California References
U.S. Numbered Highway 66 in Los Angeles - by Jim Powell, Founder, Route 66 Association of Missouri
National Trails Highway – Route 66 - San Bernardino County Department of Public Works
California Route 66 Corridor Management Plan - California Historic Route 66 Association and the California Desert District of the Bureau of Land Management
Arroyo Seco Parkway - California's First Freeway - ASCE Region 9 History & Heritage Committee
Colorado Street Bridge - ASCE Region 9 History & Heritage Committee
Old Trails Bridge - ASCE Region 9 History & Heritage Committee
Cajon Pass - Wikipedia
State Route 66 - cahighways.org
National Trails Highway at 10 Bridges Project-Final EIR/EA - Caltrans/San Bernardino County
Database of Historic Bridges in California - Jim Ross
Proposed 2026 Plaque Unveiling Ceremony - ASCE Los Angeles Life Member Forum