Interstate 805

Interstate 805
Jacob Dekema Freeway
I-805 highlighted in red
Route information
Auxiliary route of I-5
Maintained by Caltrans
Length	28.016 mi[1] (45.087 km)
Existed	1959[2]–present
NHS	Entire route
Major junctions
South end	I-5 in San Ysidro
Major intersections	SR 905 in Otay Mesa SR 54 in National City SR 94 in San Diego SR 15 in San Diego I-8 in Mission Valley SR 163 in Clairemont SR 52 in University City
North end	I-5 in Sorrento Valley
Location
Country	United States
State	California
Counties	San Diego
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-780 → I-880

Interstate 805 (I-805) is a major north–south auxiliary Interstate Highway in Southern California. It is a bypass auxiliary route of I-5, running roughly through the center of the Greater San Diego region from San Ysidro (part of the city of San Diego) near the Mexico–U.S. border to near Del Mar. The southern terminus of I-805 at I-5 in San Ysidro is less than 1 mi (1.6 km) north of the Mexican border. I-805 then traverses the cities of Chula Vista and National City before reentering San Diego. The freeway passes through the San Diego neighborhoods of North Park, Mission Valley, Clairemont, and University City before terminating at I-5 in the Sorrento Valley neighborhood near the Del Mar city limit.

Planning for I-805 began in 1956, and the route was officially designated in 1959 before it was renumbered in the 1964 state highway renumbering. Starting in 1967, the freeway was built in phases, with the northern part of the freeway finished before the southern part. I-805 was completed and open to traffic in 1975. Named the Jacob Dekema Freeway after the longtime head of the regional division of the California Department of Transportation (Caltrans), I-805 has been frequently cited for its complex engineering and architecture, including near I-8 on the Mission Valley Viaduct. Since then, several construction projects have taken place, including the construction of carpool lanes.