en.Wedoany.com Reported - Tetra Tech has been selected as the lead design engineer for the Progressive Design-Build (PDB) hydropower dam spillway modernization project for Chelan County Public Utility District (Chelan County PUD) in Washington State, and will provide planning, assessment, engineering, and construction services for Rock Island Dam and Rocky Reach Dam.
Under this single-award, multi-year contract, Tetra Tech’s engineers, scientists, and technical experts will collaborate with Chelan County PUD and the PDB team to develop new resilient spillway hydropower station infrastructure for the two Columbia River facilities, enhancing their operational reliability and safety. The Columbia River is the fourth-largest river in the United States by flow volume.
Tetra Tech will conduct critical infrastructure condition assessments, perform structural, mechanical, and electrical analyses to develop new spillway gates, gate hoists, and control systems, repair spillway concrete, conduct advanced seismic analyses, develop structured risk and potential failure mode (PFM) analyses, carry out targeted value engineering studies, and create new design solutions for both dam facilities.
“Chelan County PUD owns and operates the second-largest non-federal publicly owned hydroelectric system in the United States,” said Roger Argus, Chief Executive Officer of Tetra Tech. “Tetra Tech is pleased to apply our Leading with Science® approach and hydropower expertise to enhance the safety and operational reliability of this critical infrastructure and support Chelan County PUD in providing safe, resilient power to its customers.”
Rock Island Dam, completed in 1933, was the first dam built across the Columbia River, located approximately 12 miles downstream of Wenatchee, with an installed capacity of 629 MW and an annual generation of 2,025 GWh. The dam’s capacity was increased in 2953, and a second powerhouse was constructed in 1979, currently housing a total of 19 generators and 31 spillway gates across both powerhouses.
Rocky Reach Dam began construction in 1956 and entered commercial operation in 1961, initially equipped with 7 generators. Located on the Columbia River approximately 7 miles upstream of Wenatchee, the dam now has 11 generators with a nameplate capacity of 1,349 MW and an annual generation of 4,901 GWh, along with 12 spillway gates.
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