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| California State Route 178 | |
|---|---|
| State | CA |
| Type | State Route |
| Route | 178 |
| Length mi | 111.26 |
| Established | 1934 |
| Direction a | West |
| Terminus a | San Bernardino |
| Direction b | East |
| Terminus b | Death Valley Junction |
| Counties | San Bernardino County, Kern County, Inyo County |
California State Route 178
California State Route 178 is a state highway in California connecting the San Bernardino Valley and Inyo County through the Kern River Canyon and into Death Valley National Park. The route links urban centers such as San Bernardino and Bakersfield with rural communities like Mojave, Lake Isabella, and Ridgecrest via mountain and desert corridors including the Sierra Nevada eastern foothills and the Mojave Desert. It serves as a regional connector for freight, tourism, and commuter traffic, intersecting major corridors such as Interstate 15, Interstate 40, and U.S. Route 395.
SR 178 begins in the western segment at an interchange with Interstate 215 and State Route 210 near downtown San Bernardino. Proceeding east, the highway follows the urban grid past landmarks including San Bernardino County Courthouse and the San Bernardino Transit Center before ascending toward the San Bernardino Mountains corridor. The route transitions to a four-lane divided arterial through suburban communities such as Fontana and near Rialto, intersecting major arterials like U.S. Route 66-adjacent alignments and providing connectivity to Los Angeles County corridors.
Continuing east, the highway traverses the San Bernardino National Forest approaches and descends into the Kern River watershed where it passes through Lake Isabella and the canyon communities historically linked to the Kern River gold rush. The route enters Kern County and the city of Bakersfield, where SR 178 runs concurrently with portions of State Route 99 and provides access to the Bakersfield Amtrak Station and industrial districts tied to the San Joaquin Valley transportation network.
East of Bakersfield, SR 178 climbs through the Kern River Canyon alongside sections of the Kern River and the Sequoia National Forest boundary, connecting to communities like Wofford Heights and Lake Isabella. Beyond the Sierra foothills, the highway crosses the Sierra Nevada rain shadow into the Mojave Desert, intersecting State Route 14 in the vicinity of Mojave and providing access to aviation facilities associated with Edwards Air Force Base and the Mojave Air and Space Port.
The eastern segment extends from the U.S. Route 395 junction near Inyokern and Ridgecrest eastward through the Inyo County deserts, traversing landscapes adjacent to Naval Air Weapons Station China Lake and terminating near Death Valley Junction, where connections serve visitors bound for Death Valley National Park and the Amargosa Valley.
The roadway that became SR 178 traces origins to early 20th-century wagon roads and U.S. Route 99-era alignments that facilitated access to mining camps, agricultural settlements, and military installations such as Fort Tejon and later China Lake Naval Air Weapons Station. The route was designated in the 1934 California highway renumbering, contemporaneous with statewide initiatives linking the Central Valley and southern California mountain passes. During the mid-20th century, improvements paralleled developments at Mojave Air and Space Port and in Bakersfield industrial expansion tied to the California oil industry and San Joaquin Valley commodity transport.
Significant construction phases included canyon realignments in the Kern River Canyon during the 1950s and 1960s to accommodate increasing automobile and commercial truck traffic associated with the postwar boom and the growth of Interstate 5 and State Route 99. In the late 20th century, safety upgrades were implemented after incidents prompting collaborations among agencies including California Department of Transportation and county governments. The eastern desert segment has historical ties to Tonopah and Tidewater Railroad corridors and to routes used during the 20th-century American mining boom, and it gained renewed importance for tourism to Death Valley following designation of parks and National Park Service initiatives.
- Western terminus: interchange with I-215 / SR 210 near San Bernardino - Junction with I-15 serving Victor Valley and Las Vegas - Connections with historic U.S. Route 66 corridors and urban arterials in San Bernardino County - Concurrency and interchange with SR 99 in Bakersfield - Interchange with I-5-linked freight corridors via SR 99 connections serving the Central Valley - Junction with SR 14 near Mojave, linking to Lancaster and Palmdale - Intersection with US 395 near Inyokern / Ridgecrest - Eastern terminus vicinity: access to Death Valley National Park and Amargosa Valley
Planned improvements have been discussed by California Department of Transportation in coordination with Kern County and San Bernardino County agencies, focusing on safety upgrades in the Kern River Canyon and capacity enhancements near Bakersfield. Proposals include targeted widening, rockfall mitigation near canyon segments adjacent to Sequoia National Forest, and intersection improvements to support freight movements linked to Port of Los Angeles and Port of Long Beach supply chains. Environmental reviews have engaged stakeholders such as the National Park Service for sections impacting Death Valley National Park visitorship and the U.S. Fish and Wildlife Service where sensitive species habitats are present. Funding discussions reference mechanisms like California Transportation Commission allocations and regional measures administered by agencies including the Kern Council of Governments and the San Bernardino County Transportation Authority.
Several state and federal routes intersect or run concurrent with SR 178 corridors, including SR 99, SR 14, US 395, I-215, and I-15. Historic roadways with shared heritage include U.S. Route 66 alignments and segments once served by the Tonopah and Tidewater Railroad. Designations affecting the highway have included inclusion on state scenic or touring route lists discussed by agencies such as the California Scenic Highway System advocates and regional tourism entities like Visit California. County routes and local connectors such as those administered by Kern County, Inyo County, and San Bernardino County provide feeder access to municipal centers like Bakersfield and San Bernardino.