Tassajara Road Bridge
The Tassajara Road Bridge replaces an existing 2-lane road over a pipe culvert and will facilitate significant ecological stream improvement and increased vehicular capacity. The new single span bridge is approximately 55 feet long by 118 feet wide and allows for six traffic lanes, a 16 ft. wide median and two 7 ft. wide sidewalks – one on each side of the bridge. Due to the existing roadway and extensive utility work that must be performed, the bridge was designed to be built in 2 stages.
The bridge superstructure consists of precast/prestressed concrete voided slabs with a cast-in-place concrete deck slab. The superstructure is supported by seat-type abutments, abutment footings, and 14” square precast/prestressed concrete driven piles. Cantilevered wingwalls and a retaining wall support the roadway edges adjacent to the creek. Approach slabs at each end of the bridge provide for a smooth transition over the bridge.