Lower Granite Dam Fish Moorage Construction Surveys

Lower Granite Dam, WA for Total Site Services and Garco JV, Walla Walla Corps of Engineers

In this project, White Shield Inc. offered Construction Survey Support to Total Site Services/Garco JV for the USACE Walla Walla. Specifically supplying support for the establishment of location and monitoring of pier driving for the Lower Granite Dam Fish Barge Moorage. Overall the project involved construction of a new moorage facility and mooring dolphin at Lower Granite Dam. The new moorage facility is a reinforced concrete wharf approximately 300 feet in length and 40 feet in width. The wharf was fabricated using a combination of cast-in-place and precast concrete. The wharf structure consisted of precast cap beams and precast slabs set on top of 4.5-foot diameter reinforced concrete drilled shafts, approximately 40-feet in length. A cast-in-place topping slab and in-fill tied the drilled shafts, cap beams, and precast slabs together. A floating plant and drill rig were required for installation of the drilled shafts. The mooring dolphin consisted of a 15-foot diameter concrete shaft, approximately 40 feet in length, drilled and anchored approximately 20 feet 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.