Construction of the power plant was authorized by the Flood Control Act of December 22, 1944. Construction began in 1947 and was completed in 1952.
The Congress authorized the Boysen Unit of the Pick Sloan Missouri Basin Program under the Flood Control Act of December 22, 1944, Public Law 534, which approved the general comprehensive plan set forth in Senate Document 191, as revised and coordinated by Senate Document 247, 78th Congress, 2d Session.
The Boysen Unit provides regulation of the streamflow for power generation, irrigation, flood control, sediment retention, fish propagation, and recreation development.
Power generated at the Boysen Power Plant is fed into the Western Division, Pick-Sloan Missouri Basin Program transmission facilities for use within that division. An overflow, weir-type spillway controlled by radial gates is located on the right abutment and discharges immediately upstream and left of the Boysen Power Plant. The power plant has an installed capacity of 15,000 kilowatts developed by two 7,500-kilowatt units operating under an average head of 99 feet. Each unit is served by a 10-foot-diameter steel penstock joined to a common 15-foot diameter steel penstock immediately upstream from the power plant. The 15-foot-diameter penstock leading from the intake structure to the units was located to utilize the bore of an existing railroad tunnel made available through relocation of the CB&Q Railroad Construction of the power plant was authorized by the Flood Control Act of December 22, 1944. Construction began in 1947 and was completed in 1952. Design of the replacement CO2 fire suppression system for the two generating units was completed in FY 2002. The contract was awarded in early FY 2003 and will be completed in FY 2005. A contract was awarded in FY 2003 for replacement of the bonnet drain valves and piping on both unit ring seal gates. Work was completed in March 2004. A replacement wicket gate greasing system was designed in FY 2004 and the new system will be installed in FY 2005.
Western Electricity Coordinating Council, Rocky Mountain Power Area
PMA Service Area
Western Area Power Administration, Rocky Mountain Region
Original Nameplate Capacity
Year of Initial Operation
Title: Facility Manager Organization: Big Horn Basin Field Office Address: #4 Reclamation Road City: Cody, WY 82414 Phone: 307-527-6256-(ext.-260)
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