State Route 58 (California)

State Route 58 (California)
State	CA
Type	SR
Route	58
Length mi	202.37
Direction a	West
Terminus a	near Santa Margarita
Direction b	East
Terminus b	in Barstow
Counties	San Luis Obispo, Kern, San Bernardino

State Route 58 (California) is a major east–west highway that links the Central Coast near Santa Maria, California and Paso Robles, California with the southern end of the Sierra Nevada and the western Mojave Desert near Barstow, California. The route serves as a vital freight and passenger corridor connecting the ports and rail yards around Los Angeles and Long Beach, California with the Central Valley and the Interstate 40 corridor toward Arizona and the Southwest United States. Managed by the California Department of Transportation, the highway traverses diverse terrain including coastal ranges, the Carrizo Plain, the Tehachapi Mountains, and the Antelope Valley.

Route description

The western segment begins near Santa Margarita, California and proceeds east through the Harris Grade toward San Luis Obispo County. It connects with US 101 near Templeton, California and passes close to Paso Robles, California and the Paso Robles Wine Country. Continuing east, the highway crosses the Carrizo Plain National Monument vicinity and intersects with California State Route 33 near McKittrick, California. Entering Kern County, California, the route approaches the Bakersfield, California metropolitan area, interchanging with Interstate 5, SR 46, and SR 99 before traversing the Tehachapi Pass and the Tehachapi Mountains.

The freeway-standard section over the Tehachapis is commonly called the Tehachapi Pass Wind Farm corridor and includes the modernized Bakersfield, California bypass and freeway through Tehachapi, California. After descending into the Antelope Valley, SR 58 links with Interstate 15 and proceeds toward Barstow, California, where it joins Interstate 40 and provides access to National Trails Highway and the historic Route 66 alignments. The roadway alternates between two-lane highway, expressway, and full freeway segments, facilitating freight movement between Port of Los Angeles/Port of Long Beach and Union Pacific Railroad and BNSF Railway transcontinental routes.

History

The corridor follows historic paths used during California's 19th-century expansion, paralleling routes associated with El Camino Real and wagon roads to the desert. Early 20th-century auto trails such as the Golden State Highway and alignments of U.S. Route 466 influenced SR 58's development. In the 1930s and 1940s, state highway designations evolved with the growth of U.S. Route 99 and the creation of the Interstate Highway System under the Federal-Aid Highway Act of 1956.

Major upgrades in the late 20th and early 21st centuries included freeway construction around Bakersfield, California, realignments over the Tehachapi Mountains, and interchange improvements near Barstow, California. Projects coordinated by the Kern Council of Governments, the San Luis Obispo Council of Governments, and the California Transportation Commission addressed congestion, seismic safety, and freight capacity, while environmental reviews invoked the National Environmental Policy Act and state equivalents. The route has been central to debates involving California High-Speed Rail project planning, regional freight logistics tied to the Port of Los Angeles and inland ports, and rural community access near Carrizo Plain.

Major intersections

SR 58 intersects several principal regional and national corridors, including: - Junction with US 101 near Templeton, California and access to San Luis Obispo, California. - Interchange with SR 46 toward Shandon, California and connections to California State Route 33. - Connections to Interstate 5 near Grapevine, California and Kern County, California freight routes. - Interchange with SR 99 and the Bakersfield, California metropolitan freeway network. - Crossing of Interstate 15 providing routes to Los Angeles and Las Vegas, Nevada. - Eastern terminus linkage with Interstate 40 in Barstow, California, proximate to Fort Irwin National Training Center and Mojave National Preserve.

Future developments

Planned improvements focus on completing freeway gaps, enhancing interchanges, and improving freight mobility linked to inland port proposals and regional logistics plans from the Southern California Association of Governments and Kern Council of Governments. Projects under environmental review or construction aim to widen expressway segments, modernize the Tehachapi crossing, and upgrade pavement and seismic resilience following Bridge and highway safety standards promulgated by federal and state agencies. Discussions involve coordination with California High-Speed Rail Authority alignments, potential truck bypasses near Bakersfield, California, and multimodal connections to Central Valley rail terminals and Logistics parks.

Auxiliary routes and spurs

SR 58 has related connectors and business routes that link the mainline to urban centers and freight facilities. These include business loops through Bakersfield, California, spurs to industrial zones near Arvin, California and Shafter, California, and short state-maintained connectors providing access to California State Route 99 and local intermodal facilities. Auxiliary infrastructure improvements are often integrated with county planning efforts from San Bernardino County, Kern County, and San Luis Obispo County authorities.

Category:State highways in California Category:Transportation in Kern County, California Category:Transportation in San Luis Obispo County, California Category:Transportation in San Bernardino County, California