoods on the north side of the Albany Park community area. In River Park the river meets the North Shore Channel , a canal with water pumped from Lake Michigan (at Wilmette ), built between 1907 and 1910 to increase

3172-476: The Grand Union . Operation of a staircase is more involved than a flight. Inexperienced boaters may find operating staircase locks difficult. The key worries (apart from simply being paralysed with indecision) are either sending down more water than the lower chambers can cope with (flooding the towpath, or sending a wave along the canal) or completely emptying an intermediate chamber (although this shows that

3294-599: The Gulf of Mexico . The river is also noteworthy for its natural and human-engineered history. In 1887, the Illinois General Assembly decided to reverse the flow of the Chicago River through civil engineering by taking water from Lake Michigan and discharging it into the Mississippi River watershed, partly in response to concerns created by an extreme weather event in 1885 that threatened

3416-606: The Illinois River and the Mississippi Valley across the Chicago Portage . This canal was the farthest west, and the last, of a series of United States' government land grant canals. It provided the only water route from New York City to New Orleans through the country's interior and Chicago. During the last ice age, the area that became Chicago was covered by Lake Chicago , which drained south into

3538-613: The Milan canal system sponsored by Francesco Sforza ) between 1452 and 1458. In Ancient Egypt, the river-locks was probably part of the Canal of the Pharaohs : Ptolemy II is credited by some for being the first to solve the problem of keeping the Nile free of salt water when his engineers invented the lock around 274/273 BC. All pound locks have three elements: The principle of operating

3660-600: The North Avenue Bridge , the North Branch divides, the original course of the river makes a curve along the west side of Goose Island , whilst the North Branch Canal cuts off the bend, forming the island. The North Branch Canal—or Ogden's Canal—was completed in 1857, and was originally 50 feet (15 m) wide and 10 feet (3.0 m) deep allowing craft navigating the river to avoid the bend. The 1902 Cherry Avenue Bridge , just south of North Avenue,

3782-655: The Sanitary District of Chicago , then headed by William Boldenweck, completely reversed the flow of the main stem and South Branch of the river using a series of canal locks , increasing the river's flow from Lake Michigan and causing it to empty into the newly completed Chicago Sanitary and Ship Canal . In 1999, this system was named a "Civil Engineering Monument of the Millennium" by the American Society of Civil Engineers (ASCE). Before this time,

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3904-598: The Song dynasty (960–1279 CE). The Songshi or History of the Song Dynasty, volume 307, biography 66, records how Qiao Weiyue, a high-ranking tax administrator, was frustrated at the frequent losses incurred when his grain barges were wrecked on the West River near Huai'an in Jiangsu . The soldiers at one double slipway, he discovered, had plotted with bandits to wreck heavy imperial barges so that they could steal

4026-567: The St. Charles Air Line Bridge . Between Polk and 18th Streets the river originally made a meander to the east; between 1927 and 1929 the river was straightened and moved 1 ⁄ 4 mile (0.40 km) west at this point to make room for a railroad terminal. The river turns to the southwest at Ping Tom Memorial Park where it passes under the Chicago Landmark Canal Street railroad bridge . The river turns westward where it

4148-460: The University of Illinois at Urbana–Champaign created a three-dimensional, hydrodynamic simulation of the Chicago River, which suggested that density currents are the cause of an observed bi-directional wintertime flow in the river. At the surface, the river flows east to west, away from Lake Michigan, as expected. But deep below, near the riverbed, water seasonally travels west to east, toward

4270-658: The forest preserve district of Cook County, Illinois has designated a section of the East Fork and North Branch from Willow Road in Northfield to Dempster Street in Morton Grove the Ralph Frese River Trail . The North Branch continues southwards through Niles , entering the city of Chicago near the intersection of Milwaukee Avenue and Devon Avenue , from where it serves as the boundary of

4392-609: The 100th anniversary of the Metropolitan Water Reclamation District of Greater Chicago ; between May and October the fountain sends an arc of water over the river for ten minutes every hour. On the north bank of the river, near the Chicago Landmark Michigan Avenue Bridge, is Pioneer Court , which marks the site of the homestead of Jean Baptiste Point du Sable who is recognized as the founder of Chicago. On

4514-519: The 17th century French rendering of shikaakwa or chicagou , the Native American name for ramps ( Allium tricoccum ), a type of edible wild leek , which grew abundantly near the river. The river, and its region, were named after the plant. Louis Jolliet and Jacques Marquette , though probably not the first Europeans to visit the area, are the first recorded to have visited the Chicago River in 1673, when they wrote of their discovery of

