.svg)  Interstate 15 and State Route 15 | ||||
|---|---|---|---|---|
 I-15 highlighted in red, SR 15 in purple | ||||
| Route information | ||||
| Maintained by Caltrans | ||||
| Length | 295.37 mi[1][a] (475.35 km) | |||
| Existed | 1957–present | |||
| Component highways | ||||
| Major junctions | ||||
| South end |  I-5 / 32nd Street / Norman Scott Road in San Diego | |||
| North end |  I-15 at Nevada state line in Primm, NV | |||
| Location | ||||
| Country | United States | |||
| State | California | |||
| Counties | San Diego, Riverside, San Bernardino | |||
| Highway system | ||||
| ||||
Route 15, consisting of the contiguous segments of State Route 15 (SR 15) and Interstate 15 (I-15), is a major north–south state highway and Interstate Highway in the U.S. state of California, connecting San Bernardino, Riverside, and San Diego Counties. The route consists of the southernmost 289.24 miles (465.49 km)[2] of I-15, which extends north through Nevada, Arizona, Utah, Idaho, and Montana to the Canada–US border. It is a major thoroughfare for traffic between San Diego and the Inland Empire, as well as between Southern California, Las Vegas, Nevada, and the Intermountain West.
South of its junction at I-8 in San Diego, the highway becomes SR 15, extending 6.13 miles (9.87 km)[1] to I-5, about 12 miles (19 km) from the Mexico–United States border. This segment was initially signed as a state route instead of an Interstate, but it is being upgraded to Interstate standards so it would become part of I-15 in the future. Including this segment, the entire length of Route 15 is 295.37 miles (475.35 km)[1] in California.
I-15 has portions designated as the Escondido Freeway, Avocado Highway, Temecula Valley Freeway, Corona Freeway, Ontario Freeway, Barstow Freeway, CHP Officer Larry L. Wetterling and San Bernardino County Sheriff's Lieutenant Alfred E. Stewart Memorial Highway, or Mojave Freeway.
- ^ a b c California Department of Transportation (July 2007). "Log of Bridges on State Highways". Sacramento: California Department of Transportation.
- ^ Federal Highway Administration (October 31, 2002). "Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of October 31, 2002". Route Long and Finder List. Federal Highway Administration. Retrieved November 29, 2011.
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