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Steamboat Rock State Park is a 3,522-acre Washington state park located near the north end of Banks Lake in the Grand Coulee. The park takes its name from the landscape's dominating feature, Steamboat Rock, a basalt butte that rises 800 feet above the lake which nearly completely surrounds it. The butte's plateau covers more than 600 acres and was used by nomadic Native American tribes and by early settlers. During the last Ice Age, the monolith stood as an island in the new bed of the Columbia River where it had been diverted by ice dams. Once the dams burst creating massive floods, the Columbia returned to its original course, leaving Steamboat Rock as a prominent feature of the dry Grand Coulee.

Steamboat Rock State Park
Washington State Park
SteamboatRock.jpg
Country United States
State Washington
County Grant
Elevation 1,975 ft (602 m)
Prominence 2,283 ft (696 m)
Coordinates 47°51′47″N 119°08′00″W / 47.86306°N 119.13333°W / 47.86306; -119.13333Coordinates: 47°51′47″N 119°08′00″W / 47.86306°N 119.13333°W / 47.86306; -119.13333 
Area 3,522 acres (1,425 ha)
Established 1972
Management Washington State Parks and Recreation Commission
Location in the state of Washington
Website: Steamboat Rock State Park

Steamboat Rock State Park is a 3,522-acre (1,425 ha) Washington state park located near the north end of Banks Lake in the Grand Coulee. The park takes its name from the landscape's dominating feature, Steamboat Rock, a basalt butte that rises 800 feet (240 m) above the lake which nearly completely surrounds it. The butte's plateau covers more than 600 acres (240 ha) and was used by nomadic Native American tribes and by early settlers. During the last Ice Age, the monolith stood as an island in the new bed of the Columbia River where it had been diverted by ice dams. Once the dams burst creating massive floods, the Columbia returned to its original course, leaving Steamboat Rock as a prominent feature of the dry Grand Coulee.