4636-689: The Carrapatelo and Valeira locks on the Douro river in Portugal, which are 279 feet (85 m) long and 39 feet (12 m) wide, have maximum lifts of 115 and 108 feet (35 and 33 m) respectively. The two Ardnacrusha locks near Limerick on the Shannon navigation in Ireland have a rise of 100 feet (30 m). The upper chamber rises 60 feet (18 m) and is connected to the lower chamber by

4758-466: The Chesapeake and Ohio Canal, the lockkeepers were required to remove the windlasses from all lock paddles at night, to prevent unauthorized use. A swell was caused by opening suddenly the paddle valves in the lock gates, or when emptying a lock. To help boats traveling downstream exit a lock, the locksman would sometimes open the paddles to create a swell, which would help "flush" the boat out of

4880-443: The Chicago River has 38 movable bridges spanning it, down from a peak of 52 bridges. These bridges are of several different types, including trunnion bascule , Scherzer rolling lift , swing bridges , and vertical-lift bridges . The Chicago River has been highly affected by industrial and residential development with attendant changes to the quality of the water and riverbanks. Several species of freshwater fish are known to inhabit

5002-479: The Chicago River is dyed green in observance of St. Patrick's Day . The actual event occurs on the Saturday on or before March 17. The tradition of dyeing the river green arose by accident in 1961 when plumbers used fluorescein dye to trace sources of illegal pollution discharges. The dyeing of the river is still sponsored by the local plumbers union. The Environmental Protection Agency (EPA) disallowed

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5124-587: The Chicago River remains a very popular target for freshwater recreational fishing. In 2006, the Chicago Park District started the annual "Mayor Daley's Chicago River Fishing Festival", which has increased in popularity with each year. Between 2013 and 2016, the Chicago Park District opened four boat houses, two on the south branch and two on the north, for river recreation. As part of a more than fifty-year-old Chicago tradition,

5246-456: The Chicago River was known by many local residents of Chicago as "the stinking river" because of the massive amounts of sewage and pollution that poured into the river from Chicago's booming industrial economy. Through the 1980s, the river was quite dirty and often filled with garbage ; however, during the 1990s, it underwent extensive cleaning as part of an effort at beautification by Chicago Mayor Richard M. Daley . In 2005, researchers at

5368-631: The Chicago Sanitary District. The Robert R. McCormick Foundation was the major donor that helped meet the $ 950,000 cost to open the museum. It is run by the Friends of the Chicago River, a non-profit environmental organization. Visitors are also allowed to access the bridge's gear room; during the spring and fall bridge lifting visitors can see the bridge gears in operation as the leaves are raised and lowered. Due to its small size and tight access stairway only 79 people are allowed inside

5490-404: The Chicago area. In 1803, Fort Dearborn was constructed on the bank opposite what had been Point du Sable's settlement, on the site of the present-day Michigan Avenue Bridge . Lieutenant James Strode Swearingen, who led the troops from Detroit to Chicago to establish the fort, described the river as being about 30 yards (27 m) wide and upwards of 18 feet (5.5 m) deep at the place where

5612-567: The Grand Union (Leicester) Canal, the Watford flight consists of a four-chamber staircase and three separate locks; and the Foxton flight consists entirely of two adjacent 5-chamber staircases. Where a very steep gradient has to be climbed, a lock staircase is used. There are two types of staircase, "real" and "apparent". A "real" staircase can be thought of as a "compressed" flight, where

5734-782: The Lake Street, Randolph Street, Washington Street, Madison Street, Monroe Street, Adams Street, Jackson Boulevard, Van Buren Street, Ida B. Wells Drive, and Harrison Street bridges before leaving the downtown Loop community area. Notable buildings that line this stretch of the river include the Boeing Company World Headquarters, the Civic Opera House , the Chicago Mercantile Exchange , Union Station and Willis Tower . The river continues southwards past railroad yards and

5856-549: The Mississippi Valley. As the ice and water retreated, a short 12-to-14-foot (3.7 to 4.3 m) ridge was exposed about a mile inland, which generally separated the Great Lakes' watershed from the Mississippi Valley, except in times of heavy precipitation or when winter ice flows prevented drainage. By the time Europeans arrived, the Chicago River flowed sluggishly into Lake Michigan from Chicago's flat plain. As Chicago grew, this allowed sewage and other pollution into

5978-594: The Municipal Flag of Chicago by two horizontal blue stripes. Its three branches serve as the inspiration for the Municipal Device , a three-branched, Y-shaped symbol that is found on many buildings and other structures throughout Chicago. When it followed its natural course, the North and South Branches of the Chicago River converged at Wolf Point to form the main stem, which jogged southward from

