California State Route 154

State Route 154 (SR 154) (also known as the Chumash Highway or unofficially as San Marcos Pass Road after the signage) is a state highway in the U.S. state of California that runs from Los Olivos to Santa Barbara, crossing the San Marcos Pass in the Santa Ynez Mountains. Before U.S. Route 101 was built through the Gaviota Pass, SR 154 was the main throughway to Santa Barbara and the tri city area including use as a stagecoach route in early years. After being replaced by US 101 as the primary route between the Santa Ynez Valley and Santa Barbara, SR 154 now serves as a scenic bypass.

State Route 154

SR 154 highlighted in red
Route information
Maintained by Caltrans
Length32.30 mi (51.98 km)
Tourist
routes
San Marcos Pass Road
RestrictionsNo hazardous material along the segment through the San Marcos Pass between SR 246 and US 101
Major junctions
West end US 101 near Los Olivos
Major intersections
East end US 101 in Santa Barbara
Location
CountryUnited States
StateCalifornia
CountiesSanta Barbara
Highway system
  • State highways in California
  • Interstate
  • US
  • State
  • Scenic
  • History
  • Preโ€‘1964
  • Unconstructed
  • Deleted
  • Freeways
โ† SR 153โ†’ SR 155
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