Rocky Reach Juvenile Fish Bypass (tbi0205) Wenatchee, WA Removal of an underwater prototype structural steel fish surface collector and bypass system.
Installation of new structural steel underwater surface collector, intake screens, bypass conduit and Juvenile Sampling Facility with new concrete pump station at Rocky Reach Dam on the Columbia River in up to 110 ft. of water with level changes during the day and variable river currents working in the forebay of the dam. All the work accomplished using large crawler and ringer cranes on barges with material access by barge. The work includes 30 each 36 in. diameter drilled shaft piles in the river bottom of 10,000 psi to 20,000 psi rock in water depths up to 110 ft. deep. The piles are 24” diameter steel and they are set in the drilled shafts and grouted underwater. All work was done inside a working 48” diameter steel casing to protect river waters from drill spoils. The concrete pump station was a 200 ft. long x 60 ft. wide x 40 ft. high concrete structure with structural steel framing inside. We cast the lower half of the structure on pontoon barges. The barges were sunk from underneath the concrete structure and the concrete structure floated out. The concrete structure was ballasted down to be installed directly over 24 each piles all with tops underwater so that the concrete pump station structure rests on the 24 piles underwater.
Contract:BID 01-50 Start Date:April 2002 Completion Date: Complete Owner: Public Utility District No. 1 of Chelan County
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