6100-583: The North Branch is lined with a mixture of residential developments, retail parks, and industry until it reaches the industrial area known as the Clybourn Corridor. Here it passes beneath the Cortland Street Drawbridge , which was the first 'Chicago-style' fixed-trunnion bascule bridge built in the United States, and is designated as an ASCE Civil Engineering Landmark and a Chicago Landmark . At North Avenue , south of

6222-433: The North Branch of the Chicago River the Guarie River, or Gary's River, after a trader who may have settled the west bank of the river a short distance north of Wolf Point, at what is now Fulton Street. The source of the North Branch is in the northern suburbs of Chicago where its three principal tributaries converge. The Skokie River —or East Fork—rises from a flat plain, historically a wetland, near Park City, Illinois to

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6344-451: The North and Middle forks merge at the Watersmeet Woods forest preserve west of Wilmette . From there the North Branch flows south towards Morton Grove . The third tributary, the West Fork, rises near Mettawa and flows south through Lincolnshire, Bannockburn , Deerfield , and Northbrook , meeting the North Branch at Morton Grove. In recognition of the work of Ralph Frese in promoting canoeing on and conservation of Chicago-area rivers,

6466-416: The Road, Western Rivers began. Since 1983, there is just a single Inland Navigational Rules passed by Congressional Act in 1980 (Public Law 96-591). At the basin the river is joined by a tributary, the South Fork of the river, which is commonly given the nickname Bubbly Creek . A bridge used to span the South Fork at this point that was too low for boats to pass meaning that their cargo needed to be unloaded at

6588-400: The US Army Corps in January 2013 revealed that both Lake Michigan and Lake Huron had reached their "lowest ebb since record keeping began in 1918, and the lakes could set additional records over the next few months, the corps said. The lakes were 74 centimetres (29 inches) below their long-term average and had declined 43 centimetres (17 inches) since January 2012". Canal lock A lock

6710-420: The advent of canals in Britain. The sides of the turf-lock are sloping so, when full, the lock is quite wide. Consequently, this type of lock needs more water to operate than vertical-sided brick- or stone-walled locks. On British canals and waterways most turf-sided locks have been subsequently rebuilt in brick or stone, and so only a few good examples survive, such as at Garston Lock , and Monkey Marsh Lock , on

6832-426: The boat entered the lock. Pulling on the rope slowed the boat, due to the friction of the rope against the post. A rope 2 + 1 ⁄ 2 inches (6.4 cm) in diameter and about 60 feet (18 meters) long was typically used on the Erie Canal to snub a boat in a lock. One incident, which took place in June 1873 on the Chesapeake and Ohio Canal, involved the boat the Henry C. Flagg and its drunk captain. That boat

6954-405: The bottom cill at all but the higher tides – the new bottom chamber rises just far enough to get the boat over the original lock cill. In China, the recently completed Three Gorges Dam includes a double five-step staircase for large ships, and a ship lift for vessels of less than 3000 metric tons. Examples of "apparent" staircases are Foxton Locks and Watford Locks on the Leicester Branch of

7076-411: The bridge, and the neighborhood at its east end became known as Bridgeport . The river continues to the south west, entering the Chicago Sanitary and Ship Canal at Damen Avenue. The original West Fork of the South Branch, which before 1935 led towards Mud Lake and the Chicago Portage , has been filled in; a triangular intrusion into the north bank at Damen Avenue marks the place where it diverged from

7198-406: The canal would cause frequent interruptions of the heavy road traffic. It can be emptied by pumping – but as this uses a lot of electricity the method used when water supplies are adequate is to drain the lock to a nearby burn . In 2016 the Kieldrecht Lock in the Port of Antwerp in Belgium took over the title of the world's largest lock from the Berendrecht Lock in the same port and still has

7320-424: The chambers so that some water from the emptying chamber helps to fill the other. This facility has long been withdrawn on the English canals, although the disused paddle gear can sometimes be seen, as at Hillmorton on the Oxford Canal . Elsewhere they are still in use; a pair of twinned locks was opened in 2014 on the Dortmund–Ems Canal near Münster , Germany. The once-famous staircase at Lockport, New York ,

7442-505: The chambers still have common gates, but the water does not pass directly from one chamber to the next, going instead via side ponds. This means it is not necessary to ensure that the flight is full or empty before starting. Examples of famous "real" staircases in England are Bingley and Grindley Brook . Two-rise staircases are more common: Snakeholme Lock and Struncheon Hill Lock on the Driffield Navigation were converted to staircase locks after low water levels hindered navigation over

