Senator Wash Reservoir

Senator Wash Dam and Reservoir, an offstream pumping facility, is located about 18 miles northeast of Yuma, Arizona, on the California side of the Colorado River 2 miles upstream from Imperial Dam and at the river-end of Senator Wash. The purpose of this strategic off stream retention reservoir is to improve water scheduling of the Colorado River. This is accomplished by storing part of the riverflow upstream of Imperial Dam when it is not needed and releasing it to the river for downstream use when needed.