Bumping Lake

Bumping Lake is a lake and reservoir along the course of the Bumping River, in Yakima County, Washington state, USA. Bumping Lake was 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.^[1]

Bumping Lake
Bumping Lake
Location	Yakima County, Washington
Coordinates	46.8513°N 121.3193°W / 46.8513; -121.3193
Type	reservoir, natural
Primary inflows	Bumping River
Primary outflows	Bumping River
Catchment area	68 sq mi (180 km2)
Basin countries	United States
Max. length	3 mi (4.8 km)
Max. width	0.5 mi (0.80 km)
Water volume	0.01 cu mi (0.042 km3)
Surface elevation	3,426 ft (1,044 m)

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 33,700 acre⋅ft (41.6 million m³).^[2]