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7564-404: The chance of a boat finding a lock set in its favour. There can also be water savings: the locks may be of different sizes, so that a small boat does not need to empty a large lock; or each lock may be able to act as a side pond (water-saving basin) for the other. In this latter case, the word used is usually "twinned": here indicating the possibility of saving water by synchronising the operation of

7686-443: The cill bumper. Some canal operation authorities, primarily in the United States and Canada, call the ledge a miter sill (mitre sill in Canada). Gates are the watertight doors which seal off the chamber from the upper and lower pounds. Each end of the chamber is equipped with a gate, or pair of half-gates, traditionally made of oak or elm but now usually made of steel ). The most common arrangement, usually called miter gates ,

7808-402: The city's water supply. In 1889, the state created the Chicago Sanitary District (now the Metropolitan Water Reclamation District ) to replace the Illinois and Michigan Canal with the Chicago Sanitary and Ship Canal , a much larger waterway, because the former had become inadequate to serve the city's increasing sewage and commercial navigation needs. Completed by 1900, the project reversed

7930-412: The clean-water source for the city, contributing to several public health problems, like typhoid fever . Starting in 1848, much of the Chicago River's flow was also diverted across the Chicago Portage into the Illinois and Michigan Canal . In 1871, the old canal was deepened in an attempt to completely reverse the river's flow but the reversal of the river only lasted one season. Finally, in 1900,

8052-416: The concept has been suggested in a number of cases, the only example in the world of a drop lock that has actually been constructed is at Dalmuir on the Forth and Clyde Canal in Scotland. This lock, of the single-chamber type, was incorporated during the restoration of the canal, to allow the replacement of a swing bridge (on a busy A road) by a fixed bridge, and so answer criticisms that the restoration of

8174-402: The controlling works at Lake Michigan; passing beneath the Outer Drive , Columbus Drive , Michigan Avenue , Wabash Avenue , State Street , Dearborn Street , Clark Street , La Salle Street , Wells Street , and Franklin Street bridges en route to its confluence with the North Branch at Wolf Point. At McClurg Court it passes the Centennial Fountain , which was built in 1989 to celebrate

8296-408: The course of the canal. From there, the water flows down the canal through the southwest side of Chicago and southwestern suburbs and, in time, into the Des Plaines River between Crest Hill on the west and Lockport on the east, just north of the border between Crest Hill and Joliet, Illinois , eventually reaching the Gulf of Mexico . The United States Geological Survey monitors water flow at

8418-416: The damage of the storm event. The same report noted that the low Great Lakes levels were drought-induced, caused by a very hot, dry summer and a lack of a solid snowpack in the winter of 2012. At the time of the report, December 2012, Lake Michigan-Huron was 28 inches below its long-term average which is near the record lows of 1964. Historic lake levels for Lake Michigan reported from 1918 to 1998 show that

8540-450: The entire building is hand washed to preserve the terra cotta. At night, the building is brightly lit with floodlights. The Wrigley Building was Chicago's first air-conditioned office building. If one walks through the center doors, one will enter a secluded park area overlooking the Chicago River . In the 1957 science fiction film Beginning of the End , giant grasshoppers attack downtown Chicago, and in one scene are shown climbing up

8662-425: The flight quickly; and where water is in short supply, a single pump can recycle water to the top of the whole flight. The need for a flight may be determined purely by the lie of the land, but it is possible to group locks purposely into flights by using cuttings or embankments to "postpone" the height change. Examples: Caen Hill locks, Devizes . "Flight" is not synonymous with "Staircase" (see below). A set of locks

8784-490: The flow of the North Branch and help flush it into the South Branch and from there to the Chicago Sanitary and Ship Canal . From the confluence with the North Shore Channel south to Belmont Avenue the North Branch flows through mostly residential neighborhoods in a man-made channel that was dug to straighten and deepen the river, helping it to carry the additional flow from the North Shore Channel. South of Belmont

8906-413: The flow of the main stem and South Branch and altered the flow of the North Branch by using a series of canal locks and pumping stations, increasing the flow from Lake Michigan into the river, causing the river to empty into the new canal instead. In 1999, the system was named a "Civil Engineering Monument of the Millennium" by the American Society of Civil Engineers (ASCE). The river is represented on

9028-518: The form of the now-disused Écluse des Lorraines , connecting the Canal latéral à la Loire with the River Allier . A drop lock can consist of two conventional lock chambers leading to a sump pound, or a single long chamber incorporating the sump – although the term properly applies only to the second case. As the pounds at either end of the structure are at the same height, the lock can only be emptied either by allowing water to run to waste from

