Summit Post details this trail nicely and includes photographs.
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Adapted from Summitpost.org:
Steamboat Rock is an island (or near island with an isthmus) of basalt in Grand Coulee’s Banks Lake. The mesa of rock stands a full 700 feet above the surrounding lake (1,571 ft) but is only even in altitude with the distant walls of the coulee. The flattish summit area is quite large, larger than it appears from below, and is comprised of two tables separated by a minor “valley.”
Nearest Town: Quincy
Traveling SR-155, the entrance to Steamboat Rock State Park is located 11 miles from Electric City and 16 miles from Coulee City. The park entrance is south of the formation and uses the connecting isthmus for access.
Leave It Better than You Found It. This should be every user’s goal. Pick up trash left by others, pull noxious weeds along your route, throw branches over unwanted spur trails, etc.
Disclaimer. Treat this information as recommendations, not gospel. Conditions change and those contributing these reports are volunteers–they may make mistakes or not know all the issues affecting a route. You are responsible for yourself, your actions, and your safety. If you won’t accept that responsibility, you are prohibited from using our information.