en.Wedoany.com Reported - Tetra Tech has been selected as the lead design engineer to provide planning, assessment, engineering, and construction services for the spillway modernization of two hydropower plants owned by Chelan County Public Utility District (PUD) in Washington State. The project will be delivered using a progressive design-build (PDB) approach.
Under a multi-year sole-source contract, Tetra Tech will organize engineers, scientists, and technical experts to collaborate with Chelan County PUD and the PDB team to develop new and resilient spillway infrastructure for Rock Island Dam and Rocky Reach Dam. Both dams are located on the Columbia River, the fourth-largest river in the United States by flow volume. This partnership aims to enhance the operational reliability and safety of both hydropower facilities.
Tetra Tech's scope of work includes: condition assessment of critical infrastructure; structural, mechanical, and electrical analysis for new spillway gates, gate hoists, and control systems; spillway concrete rehabilitation; advanced seismic analysis; structured risk and potential failure mode (PFM) analysis; targeted value engineering studies; and development of new design solutions for both dam facilities.
"Chelan County PUD owns and operates the second-largest non-federal publicly owned hydroelectric generation 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 high-end hydropower expertise to improve 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, it has an installed capacity of 629 megawatts and an annual generation of 2,025 gigawatt-hours. Its capacity was increased in 2953 (sic, likely 1953), and a second powerhouse was constructed in 1979. The dam has two powerhouses with 19 generators and 31 spillway gates.
Rocky Reach Dam began construction in 1956 and entered commercial operation in 1961, initially with seven generators. Located on the Columbia River approximately 7 miles upstream of Wenatchee, it now has 11 generators with a nameplate capacity of 1,349 megawatts and an annual generation of 4,901 gigawatt-hours, along with 12 spillway gates.
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