9150-535: The fort was intended to be built; the riverbanks were 8 feet (2.4 m) high on the south side and 6 feet (1.8 m) on the north. Between 1816 and 1828 soldiers from Fort Dearborn cut channels through the sandbar at the mouth of the river to allow yawls to bring supplies to the fort. These channels rapidly clogged with sand requiring a new one to be cut. On March 2, 1833, $ 25,000 was appropriated by Congress for harbor works, and work began in June of that year under

9272-514: The geographically vital Chicago Portage . Marquette returned in 1674, camped a few days near the mouth of the river, then moved on to the Chicago River– Des Plaines River portage , where he stayed through the winter of 1674–75. The Fox Wars effectively closed the Chicago area to Europeans in the first part of the 18th century. The first non-native to re-settle in the area may have been a trader named Guillory, who might have had

9394-414: The intermediate pounds have disappeared, and the upper gate of one lock is also the lower gate of the one above it. However, it is incorrect to use the terms staircase and flight interchangeably: because of the absence of intermediate pounds, operating a staircase is very different from operating a flight. It can be more useful to think of a staircase as a single lock with intermediate levels (the top gate

9516-555: The lake and river for longer periods of time, limiting navigation. A reversal flow of the Chicago River into Lake Michigan would have a negative impact on navigation and on the quality of Lake Michigan water, which is the source of drinking water. Chicago's raw sewage in the river is normally carried upstream toward the Mississippi River which flows south towards the Gulf of Mexico. On January 9, 2013, Chicago meteorologists announced 320 days without at least one inch of snowfall. Water levels in

9638-595: The lake started to level off with the river and sewage was visible at the cusp of the locks, just a few hundred feet from Lake Michigan. David St. Pierre, executive director of the Metropolitan Water Reclamation District of Greater Chicago warned the low lake levels were nearing a point of real concern. However, the District maintains that it is not possible for the river to reverse due to low lake level alone. Measurements taken by

9760-499: The lake. All outflows from the Great Lakes Basin are regulated by the joint U.S.-Canadian Great Lakes Commission , and the outflow through the Chicago River is set under a U.S. Supreme Court decision (1967, modified 1980 and 1997). The city of Chicago is allowed to remove 3,200 cubic feet per second (91 m /s) of water from the Great Lakes system; about half of this, 1 billion US gallons per day (44 m /s),

9882-455: The levels below Michigan Avenue, have a combined area of 453,433 square feet (42,125.3 m). The two towers are of differing heights, with the south tower rising to 30 stories and the north tower to 21 stories. On the south tower is a clock with faces pointing in all directions. Each face is 19 feet 7 inches (5.97 m) in diameter. The building is clad in glazed terra-cotta , which provides its gleaming white façade. On occasion,

10004-403: The lock gates could be replaced and the boat removed from the lock. To economise, especially where good stone would be prohibitively expensive or difficult to obtain, composite locks were made, i.e. they were constructed using rubble or inferior stone, dressing the inside walls of the lock with wood, so as not to abrade the boats. This was done, for instance, on the Chesapeake and Ohio Canal with

10126-403: The lock. A boatsman might ask for a back swell, that is, to open and shut the paddles a few times to create some waves, to help him get off the bank where he was stuck. If boats ran aground (from being overloaded) they sometimes asked passing crews to tell the upstream lock to give them an extra heavy swell, which consisted of opening all the paddles on the lock gate, creating a surge that affected

10248-757: The locks near the Paw Paw Tunnel . and also the Chenango Canal On large modern canals, especially very large ones such as ship canals , the gates and paddles are too large to be hand operated, and are operated by hydraulic or electrical equipment. On the Caledonian Canal the lock gates were operated by man-powered capstans , one connected by chains to open the gate and another to draw it closed. By 1968 these had been replaced by hydraulic power acting through steel rams. The construction of locks (or weirs and dams) on rivers obstructs

10370-449: The low levels observed in 1964 were the lowest since 1918. In 2012 Lake Michigan-Huron's seasonal rise was about 4 inches where it usually is about 12 inches. Normally the Chicago River water level is two feet lower than the lake and therefore does not flow into the lake. If the lake level falls too low threatening to reverse the river flow, the Metropolitan Water Reclamation District of Greater Chicago would be forced to close locks between

10492-406: The more than 2500 passengers. The roll of the heavy steamer happened very quickly and many of the passengers were trapped under water by the hull, moving objects such as pianos and tables, the crush of bodies, or their heavy clothes. Frantic if disordered rescue attempts ensued and early versions of what may be regarded as trauma teams formed to address the shocking scene. The site on the south bank at

