Bumping Lake is a lake and reservoir along the course of the Bumping River, in Yakima County, Washington state, USA. Bumping Lake has also named as "Lake Plehnam" by Preston's Map of Oregon and Washington in the 1850s, and "Tannum Lake" by the United States General Land Office Map of Washington of 1897. The lake is used as a storage reservoir for the Yakima Project, an irrigation project run by the United States Bureau of Reclamation. Although a natural lake, Bumping Lake's capacity and discharge is controlled by Bumping Lake Dam, a 60-foot (18 m) high earthfill structure built in 1910 and modified in the 1990s. As a storage reservoir, Bumping Lake's active capacity is . References External links Bumping Lake - Recreation.gov Friends of Bumping Lake Bumping Lake Dam, United States Bureau of Reclamation Reservoirs in Washington (state) Lakes of Yakima County, Washington Buildings and structures in Yakima County, Washington Okanogan National Forest Dams in Washington (state) United States Bureau of Reclamation dams Dams completed in 1910