California State Route 78

State Route 78
SR 78 highlighted in red
Route information
Maintained by Caltrans
Length	215.39 mi[1] (346.64 km)
Existed	1934[2]–present
Tourist routes	Anza-Borrego Desert State Park Road[3]
Major junctions
West end	I-5 in Oceanside
Major intersections	I-15 in Escondido SR 67 in Ramona SR 79 from Santa Ysabel to Julian SR 86 from near Kane Spring to near Brawley SR 111 in Brawley
East end	I-10 near Blythe
Location
Country	United States
State	California
Counties	San Diego, Imperial, Riverside
Highway system
State highways in California Interstate US State Scenic History Pre‑1964 Unconstructed Deleted Freeways
← SR 77 → SR 79

State Route 78 (SR 78) is a state highway in the U.S. state of California that runs from Oceanside east to Blythe, traversing nearly the entire width of the state. Its western terminus is at Interstate 5 (I-5) in San Diego County and its eastern terminus is at I-10 in Riverside County. The route is a freeway through the heavily populated cities of northern San Diego County and a two-lane highway running through the Cuyamaca Mountains to Julian. In Imperial County, SR 78 travels through the desert near the Salton Sea and passes through the city of Brawley and the Algodones Dunes before turning north on the way to its terminus in Blythe.

SR 78 was one of the original state highways designated in 1934, although portions of the route existed as early as 1900. However, it was not designated east of Brawley until 1959. The freeway section in the North County of San Diego that connects Oceanside and Escondido was built in the middle of the twentieth century in several stages, including a transitory stage known as the Vista Way Freeway, and has been altered several times. An expressway bypass of the city of Brawley was completed in 2012. There are many projects slated to add capacity to the freeway due to increasing congestion in the region.