10614-749: The museum at any one time. In October 2019, Chicago Tribune cultural arts writer Steve Johnson profiled the museum, calling its gear room where the DuSable Bridge mechanics can be viewed "a little chamber of heaven for infrastructure nerds". The US Army Corps of Engineers have monitored the development of harbors and channels for navigation on the Great Lakes since the early 1800s. They began monitoring hydrological conditions and lake levels in 1918. A December 26, 2012 report revealed that Chicago District navigation infrastructure did receive significant impacts from Hurricane Sandy with some areas experiencing severe shoaling. Chicago Shoreline Project mitigated

10736-688: The new canal was low. This resulted in a sequential pair of locks, with gates pointing in opposite directions: one example was at Hall Green near Kidsgrove , where the southern terminus of the Macclesfield Canal joined the Hall Green Branch of the earlier Trent and Mersey Canal . The four gate stop lock near Kings Norton Junction, between the Stratford-upon-Avon Canal and the Worcester and Birmingham Canal

10858-528: The passage of fish. Some fish such as lampreys, trout and salmon go upstream to spawn. Measures such as a fish ladder are often taken to counteract this. Navigation locks have also potential to be operated as fishways to provide increased access for a range of biota. Locks can be built side by side on the same waterway. This is variously called doubling , pairing , or twinning . The Panama Canal has three sets of double locks. Doubling gives advantages in speed, avoiding hold-ups at busy times and increasing

10980-536: The practice "gives the impression that it is lifeless and artificial", adding "Friends doesn't think that the river should be treated as a decoration for an annual holiday, but treasured and cared for as the wonderful natural and recreational resource it deserves to be". In 2009 First Lady Michelle Obama , a Chicago native, inspired by the river tradition, requested that the water in the White House fountains be dyed green to celebrate St. Patrick's Day. For

11102-412: The present course of the river to avoid a baymouth bar , entering Lake Michigan at about the level of present-day Madison Street . Today, the main stem of the Chicago River flows west from Lake Michigan to Wolf Point, where it converges with the North Branch to flow into the South Branch, where the river's course goes south and west to empty in the Chicago Sanitary and Ship Canal . Early settlers named

11224-462: The river due to PCB and mercury contamination, including a "do not eat" advisory for carp more than 12 inches long. There are concerns that silver carp and bighead carp , now invasive species in the Mississippi and Illinois Rivers , may reach the Great Lakes through the Chicago River. A program on the north channel next to Goose Island seeks to increase wildlife habitat through

11346-665: The river or when the level of the lake is more than 2 feet below the Chicago City Datum. Acoustic velocity meters at the Columbus Drive Bridge and the T. J. O'Brien lock on the Calumet River monitor the diversion of water from Lake Michigan to the Mississippi River basin, which is limited to an average of 3,200 cubic feet (91 m ) per second per year over the 40-year period from 1980 to 2020. The main stem flows 1.5 miles (2.4 km) west from

11468-579: The river passes Marina City , the Reid, Murdoch & Co. Building , and Merchandise Mart , and 333 Wacker Drive . Since the early 2000s, the south shore of the main stem has been developed as the Chicago Riverwalk . It provides a linear, lushly landscaped park intended to offer a peaceful escape from the busy Loop and a tourist attraction. Different sections are named Market, Civic, Arcade, and Confluence. The plans reflect ideas first proposed by

11590-579: The river through sluice gates at the Chicago River Controlling Works with a small additional flow provided for the passage of boats between the river and Lake Michigan through the Chicago Harbor Lock . The surface level of the river is maintained at 0.5 to 2 feet (0.15 to 0.61 m) below the Chicago City Datum (579.48 feet [176.63 m] above mean sea level) except for when there is excessive storm run-off into

11712-538: The river, including largemouth and smallmouth bass , rock bass , crappie , bluegill , catfish , and carp . The river also has a large population of crayfish . The South Fork of the Main (South) Branch, which was the primary sewer for the Union Stock Yards and the meat packing industry , was once so polluted that it became known as Bubbly Creek . Illinois has issued advisories regarding eating fish from

11834-405: The sandbar was 200 feet (61 m) wide and 3 to 7 feet (0.91 to 2.13 m) deep, flanked by piers 200 feet (61 m) long on the south wall and 700 feet (210 m) long to the north. Allen's work continued, and by October 1837 the still unfinished piers had been extended to 1,850 and 1,200 feet (560 and 370 m) respectively. In 1848, the Illinois and Michigan canal linked the river to

