The Federal Energy Regulatory Commission recently issued original 50-year operating licenses for the 4.7-MW Clark Canyon Dam Hydroelectric Project and the 28.1-MW Red River Lock and Dam No. 5 Hydroelectric Project.
Clark Canyon Hydro LLC will build the Clark Canyon project at the Bureau of Reclamation’s Clark Canyon Dam on the Beaverhead River in Beaverhead County, Montana. Clark Canyon Dam was completed in 1964 and is about 2,950 feet long and 147.5 feet high. The reservoir has a volume of 253,442 acre-feet at the flood control pool elevation.
Reclamation withdraws water through a concrete intake structure and conduit in the reservoir that leads to an existing shaft house at the dam crest. From the shaft house, a 9-foot-diameter outlet conduit carries water about 360 feet through the dam before discharging into a stilling basin.
The new project will consist of a 360-foot-long, 8-foot-diameter steel penstock lining installed within the existing concrete conduit. At the river end of the liner, a new trifurcation will separate flows into two 35-foot-long, 8-foot-diameter steel penstocks leading to two 2.35-MW vertical Francis-type turbine-generator units located in a new powerhouse. The powerhouse will be 46 feet by 65 feet and constructed at the toe of the dam adjacent to the stilling basin.
Clark Canyon is expected to generate up to 15,400 MWh of electricity annually.
BOST5 Hydroelectric LLC will build the Red River Lock and Dam No. 5 project at the U.S. Army Corps of Engineers’ Lock and Dam No. 5 on the Red River in Bossier Parish, Louisiana. The navigation dam portion consists of a gated spillway section controlled by five 37-foot-high, 60-foot-long tainter gates, a 100-foot long leaf gate spillway section, and a 154-foot-long fixed crest overflow weir. The Lock and Dam impounds a 10,600-acre reservoir pool.
The new project will consist of a 416-foot-long excavated headrace channel to convey water from the reservoir into a 301-foot-long, 90-foot wide concrete powerhouse containing a horizontal Kaplan bulb turbine-generator unit, located on the east abutment of the dam. The project will operate in a run-of-release mode using flows made available by the Corps.
The project will generate when releases are between 2,860 cubic feet per second and 18,846 cfs. Red River is expected to generate 129,400 MWh of electricity annually.
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