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,
Foster Coulee Foster Coulee Foster Coulee is a coulee in Douglas County, Washington. Like the larger Moses Coulee nearby, it was formed during the Missoula Floods at the end of the last ice age, some 14,000 years ago. Washington State Route 17 between Bridgeport, Washington and Coulee City, Washington follows East Foster Creek along much of the coulee's valley floor. East Foster Creek now flows east to west through Foster Coulee to Grand Coulee. The United States Geological Survey quadrangle map "Foster Coulee" is named for this prominent feature. Foster Coulee was formed during the Missoula Floods. The Okanogan lobe of the