11956-582: The shape of the Giralda tower of Seville's Cathedral combined with French Renaissance details. The 425-foot (130 m) south tower was completed in September 1921 and the north tower in May 1924. Walkways between the towers were added at the ground level and the third floor. In 1931, another walkway was added at the fourteenth floor to allow for a rearrangement of Wrigley's offices. The two towers, not including

12078-589: The side of the Wrigley Building. The Wrigley Building was sold in 2011 to a group of investors that includes Zeller Realty Group and Groupon co-founders Eric Lefkofsky and Brad Keywell . The new owners made the building more attractive to businesses by adding a Walgreens , a coffee shop, a fitness center and a nursing room for mothers. Addresses at 400 North Michigan Avenue: Addresses at 410 North Michigan Avenue: Chicago River 41°53′11″N 87°38′15″W  /  41.88639°N 87.63750°W  / 41.88639; -87.63750 The Chicago River

12200-469: The size of the lock and whether the water in the lock was originally set at the boat's level. Boaters approaching a lock are usually pleased to meet another boat coming towards them, because this boat will have just exited the lock on their level and therefore set the lock in their favour – saving about 5 to 10 minutes. However, this is not true for staircase locks, where it is quicker for boats to go through in convoy, and it also uses less water. The rise

12322-673: The south bank of the river is the site of Fort Dearborn , an army fort, first established in 1803. Notable buildings surrounding this area include the NBC Tower , the Tribune Tower , and the Wrigley Building . The river turns slightly to the south west between Michigan Avenue and State Street, passing the Trump International Hotel and Tower , 35 East Wacker , and 330 North Wabash . Turning west again

12444-640: The southeast end of the La Salle Street Bridge is now the location of a memorial first dedicated in 1989. On April 13, 1992, a flood occurred when a pile driven into the riverbed caused stress fractures in the wall of a long-abandoned tunnel of the Chicago Tunnel Company near the Kinzie Street railroad bridge . Most of the 60-mile (97 km) network of underground freight railway, which encompasses much of downtown,

12566-407: The spilled grain. In 984 Qiao installed a pair of sluice-gates two hundred and fifty feet apart, the entire structure roofed over like a building. By siting two staunch gates so close to one another, Qiao had created a short stretch of canal, effectively a pound-lock, filled from the canal above by raising individual wooden baulks in the top gate and emptied into the canal below by lowering baulks in

12688-411: The staircase by moving sideways around each other; or at peak times, one can have all the chambers full simultaneously with boats travelling in the same direction. When variable conditions meant that a higher water level in the new canal could not be guaranteed, then the older company would also build a stop lock (under its own control, with gates pointing towards its own canal) which could be closed when

12810-413: The sump to a lower stream or drain, or (less wastefully) by pumping water back up to the canal. Particularly in the two-chamber type, there would be a need for a bypass culvert, to allow water to move along the interrupted pound and so supply locks further down the canal. In the case of the single-chamber type, this can be achieved by keeping the lock full and leaving the gates open while not in use. While

12932-432: The supervision of Major George Bender, the commandant at Fort Dearborn. In January 1834 James Allen took over the supervision of this work and, aided by a February storm that breached the sandbar, on July 12, 1834, the harbor works had progressed enough to allow a 100-short-ton (91 t) schooner, the Illinois to sail up the river to Wolf Point and dock at the wharf of Newberry & Dole. The initial entrance through

13054-543: The title for largest volume. In 2022 the IJmuiden sea lock serving the Port of Amsterdam became the world's largest lock by surface area. The lock is 500 m (1,600 ft) long, 70 m (230 ft) wide and has sliding lock gates creating a usable depth of 18 m (59 ft). The size of locks cannot be compared without considering the difference in water level that they are designed to operate under. For example,

13176-400: The top gate and raising ones in the lower. A turf-sided lock is an early form of canal lock design that uses earth banks to form the lock chamber, subsequently attracting grasses and other vegetation, instead of the now more familiar and widespread brick, stone, or concrete lock wall constructions. This early lock design was most often used on river navigations in the early 18th century before

13298-462: The two locks was rather more than 50 paces, and the whole space was covered with a great roof like a shed. The gates were 'hanging gates'; when they were closed the water accumulated like a tide until the required level was reached, and then when the time came it was allowed to flow out. The water level could differ by 4 or 5 feet (1.2 or 1.5 m) at each lock and in the Grand Canal the level

