Duncanson-Harrelson Co.

of San Francisco, California
Bay Farm Island Bridge (Alameda County, California)
Built 1953
Bascule bridge over San Leandro Bay on CA 61 in Alameda
Open to traffic

Georgiana Slough Bridge (Sacramento County, California)
General Contractor, 1962
Bridge over Georgiana Slough on Isleton Road
Open to traffic

No-Hands Bridge (Placer County, California)
Contractor, 1912
Closed-spandrel Reinforced concrete arch bridge over North Fork American River
Open to pedestrians & horses