 State Route 54 | ||||
|---|---|---|---|---|
 SR 54 highlighted in red | ||||
| Route information | ||||
| Maintained by Caltrans and San Diego County | ||||
| Length | 14.212 mi[1] (22.872 km) | |||
| Existed | 1961–present | |||
| Western section | ||||
| West end |  I-5 in National City | |||
| Major intersections |
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| East end |  SR 125 near Spring Valley | |||
| Eastern section | ||||
| West end |  SR 94 in Rancho San Diego | |||
| East end | El Cajon city limit | |||
| Location | ||||
| Country | United States | |||
| State | California | |||
| Counties | San Diego | |||
| Highway system | ||||
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State Route 54 (SR 54) is a state highway in the U.S. state of California that consists of two segments in San Diego County. The westernmost part of the highway is known as the South Bay Freeway, beginning at Interstate 5 (I-5) in National City and running along the Sweetwater River before ending at the intersection with SR 125 and Jamacha Boulevard near Spring Valley. SR 54 then resumes at SR 94 in Rancho San Diego as an undivided highway that leads to the city limits of El Cajon. County Route S17 (CR S17) connects the two portions of the highway; the center portion of SR 54 was never constructed.
The first section of the freeway opened in 1963, east of I-805. The extension of the freeway west to I-5 was delayed to coincide with the construction of the Sweetwater River flood channel. While construction started in 1984, a court stopped the process for a few years, and this portion was not complete until 1992. The final section of freeway, which was upgraded from an expressway, opened in 2007, to coincide with the extension of SR 125 south to Otay Mesa.