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| Route 111 (California) | |
|---|---|
| State | CA |
| Type | SR |
| Route | 111 |
| Length mi | 81.114 |
| Established | 1934 |
| Direction a | South |
| Terminus a | Mexicali |
| Direction b | North |
| Terminus b | Palm Springs |
| Counties | Imperial County, Riverside County |
Route 111 (California) is a state highway in California running from the international border near Mexicali northward through the Imperial Valley, along the eastern shore of the Salton Sea, and into the Coachella Valley terminating at Palm Springs. The route connects agricultural centers, recreational destinations, and desert communities while intersecting major corridors and facilitating cross-border commerce, tourism, and regional commuting between San Diego County and inland Riverside County corridors.
Route 111 begins at the international crossing adjacent to Mexicali, linking to local roads that serve the Valle de Mexicali and the NAFTA trade network; it proceeds northwest through Calexico where it intersects with Interstate 8. Traveling through the Imperial Valley, the highway passes near the All-American Canal and through agricultural towns such as El Centro and Brawley, providing access to Imperial County orchards, USDA irrigation projects, and Anza-Borrego Desert State Park feeder roads. North of Brawley the route skirts the eastern shore of the Salton Sea past Salton City, Niland, and Calipatria, offering connections to State Route 86 and the Interstate 10 corridor via Coachella Valley, before ascending into the Coachella Valley communities of Thermal, La Quinta, Indio, Cathedral City, and finally reaching central Palm Springs. The alignment traverses flat desert basin, saline shoreline, and alluvial fan margins, intersecting rail spurs of the Union Pacific Railroad and crossing local flood control channels tied to Colorado River diversion systems.
The corridor originated as a series of county roads and stagecoach routes linking Yuma and San Diego region settlements during the late 19th and early 20th centuries, paralleling irrigation projects by entities like the Imperial Irrigation District. By the 1930s the roadway was incorporated into the state highway system during the era of New Deal infrastructure investment connected to programs overseen by agencies such as the Works Progress Administration and the Bureau of Reclamation. Mid-20th century improvements tied the route to postwar development and tourism booms centered on Palm Springs and Coachella Valley resorts, catalyzed by celebrities and events associated with names like Frank Sinatra, Bob Hope, and Dinah Shore who popularized desert resorts. Environmental and seismic considerations arose with salinity increases in the Salton Sea and tectonic activity along the San Andreas Fault, prompting engineering studies from institutions such as the California Department of Transportation and collaborations with United States Geological Survey scientists. In recent decades the corridor’s role in cross-border trade and renewable energy projects—linked to developers and agencies including California Energy Commission—has driven planning initiatives and federal grant applications.
The highway intersects multiple federal, state, and local routes: at its southern end it connects to border infrastructure serving Mexicali and regional trade routes to Tijuana via linking corridors; near Calexico it meets Interstate 8, providing access toward San Diego and El Centro. The route crosses SR 86 in the Coachella Valley, interfaces with Interstate 10 near Indio, and intersects arterial streets and county routes that lead to Joshua Tree National Park and Anza-Borrego Desert State Park. Along the Salton Sea shore it joins feeder roads to Slab City and Salvation Mountain, and in Palm Springs it terminates at junctions serving downtown destinations, the regional airport near Palm Springs International Airport, and transit hubs connected to Metrolink and SunLine Transit Agency services.
Planned projects include pavement rehabilitation and safety upgrades funded through state transportation programs and federal grants administered by the California Transportation Commission and Federal Highway Administration. Proposals address shoreline stabilization near the Salton Sea coordinated with environmental agencies such as the California Natural Resources Agency and mitigation plans involving the California Air Resources Board due to dust emissions. Local governments in Imperial County and Riverside County coordinate with entities like the Metropolitan Water District of Southern California on flood control and right-of-way adjustments, while regional transit agencies evaluate bus rapid transit and enhanced commuter connections tied to Coachella Valley Association of Governments planning efforts. Renewable energy development in the corridor has prompted permitting reviews by the Bureau of Land Management and the California Energy Commission affecting access and potential roadway improvements.
Portions of the corridor carry commemorative names and have special signage recognizing regional heritage, including markers referencing Imperial Valley pioneers, Native American tribal lands of the Cahuilla people, and historic routes used during early 20th-century land development. Wayfinding signage integrates with tourism branding for destinations like Salton Sea National Wildlife Refuge and Joshua Tree National Park access points, and regulatory signage reflects standards from the Manual on Uniform Traffic Control Devices used statewide. Maintenance and signage programs are coordinated through the California Department of Transportation in partnership with county public works departments and regional tourism bureaus.
Category:State highways in California Category:Transportation in Imperial County, California Category:Transportation in Riverside County, California