Foster Coulee cut off and the Columbia River then discharged through Moses Coulee. Foster Coulee has been studied as a potential pumped-storage hydroelectricity site. The coulee would be dammed and approximately 500 MW generation capacity installed, exploiting the c. difference in elevation between the new reservoir and the existing Banks Lake. Banks Lake is in turn created by pumping water uphill from the Columbia River at the Grand Coulee Dam. The Washington ground squirrel, a candidate for U.S. Endangered Species Act listing, inhabits Foster Coulee. Foster Coulee Foster Coulee is a coulee in Douglas County, Washington. Like the larger Moses Coulee nearby,
Grand Coulee Dam Grand Coulee Dam (not including the Third Powerplant) to be $168 million; its actual cost was $163 million in 1943 ($ in dollars). Expenses to finish the power stations and repair design flaws with the dam throughout the 1940s and '50s added another $107 million, bringing the total cost to $270 million ($ in dollars), about 33% over estimates. The Third Powerplant was estimated to cost in 1967, but higher construction costs and labor disputes drove the project's final cost in 1973 to ($ in dollars), about 55% over estimates. Despite estimates being exceeded, the dam became an economic success,