Interstate 605

Interstate 605
San Gabriel River Freeway
I-605 highlighted in red
Route information
Auxiliary route of I-5
Maintained by Caltrans
Length	27.40 mi[1] (44.10 km)
History	1940s as a state highway, 1964 as a number[2]
NHS	Entire route
Major junctions
South end	I-405 / SR 22 in Seal Beach
Major intersections	SR 91 in Cerritos I-105 in Norwalk I-5 in Santa Fe Springs SR 72 in Whittier SR 60 in Avocado Heights I-10 in Baldwin Park I-210 in Irwindale
North end	Huntington Drive in Duarte
Location
Country	United States
State	California
Counties	Orange, Los Angeles
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future State highways in California Interstate US State Scenic History Pre‑1964 Unconstructed Deleted Freeways
← I-580 → I-680

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 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.