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Interstate 605 (abbreviated I-605, and colloquially referred to as the 605 or the six-oh-five) is a major north-south Interstate Highway in the Greater Los Angeles Area of Southern California. It is about 27 miles (43 km) in length, and runs from Seal Beachmarker to Irwindalemarker, closely paralleling the San Gabriel River for most of its alignment. Thus, it is officially known as the San Gabriel River Freeway, one of the few Southern California freeways not named after a city along its route.

This route is part of the California Freeway and Expressway System.

Route description

The southern terminus of I-605 is at the San Diego (I-405) and Garden Grove (State Route 22) Freeways in Seal Beachmarker. 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 Duartemarker, a small city located at the foothills of the San Gabriel Mountainsmarker.

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. Also, the freeway features an HOV lane for carpools of two or more people throughout most of the route.

Signs along I-605's entrances and freeway junctions do not include destinations (control cities) such as "Seal Beachmarker" or "Irwindalemarker", but simply read "NORTH" or "SOUTH" — a rarity in Southern California. In place of control cities, a simple "THRU TRAFFIC" designation is used.

Route 605 from Route 405 to Route 10 is known as the San Gabriel River Freeway, as named by Senate Bill 99, Chapter 1101 in 1967.

Other names
  • The I-605/I-105 interchange is known as the Joe A. Gonsalves Memorial Interchange, as named by Assembly Bill 96, Chapter 129 in 2001. Gonsalves became the first person of Portuguesemarker ancestry to become a member of the California State Legislature in 1962


Metro Express line 577 runs through Interstate 605 between Interstate 10 and Interstate 405. The Green Line serves the Norwalk Station at the interchange of the eastern terminus of Interstate 105.


Interstate 605 began construction and the first section was opened in 1964 from Interstate 405 to Interstate 10. The newest section (extension to the Interstate 210) was opened in 1971 was originally signed as SR 243. Originally it was planned as I-13 running from Interstate 5 to I-15. There are plans to extend it to SR 1 further south in Orange County, however due to strong community opposition this is unlikely that the alignment will ever be built.

Exit list

Note: Except where prefixed with a letter, postmiles were measured in 1964, based on the alignment as it existed at that time, and do not necessarily reflect current mileage. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.
County Location Postmile

# Destinations Notes

ORA 3.09-R1.64
Seal Beachmarker 3.09 1A Southbound exit and northbound entrance

1B Southbound exit and northbound entrance; former SR 7 south
1C Signed as exit 1A northbound; former SR 7 north
Los Alamitosmarker R1.41 1D Katella Avenue – Los Alamitosmarker Signed as exit 1B northbound
R1.41 2A Willow Street Signed as exit 1B northbound
Los Angeles

LA R0.00-25.76
Long Beachmarker R0.29 2B Spring Street, Cerritos Avenue Southbound exit and northbound entrance
R1.74 3 Carson Street, Lincoln Avenue
Cerritosmarker R2.87 5A Del Amo Boulevard – Lakewoodmarker
R3.75 5B South Street
R5.05 7A
Norwalkmarker R5.81 7B Alondra Boulevard
R6.81 9A Rosecrans Avenue
R7.65 9B
R7.85 9C Imperial Highway Signed as exit 9B southbound
R8.38 10 Firestone Boulevard Former SR 42
Santa Fe Springsmarker R9.35 11 Florence Avenue – Downeymarker
R9.61 11
R10.25 12 Telegraph Road – Santa Fe Springsmarker
R11.54 13 Slauson Avenue
R12.05 14 Washington BoulevardPico Riveramarker Signed as exits 14A (west) and 14B (east) southbound
Whittiermarker R13.57 15 , Whittiermarker
Pico Riveramarker R14.41 16 Beverly Boulevard, Whittier Southbound exit to Beverly Boulevard west is via exit 17
R15.57 17 Rose Hills Road
Industrymarker R16.65 18 Peck Road
R17.41 19
R19.39 21 Valley BoulevardIndustrymarker Former SR 212
Baldwin Parkmarker 20.19 22
21.07 23 Ramona BoulevardBaldwin Parkmarker, El Montemarker
Irwindalemarker 22.15 24 Lower Azusa Road, Los Angeles Street
23.52 25 Live Oak Avenue – Irwindalemarker Northbound exit and southbound entrance
23.96 26 Arrow Highway Southbound exit and northbound entrance
25.76 27 Signed as exits 27A (east) and 27B (west); no exit number southbound
Duartemarker 25.76 27C Huntington DriveDuartemarker At-grade intersection; former US 66


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