Lower Granite Dam - Fish Barge Moorage

  • Lower Granite Dam - Fish Barge Moorage
  • Lower Granite Dam - Fish Barge Moorage
  • Lower Granite Dam - Fish Barge Moorage

Lower Granite Dam - Fish Barge Moorage

Lower Granite Dam, WA
Customer: US Army Corps of Engineers, Walla Walla District
Date Completed:

The new moorage facility consists of a reinforced concrete wharf approximately 300 ft in length and 40 ft in width. The wharf was fabricated using a combination  of cast-in-place and precast concrete.

The wharf structure consists of precast cap beams and precast slabs set on top of (32) 4’-6” diameter reinforced concrete drilled shafts, approximately 50 ft deep with 8 ft deep rock sockets. A cast-in-place topping slab and in-fill ties the drilled shafts, cap beams, and precast slabs together. One floating plant and drill rig was required for installation of the drilled shafts. The mooring dolphin consists of a 15 ft diameter concrete shaft, approximately 40 ft in length, drilled and anchored approximately 20 ft into bedrock. The mooring dolphin has a permanent steel casing, mooring cleats, fender system, and a cast-in-place top slab.


Other work included excavation, trenching for utilities, asphalt repair, installation of fender systems, mooring cleats, mooring bits, potable water lines, compressed air lines, electrical receptacles, area lighting, traffic bollards, and fabrication of a movable access stairway.