This segment of Route 154 is often referred to as a 'Blood Alley'. (Source: Gribblenation, 'California State Route 150 family of highways (CA 246, CA 154, CA 192 and CA 150)', visited on ) Previous toīeing realigned Route 150 and later Route 154 used Stagecoach Road to
Significantly straightened the approach to San Marcos Pass. In 1964, Route 154 was realigned onto the Cold Springs Arch Bridge which This routing is unchanged from its 1963 definition.
