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25-858: Interstate 605 (abbreviated I-605 , officially known as the San Gabriel River Freeway ) is a 27-mile-long (43 km) major north–south auxiliary Interstate Highway in the Greater Los Angeles urban area of Southern California . It runs from I-405 and State Route 22 (SR 22) in Seal Beach in Orange County to I-210 just south of the Irwindale – Duarte border in Los Angeles County . The San Gabriel River Freeway closely parallels

50-517: A place where the highway mileage resets to zero. Beltways are also preceded by an even number in the first digit. Some examples of beltways include: National Highway System (United States) Individual states are encouraged to focus federal funds on improving the efficiency and safety of this network. The roads within the system were identified by the United States Department of Transportation (USDOT) in cooperation with

75-458: A state. There are three states that have no auxiliary Interstate Highways: Alaska, Arizona, and New Mexico. North Dakota has an auxiliary route, but it is unsigned , and Wyoming's does not meet Interstate Highway standards. Auxiliary Interstates are divided into three types: spur , loop , and bypass routes. The first digit of the three digits usually signifies whether a route is a bypass, spur, or beltway. The last two digits are derived from

100-485: A unified, interconnected manner, including the transportation systems of the future, to reduce energy consumption and air pollution while promoting economic development and supporting the Nation's preeminent position in international commerce". The National Highway System Designation Act of 1995 ( Pub. L.   104–59 (text) (PDF) , 109  Stat.   568 , COMPS-1425 ) is a United States Act of Congress that

125-502: Is defined in the state highway system as Route 605 . It is defined as such in the California Streets and Highways Code 's section 619: Route 605 is from: (a) Route 1 near Seal Beach to Route 405 . (b) Route 405 to Route 210 near Duarte . Route 605 shall be known and designated as the “San Gabriel River Freeway.” The portion in subdivision (a) was never constructed, nor is any conventional roadway present along

150-706: Is part of the California Freeway and Expressway System , and is part of the National Highway System , a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration . I-605 from I-405 to I-10 is known as the San Gabriel River Freeway, as named by Senate Bill 99, Chapter 1101 in 1967. In 1957, the number for this route

175-776: The Foothill Freeway , ( I-210 ) just south of the Irwindale – Duarte border. Ramps from I-605 then extend north to Huntington Drive in Duarte. I-605 follows most of the length of the San Gabriel River from the San Diego Freeway in Seal Beach to the Santa Fe Dam . Typically dry riverbed and flood basins are visible from many portions of the route, especially near the northern terminus. In

200-482: The San Gabriel River for most of its alignment, hence its name, which is one of the few Southern California freeways not named after a city along its route. Aside from changes to the interchange with I-105 (which did not open until the early 1990s), and the addition of an HOV lane between I-405 and I-10, I-605 is one of the only remaining freeways that kept its original alignment throughout its run through Los Angeles County since it first opened. The entirety of I-605

225-520: The federal government from requiring states to use federal-aid highway funds to convert existing signs or purchase new signs with metric units. The act also created a State Infrastructure Bank pilot program. Ten states were chosen in 1996 for this new method of road financing. These banks would lend money like regular banks, with funding coming from the federal government or the private sector , and they would be repaid through such means as highway tolls or taxes. In 1997, 28 more states asked to be part of

250-404: The following road networks (specific routes may be part of more than one sub-system): The system includes 4% of the nation's roads, but carries more than 40% of all highway traffic, 75% of heavy truck traffic, and 90% of tourist traffic. All urban areas with a population of over 50,000 and about 90% of America's population live within 5 miles (8.0 km) of the network, which is the longest in

275-562: The main Interstate Highway. For instance, I-115 contains an odd number in the first digit (1), which indicates that this freeway is a spur. The last two digits signify the highway's origin. In this case, the "15" in I-115 shows that it is a supplement to I-15 . Exceptions to the standard numbering guidelines exist for a number of reasons. In some cases, original routes were changed, extended, or abandoned, leaving discrepancies in

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300-575: The mid-2000s, a HOV lane was added for motorists with two or more people to use between I-405 and I-10. The HOV lane ends at I-10 and there are no plans to extend it to I-210 at this time. With the addition of the HOV lane, the left shoulder was eliminated to avoid massive costs to widen the freeway. The highway also suffers from traffic jams regularly, especially the junction with I-5 (the Santa Ana Freeway ). Newer signs with exit numbers replaced

325-560: The older signs between the Orange County line and I-10 in 2016, with the completion of the I-605 and I-10 junction improvement. I-605 is one of the only Southern California freeways without destinations ( control cities ) such as " Seal Beach " or " Irwindale " since its opening. Rather, cardinal directions ("NORTH" or "SOUTH"), and a simple "THRU TRAFFIC" designation in place of control cities, are used on signs along I-605 itself. I-605

