Thomas & Post

Black Canyon Road Bridge (San Diego County, California)
Design Firm, 1913
Open spandrel Concrete arch bridge over Santa Ysabel Creek on Black Canyon Road
Bypassed and kept open to pedestrians only

Parks Bar Bridge (Yuba County, California)
Engineering Firm, 1913
Open-spandrel arch bridge over Yuba River on CA 20
Replaced in 1993 and destroyed.

Rowdy Creek Bridge (Del Norte County, California)
Design Firm, 1913
Lost Concrete deck girder bridge over Rowdy Creek on Fred D. Haight Drive
Replaced by new bridge