O.H. Buckman

Hardin Road Bridge (Napa County, California)
Built 1909
Stone arch bridge over Maxwell Creek on Hardin Road
Open to traffic

Horns Creek Bridge (Napa County, California)
Engineer, 1907
Stone arch bridge over Horns Creek on Private drive (formerly Silverado Trail)
Open to traffic, removed from public use when Silverado Trail realigned.

Trancas Street Bridge (Napa County, California)
Built 1908
Five-span stone arch bridge over Milliken Creek on Trancas Street in Napa
Open to traffic