350-542: The parent route at one end; bypasses , which connect to the parent route at both ends; and beltways , which form a circle that intersects the parent route at two locations. Some routes connect to the parent route at one end but to another route at the other end; some states treat these as spurs while others treat them as bypasses. Like the primary Interstate Highways , auxiliary highways meet Interstate Highway standards (with rare exceptions ). The shorter auxiliary routes branch from primary routes; their numbers are based on

375-489: The parent route's number. All of the supplement routes for Interstate 95 (I-95) are designated with a three-digit number ending in "95": I-x95. With some exceptions, spur routes are numbered with an odd hundreds digit (such as I-395 ), while bypasses and beltways are numbered with an even hundreds digit (such as I-695 ). Because longer Interstates may have many such supplemental routes, the numbers can repeat from state to state along their route, but they will not repeat within

400-508: The program. Ohio was the first state to use a state infrastructure bank to start building a road. An advantage of this method was completing projects faster; state laws and the lack of appropriate projects were potential problems. According to the Federal Highway Administration , the 160,000-mile (260,000 km) National Highway System includes roads important to the United States' economy, defense, and mobility, from one or more of

425-415: The same Interstate, some states treat these as bypasses while others treat these as spurs—see Spur route above. A beltway (also known as a loop route ) completely surrounds a metropolitan city, and it is often connected with multiple junctions to other routes. Unlike other auxiliary Interstate Highways (and by extension, all primary Interstate Highways ), beltways do not have termini; however, they have

450-780: The section. The interchange with I-405 and SR 22 was built to accommodate a future extension south to SR 1. The southern terminus of I-605 is at the San Diego ( I-405 ) and Garden Grove ( SR 22 ) Freeways in Seal Beach . From there, it runs roughly north through the Gateway Cities of the Los Angeles Basin . It then shifts north-northeast, crossing the Whittier Narrows and across the San Gabriel Valley . I-605 then ends at its junction with

475-576: The states, local officials, and metropolitan planning organizations (MPOs) and approved by the United States Congress in 1995. The Intermodal Surface Transportation Efficiency Act (ISTEA) in 1991 established certain key routes such as the Interstate Highway System, be included. The act provided a framework to develop a National Intermodal Transportation System which "consists of all forms of transportation in

500-516: The system. In other cases, it may not be possible to use the proper number because the limited set of available numbers has been exhausted, causing a "non-standard" number to be used. A spur route 's number usually has an odd number for its first digit. It is usually one of the following: Examples include: Sometimes, a three-digit Interstate Highway branches off from another three-digit Interstate Highway. These spurs do not connect directly with their parent highways, but are associated with them via

525-472: The three-digit highways they do intersect with. Examples include: A bypass route may traverse around a city, or may run through it with the mainline bypassing. In a typical 3-digit Interstate Highway, bypasses usually have both its two termini junctioned with another Interstate highway. Bypass routes are preceded by an even number in the first digit. Examples include: In the case of an auxiliary Interstate highway which has both ends at Interstates but not

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550-407: Was originally signed as SR 243. There are plans to extend it to SR 1 further south in Orange County as SR 605, but strong community opposition means that it is unlikely that the alignment will ever be built. In 2020, there was a proposal to widen I-605, which would have added four new lanes to 12 mi (19 km) of I-605 between Norwalk and El Monte, California . This proposal

575-408: Was proposed as I-13, as it is positioned approximately midway between I-5 and I-15 (although it intersects the former). That number was rejected, as was the second proposed number, I-102. Finally, the designation I-605 was accepted in 1958. I-605 began construction in 1963 and the first section was opened in 1964 from I-405 to SR 60 . The newest section (extension to I-210 ) was opened in 1971

600-520: Was rejected due to strong community opposition, in particular due to the fact that it would have led to the destruction of houses in Downey, California . List of auxiliary Interstate Highways Auxiliary Interstate Highways (also called three-digit Interstate Highways ) are a subset of highways within the United States' Interstate Highway System . The 323 auxiliary routes generally fall into three types: spur routes , which connect to or intersect

625-527: Was signed into law by President Bill Clinton on November 28, 1995. The legislation designated about 160,955 miles (259,032 km) of roads, including the Interstate Highway System, as the NHS. Aside from designating the system, the act served several other purposes, including restoring $ 5.4 billion in funding to state highway departments, giving Congress the power to prioritize highway system projects, repealing all federal speed limit controls, and prohibits

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