Napa County, California Bridges: Pratt Avenue Bridge across the Napa River

December 2013 (38.52074 Degrees, -122.47266 Degrees) Pratt Avenue Bridge

Continuing up the Napa Valley we arrived at the Pratt Avenue Bridge (21C0072) across the Napa River. The Napa River flows on the south side of the Silverado Trail and so bridges carrying traffic into the Napa Valley have their north abutment at the intersection with the Silverado Trail (see bottom photo).

The Pratt Avenue Bridge is a T girder bridge built in 1921. It is composed of two continuous 57 ft spans supported on a decorative pier wall and end diaphragm abutments. The exterior girders are big and the interior girders are small (see photo above). Perhaps the exterior girders are meant to support the intermediate diaphragms, which support the interior girders. The deck is only 19 ft wide, it carries about 1000 vehicles a day, and it's in satisfactory condition.

Napa County, California Bridges: Pratt Avenue Bridge across the Napa River by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.