Why you should experience Sierra Highway in Los Angeles, California.
Sierra Highway is a dynamic corridor where Newhall's transportation heritage, railroad history, commercial development, and gateway role into the Antelope Valley define one of northern Los Angeles County's most historically significant roadways.
Running through Newhall between Canyon Country and Castaic Junction, the corridor connects historic business districts, civic institutions, neighborhood centers, parks, schools, and regional transportation routes that collectively reflect more than a century of development across the Santa Clarita Valley. Historic storefronts, mature street trees, commercial corridors, civic spaces, and carefully maintained infrastructure preserve a roadway shaped by successive generations of regional growth. Businesses, community organizations, educational institutions, municipal agencies, and local residents continue reinforcing Sierra Highway's importance while supporting commerce, mobility, and civic life throughout Santa Clarita. The result is an experience defined by transportation history, regional connectivity, and the enduring character of Newhall.
What you should know about Sierra Highway.
Sierra Highway is best known for serving as Southern California's principal overland route to the Antelope Valley before construction of State Route 14, following a transportation corridor established during the nineteenth century that incorporated portions of El Camino Viejo, the inland route linking Los Angeles with California's Central Valley. The highway closely follows the alignment created after the Southern Pacific Railroad opened through Soledad Canyon in 1876, including completion of the 3,694-foot Lang Tunnel, an engineering project that accelerated settlement, mining, agriculture, and commerce throughout the Upper Santa Clara River Valley. The corridor also reflects development associated with the approximately 48,612-acre Rancho San Francisco, granted in 1839 by Governor Juan Bautista Alvarado to Antonio del Valle, whose family established the Rancho Camulos headquarters that became one of California's best-known ranch properties. Sierra Highway remained part of U.S. Route 6 from 1937 until the Antelope Valley Freeway gradually assumed long-distance traffic beginning in the 1960s, preserving its importance as the historic commercial spine of Newhall and neighboring communities.
William S. Hart Park, established following actor William S. Hart's death in 1946, preserves his ranch house, Western art collection, historic barns, and museum immediately adjoining Sierra Highway, reflecting the corridor's longstanding association with California's motion picture heritage. The Newhall Pass, crossed by Sierra Highway before modern freeway construction, served stagecoaches, freight wagons, and early motorists traveling between the Los Angeles Basin and the Santa Clarita Valley, making the roadway a continuous transportation corridor across multiple eras. The Pioneer Oil Refinery, constructed in 1876 near present-day Sierra Highway and designated California Historical Landmark No. 172, commemorates California's first commercially successful oil refinery and the petroleum industry that contributed to the region's economic development. The Newhall Metrolink Station, opened in 1991 along the historic Southern Pacific alignment served by Sierra Highway, continues linking Santa Clarita with Downtown Los Angeles through commuter rail infrastructure rooted in the corridor's nineteenth-century transportation history.
How to fold Sierra Highway into your trip.
Sierra Highway is best experienced as an exploration of Santa Clarita's transportation history, Western heritage, and early industrial development.
Begin at William S. Hart Museum, where preserved ranch buildings, fine art, and film memorabilia introduce the cultural legacy that developed alongside Sierra Highway before following the corridor through historic Newhall. Continue to Pioneer Oil Refinery, where interpretive displays and the preserved archaeological site explain California's earliest commercial petroleum refining operations and their influence on the surrounding valley. Conclude at Newhall Metrolink Station, where active commuter rail service occupies the historic railroad corridor that shaped Sierra Highway's development for nearly a century and a half. The progression moves naturally from cultural history to early industry before concluding with enduring transportation infrastructure, revealing why Sierra Highway continues expressing the enduring identity of Newhall.
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