Thomas & Post
Black Canyon Road Bridge
(San Diego County, California)Design Firm, 1913Open spandrel Concrete arch bridge over Santa Ysabel Creek on Black Canyon RoadBypassed and kept open to pedestrians only
Parks Bar Bridge (1913)
(Yuba County, California)Engineering Firm, 1913Lost open-spandrel arch bridge over Yuba River on CA 20Replaced in 1993 and destroyed.
Rowdy Creek Bridge
(Del Norte County, California)Design Firm, 1913Lost Concrete deck girder bridge over Rowdy Creek on Fred D. Haight DriveReplaced by new bridge