Bonneville Dam - Bonneville, Wash.
The project consisted of driving six 10 ft diameter piles down into bedrock. Pile lengths were 136 ft to 200 ft. The piles were drilled out and socketed into bedrock up to 30 ft. Rebar cages were installed full depth and the pile was filled with concrete. Pier caps were constructed on top of the pile. Twelve 7 ft. square precast box girder sections, ranging in length from 84 ft to 180 ft, were fabricated and set in pairs on top of the caps.