| Steamboat Rock State Park | |
| Map: | USA Washington#USA |
| Map Size: | 280 |
| Relief: | 1 |
| Location: | Grant, Washington, United States |
| Coordinates: | 47.8631°N -119.1333°W |
| Area Acre: | 3522 |
| Elevation: | 1975feet |
| Established: | 1972 |
| Operator: | Washington State Parks and Recreation Commission |
| Website: | Steamboat Rock State Park |
Steamboat Rock State Park is a 3522acres 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 above the lake which nearly completely surrounds it. The butte's plateau covers more than 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 and the Scablands, the Columbia returned to its original course, leaving Steamboat Rock as a prominent feature of the dry Grand Coulee.
The park has of shoreline and is open year-round for camping and day use. The park has trails for hiking, biking, and equestrian use as well as water activities including boating, swimming, waterskiing, and fishing. Winter activities include cross-country skiing, ice fishing, and ice climbing.