Little Goose Lock and Dam is a run-of-the-river hydroelectric dam in Columbia and Whitman counties in the state of Washington, on the Snake River. The dam is located 9 miles (14 km) northeast of the town of Starbuck, and 25 miles (40 km) north of Dayton.

Construction began in June 1963. The main structure and three generators were completed in 1970, with an additional three generators finished in 1978. Generating capacity is 810 megawatts, with an overload capacity of 932 MW. The spillway has eight gates and is 512 feet (156 m) long.

Little Goose Lock and Dam is part of the Columbia River Basin system of dams.

Lake Bryan, named for Doctor Enoch A. Bryan, is formed behind the dam. The lake stretches to the base of Lower Granite Dam, 37 miles (60 km) upstream. Lake Herbert G. West, formed from Lower Monumental Dam runs 28 miles (45 km) downstream from the base of the dam.

Navigation lock
  • Single-lift
  • 86 feet (26 m) wide
  • 668 feet (204 m) long
Little Goose Dam
Locale Columbia / Whitman counties, Washington, USA
Construction began June 1963
Opening date 1970
Dam and spillways
Type of dam Concrete-gravity, run-of-the-river
Height 98 feet (30 m)
Length 2,655 feet (809 m)
Type of spillway Service, gate-controlled
Creates Lake Bryan
Capacity 832,964,000 cubic yards (636,847,000 m3)
Surface area 10,025 acres (40.57 km2)
Power station
Type Yes
Turbines 6 x 135-153 MW units
Installed capacity 810 megawatts
Maximum capacity 932 megawatts