The U.S. Army Corps of Engineers will accept bids May 18 for rehabilitation of 36 spillway gates at Oahe and Garrison Dams in the Dakotas.
Scope of Work
The Oahe project, in Pierre, SD, involves rehabilitating eight 50-by-23.5-foot spillway gates. The project includes abrasive-blast cleaning to SSPC-SP 5 (white metal) and recoating about 9,400 square feet of surfaces The painting is part of a general contract estimated at up to $7.5 million.
USGS (left) / USACE (right)
|Spillway gate cleaning and painting projects are up for bid at Garrison Dam (left) and Oahe Dam. In June 2011, the U.S. Army Corps of Engineers opened Oahe’s spillway gates to release a record 150,000 cubic feet per second of water to make room for heavy rains and snowmelt. Brig. Gen. John McMahon (right) views one of the release tunnels.|
The Garrison Dam project, in Riverdale, ND, involves rehabilitating 28 40-by-29-foot spillway gates. The project includes abrasive-blast cleaning to SSPC-SP 5 (white metal) and recoating about 31,360 square feet of gate surfaces. That painting is part of a general contract estimated at up to $10 million.
Both projects involve recoating with a zinc-rich primer and vinyl topcoat. The existing coatings on both projects contain lead. SSPC-QP 1 and QP 2 certifications are required for both, and both contracts require a NACE- or SSPC-certified inspector to perform coatings inspection services.
About the Sites
More than two miles long, Garrison Dam is the fifth-largest earthen dam in the world. It was built by the U.S. Army Corps of Engineers from 1947-53. The reservoir impounded by the dam is Lake Sakakawea, which extends to Williston and the confluence with the Yellowstone River, near the Montana border.
The Oahe Dam, along the Missouri River, creates Lake Oahe, the fourth-largest artificial reservoir in the United States, which stretches 231 miles to Bismarck, ND. The dam’s power plant provides electricity for much of the north-central United States.
It is named for the Oahe Indian Mission established among the Lakota Sioux in 1874. The project provides $150 million in annual flood control, electric power, irrigation, and navigation benefits, according to the Corps.
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