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

Interstate 605 marker

Interstate 605
San Gabriel River Freeway
I-605 highlighted in red
Route information
Auxiliary route of I-5
Defined by Streets and Highways Code § 619
Maintained by Caltrans
Length27.40 mi[2] (44.10 km)
History1940s as a state highway, 1964 as a number[1]
Major junctions
South end SR 22 / I-405 in Seal Beach
North end I-210 / Huntington Dr. in Duarte
CountiesOrange, Los Angeles
Highway system

Though this does not include the improvements with the interchange with I-105 (which did not open until the mid 1990s), reconstruction of I-10 between I-605 and I-405, 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.


Route descriptionEdit

The California Streets and Highways Code defines Route 605 as "(a) Route 1 near Seal Beach to Route 405. (b) Route 405 to Route 210 near Duarte." However, the portion in subsection A has yet to be constructed.

The southern terminus of I-605 is at the San Diego (I-405) and Garden Grove (State Route 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 the Foothill Freeway, (I-210) in Duarte, a small city located at the foothills of the San Gabriel Mountains.

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 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 Interstate 10. There are no plans to extend it to Interstate 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 the older signs between the Orange County line and Interstate 10 in 2016, with the completion of the I-605 and I-10 junction improvement. Guide signs along I-605 never included 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 is part of the California Freeway and Expressway System,[3] and is part of the National Highway System,[4] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.[5] 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.[6]


Approaching the northern terminus of I-605

In 1957, the number for this route 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.[7]

Interstate 605 began construction in 1963 and the first section was opened in 1964 from Interstate 405 to Pomona Freeway CA 60. The newest section (extension to Interstate 210) was opened in 1971 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.[7]

Exit listEdit

OrangeSeal Beach0.000.001A  SR 22 west (7th Street) – Long BeachSouthern terminus; SR 22 exit 2
0.410.661B   I-405 south (San Diego Freeway) / SR 22 east (Garden Grove Freeway) – San Diego, Garden GroveFormer SR 7 south; I-405 north/SR 22 west exit 24
   I-405 south / SR 22 eastHOV access only; southbound exit and northbound entrance
0.410.661C  I-405 north (San Diego Freeway) – Santa MonicaSigned as exit 1A northbound; former SR 7 north; I-405 south exit 24A
Los Alamitos1.412.271DKatella Avenue – Los AlamitosSigned as exit 1B northbound
1.692.722AWillow StreetSigned as exit 1B northbound
Los AngelesLong Beach1.933.112BSpring Street / Cerritos AvenueSouthbound exit and northbound entrance
3.385.443Carson Street / Lincoln Avenue – Hawaiian GardensFormer US 91 and SR 18
Cerritos4.517.265ADel Amo Boulevard – Lakewood
5.398.675BSouth Street
6.6910.777A  SR 91 (Artesia Freeway) – Beach Cities, Riverside
Norwalk7.4511.997BAlondra Boulevard
8.5013.689ARosecrans Avenue
9.2914.959B  I-105 west (Century Freeway) – El SegundoI-105 east exits 18A-B
9.2914.959CImperial HighwaySigned as exit 9B southbound; former SR 90
9.5315.3410Firestone BoulevardFormer SR 42
Santa Fe Springs11.2518.1111Florence Avenue – Downey
11.2518.1111  I-5 (Santa Ana Freeway) – Los Angeles, Santa AnaFormer US 101 Byp. south; I-5 exit 124
11.8919.1412Telegraph Road – Santa Fe SpringsFormer US 101 Byp. north; former SR 26
West Whittier-Los Nietos13.1821.2113Slauson Avenue
13.6922.0314Washington Boulevard – Pico RiveraSigned as exits 14A (west) and 14B (east) southbound
Whittier15.2124.4815  SR 72 (Whittier Boulevard) – WhittierFormer US 101
Pico Rivera16.0525.8316Beverly BoulevardSouthbound exit to Beverly Boulevard west is via exit 17.
17.2127.7017Rose Hills Road
Industry18.2929.4318Peck Road
19.0530.6619  SR 60 (Pomona Freeway) – Los Angeles, PomonaSR 60 exit 12
21.0333.8421Valley Boulevard – IndustryFormer US 60 and SR 212
Baldwin Park21.8335.1322  I-10 (San Bernardino Freeway) – Los Angeles, San BernardinoFormer US 99 / US 70 / US 60; I-10 east exits 31A-B, south exit 31A
22.7136.5523Ramona Boulevard – Baldwin Park, El MonteFormer US 99
Irwindale23.7938.2924Lower Azusa Road / Los Angeles Street
25.1640.4925Live Oak Avenue – IrwindaleNorthbound exit and southbound entrance
26.6042.8126Arrow HighwaySouthbound exit and northbound entrance
27.4044.1027  I-210 (Foothill Freeway) – Pasadena, San BernardinoSigned as exits 27A (east) and 27B (west); no exit number southbound; I-210 east exit 36A, west exit 36B
Duarte27.5444.3227CHuntington Drive – DuarteNorthern terminus; at-grade intersection; former US 66
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See alsoEdit


  1. ^ "Los Angeles Highways". Archived from the original on November 15, 2011. Retrieved January 26, 2013. Cite uses deprecated parameter |deadurl= (help)
  2. ^ "Route Log and Finder List - Interstate System: Table 2". FHWA. Retrieved October 7, 2007.
  3. ^ "Article 2 of Chapter 2 of Division 1 of the California Streets and Highways Code". Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
  4. ^ Federal Highway Administration (March 25, 2015). National Highway System: Los Angeles, CA (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved July 29, 2017.
  5. ^ Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
  6. ^ California Department of Transportation; California State Transportation Agency (January 2015). 2014 Named Freeways, Highways, Structures and Other Appurtenances in California. Sacramento: California Department of Transportation. p. 83. Archived from the original (PDF) on May 30, 2015. Retrieved May 30, 2015.
  7. ^ a b Faigin, Daniel. "Interstate 605". California Highways. Retrieved September 23, 2016.
  8. ^ a b Warring, KS (April 18, 2008). "Interstate 605 Freeway Interchanges" (PDF). California Numbered Exit Uniform System. California Department of Transportation. Retrieved September 1, 2014.

External linksEdit