Interstate 805: Wikis


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Interstate 805 shield
Interstate 805
Auxiliary route of the Interstate Highway System
Jacob Dekema Freeway
Defined by S&HC § 621, maintained by Caltrans
Length: 28.016 mi[1] (45.087 km)
South end: I-5 in San Ysidro
I-8 in San Diego
North end: I-5 near Del Mar
State highways in California (list - pre-1964)
< I-780 I-880 >
History - Unconstructed - Deleted - Freeway - Scenic
The "5/805 Split", during evening rush hour. This is the beginning of I-805 South. When heading Northbound, the location where 805 ends is called the "5/805 merge."

Interstate 805 (I-805, and colloquially referred to as "the eight-oh-five") is a major north–south Interstate Highway in Southern California. It is a bypass of Interstate 5, running along the eastern areas of the Greater San Diego area from San Ysidro near the Mexico–U.S. border to near Del Mar. It is officially known as the Jacob Dekema Freeway after Jacob Dekema, a pioneering force from the California Department of Transportation (Caltrans) who helped shape the San Diego freeway system.

This route is part of the California Freeway and Expressway System[2].


Route description

Miramar Rd Overpass

I-805 is an alternate bypass route of Interstate 5. The southern terminus of I-805 is at I-5 less than a mile north of the United States–Mexico border in the San Diego district of San Ysidro. I-805 then goes through the cities of Chula Vista and National City before reentering San Diego. The freeway then passes though the San Diego neighborhoods of North Park, Mission Valley, Clairemont, and University City before terminating at I-5 in Sorrento Valley.

Eight to ten lanes throughout, Interstate 805 has evolved into a busy commuter route from the International Border into the exploding South Bay communities of Chula Vista (including Rancho del Rey and Eastlake) and National City. The freeway also leads into the relatively new business parks near University City (via Governor Drive and La Jolla Village Drive) and Sorrento Valley. As more companies locate along the route of Interstate 805, more traffic utilizes the route as an important connector to get from home to work. In addition to commuter traffic, the freeway is one of two north–south freeways that reach Mexico. Traffic to and from the border is also very common along Interstate 805.

I-805 also includes a towering bridge over Mission Valley and Interstate 8, including San Diego County's only symmetrical stack interchange. The Jack Schrade Interchange includes the Mission Valley Viaduct, a towering reinforced concrete viaduct built in 1972.[3] The viaduct conducts I-805 traffic over Mission Valley and the San Diego River. The interchange connects Interstate 805 with Interstate 8, which runs along the south side of Mission Valley and crosses underneath the viaduct perpendicularly. San Diego Trolley traffic also runs under the viaduct on the valley floor.


Plans for I-805 were passed in legislature in 1959 as Legislative Route Number 241. It was approved as a chargeable interstate in 1958, and declared a signed state route in 1964. The freeway was then built between 1970 and 1975.

A major expansion of the 805-5 merge zone was opened to traffic on April 3rd, 2007. Including HOV Lanes and local bypass lanes, this merge spans 22 lanes at the widest point. Work is also underway to add two HOV Lanes between State Route 52 and Mira Mesa Boulevard.

As of 2007, a three-year project is underway to allow robot controlled vehicles, including buses and trucks, to use a special lane. The intention is to allow the vehicles to travel at shorter following distances and thereby allow more vehicles to use the lanes. The vehicles will still have drivers since they need to enter and exit the special lanes. The system is being designed by Swoop Technology, based in San Diego county.[4]

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 entire route is in San Diego County.

Location Postmile
#[7] Destinations Notes
San Diego 0.49 Mexico only (San Diego Freeway, I-5 south) Southbound exit and northbound entrance
Camino de la Plaza Southbound exit and northbound entrance
0.65 1A San Ysidro Boulevard
1.81 1B SR 905
2.90 2 Palm Avenue
Chula Vista 3.65 3 Main Street, Auto Park Drive
4.42 4 Olympic Parkway, East Orange Avenue
6.06 6 L Street, Telegraph Canyon Road
7.16 7 H Street Signed as exits 7A (east) and 7B (west) southbound
7.76 7C E Street, Bonita Road (CR S17) Northbound exit is part of exit 7
8.85 8 SR 54 Signed as exit 9 southbound
National City 9.05 9 Sweetwater Road Signed as exit 8 southbound
10.28 10 Plaza Boulevard
San Diego 11.31 11A 43rd Street Signed as exit 11B southbound; former SR 252
R11.36 11B 47th Street, Palm Avenue – National City Signed as exit 11A southbound
12.34 12A Imperial Avenue
12.95 12B Market Street
13.51 13A SR 94 (M. L. King Jr. Freeway) Southbound exit to SR 94 west is via exit 14
13.95 13B Home Avenue
14.64 14 SR 15 north (Escondido Freeway) Northbound exit and southbound entrance
14.64 14 SR 15 south (Escondido Freeway) Southbound exit and northbound entrance
15.95 15 North Park Way, University Avenue
16.43 16 El Cajon Boulevard
16.99 17A Adams Avenue, Madison Avenue Southbound exit and northbound entrance
17.65 17B I-8  – Beaches, El Centro Signed as exit 17 northbound
18.89 18 Murray Ridge Road, Phyllis Place
20.23 20A Mesa College Drive, Kearny Villa Road Northbound exit and southbound entrance
20.60 20B SR 163 north (Cabrillo Freeway) – Escondido Northbound exit and southbound entrance
20.60 20 SR 163 south (Cabrillo Freeway) – Downtown San Diego Southbound exit and northbound entrance
21.65 21 Balboa Avenue Former SR 274
22.56 22 Clairemont Mesa Boulevard
23.65 23 SR 52
24.44 24 Governor Drive
25.48 25A Nobel Drive Northbound exit and southbound entrance
25.94 25B La Jolla Village Drive, Miramar Road
27.07 27 Mira Mesa Boulevard, Vista Sorrento Parkway, Sorrento Valley Road Signed as exits 27A (Mira Mesa Boulevard, Vista Sorrento Parkway) and 27B (Sorrento Valley Road) northbound
SR 56 east Northbound exit and southbound entrance; exit is accessible via Local Bypass
28.50 I-5 north (San Diego Freeway) – Los Angeles Northbound exit and southbound entrance


External links



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