13420-534: The use of floating plant islands. The program is managed by the non-profit conservation group Urban Rivers with assistance from the Shedd Aquarium . As with some other bodies of water in the United States, the river has seen several successful efforts to improve water quality since the passage of the Clean Water Act of 1972 and related state and local efforts. Despite the pollution concerns,

13542-411: The use of fluorescein for this purpose, since it was shown to be harmful to the river. The parade committee switched to a mix involving forty pounds of powdered vegetable dye. Though the committee closely guards the exact formula, they insist that it has been tested and verified safe for the environment. The environmental organization Friends of the Chicago River disapproves of dyeing the river, saying

13664-416: The water on the pound above sometimes causing boats to run aground. In addition, it raised the water level on the pound below, causing some boats to strike bridges or get stuck. On horse-drawn and mule-drawn canals, snubbing posts were used to slow or stop a boat in the lock. A 200-ton boat moving at a few miles an hour could destroy the lock gate. To prevent this, a rope was wound around the snubbing post as

13786-781: The west of the city of Waukegan . It then flows southward, paralleling the shore of Lake Michigan, through wetlands, the Greenbelt Forest Preserve and a number of golf courses towards Highland Park, Illinois . South of Highland Park the river passes the Chicago Botanic Gardens and through an area of former marshlands known as the Skokie Lagoons . From the west, the Middle Fork arises near Rondout, Illinois and flows southwards through Lake Forest and Highland Park. The two tributaries of

13908-512: The whole pound below. On the Erie Canal, some loaded boats needed a swell to get out of the lock. Particularly lumber boats, being top heavy, would list to one side and get stuck in the lock, and needed a swell to get them out. Some lockkeepers would give a swell to anyone to help them on the way, but some would ask for money for the swell. The Erie Canal management did not like swelling for two reasons. First, it used too much water lowering

14030-463: Was all that need be emptied when a boat passed through. This type of lock, called a pound lock was known in Imperial China and ancient Europe and was used by Greek engineers in the Canal of the Pharaohs under Ptolemy II (284 to 246 BC), when engineers solved the problem of overcoming the difference in height through canal locks . Pound locks were first used in medieval China during

14152-422: Was already leaking; the crew, having partially pumped the water out, entered Lock 74, moving in front of another boat. Because they failed to snub the boat, it crashed into and knocked out the downstream gates. The outrush of water from the lock caused the upstream gates to slam shut, breaking them also, and sending a cascade of water over the boat, sinking it. This suspended navigation on the canal for 48 hours until

14274-416: Was also a doubled set of locks. Five twinned locks allowed east- and west-bound boats to climb or descend the 60 feet (18 m) Niagara Escarpment , a considerable engineering feat in the nineteenth century. While Lockport today has two large steel locks, half of the old twin stair acts as an emergency spillway and can still be seen, with the original lock gates having been restored in early 2016. Loosely,

14396-473: Was constructed to carry the Chicago, Milwaukee and St. Paul Railway onto Goose Island. It is a rare example of an asymmetric bob-tail swing bridge and was designated a Chicago Landmark in 2007. From Goose Island the North Branch continues to flow south east to Wolf Point where it joins the main stem. Since the late 19th century, the source of the main stem of the Chicago River is Lake Michigan. Water enters

14518-441: Was eventually flooded, along with the lower levels of buildings it once serviced and attached underground shops and pedestrian ways. The first bridge across the Chicago River was constructed over the North Branch near the present day Kinzie Street in 1832. A second bridge, over the South Branch near Randolph Street, was added in 1833. The first moveable bridge was constructed across the main stem at Dearborn Street in 1834. Today,

14640-412: Was invented by Leonardo da Vinci sometime around the late 15th century. On the old Erie Canal , there was a danger of injury when operating the paddles: water, on reaching a certain position, would push the paddles with a force which could tear the windlass (or handle) out of one's hands, or if one was standing in the wrong place, could knock one into the canal, leading to injuries and drownings. On

14762-456: Was raised in this way by 138 feet (42 m). In medieval Europe a sort of pound lock was built in 1373 at Vreeswijk , Netherlands. This pound lock serviced many ships at once in a large basin . Yet the first true pound lock was built in 1396 at Damme near Bruges , Belgium. The Italian Bertola da Novate (c. 1410–1475) constructed 18 pound locks on the Naviglio di Bereguardo (part of

14884-606: Was replaced in 1914 by a pair of guillotine lock gates which stopped the water flow regardless of which canal was higher. These gates have been permanently open since nationalisation. The best known example of a round lock is the Agde Round Lock on the Canal du Midi in France. This serves as a lock on the main line of the canal and allows access to the Hérault River . A second French round lock can be found in

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