STEVE RINGMAN / THE SEATTLE TIMES
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Trailing An Apocalypse
Steamboat Rock, which rises 525 feet in the flood chasm called the Grand Coulee, was once surrounded by the Ice Age Columbia River that ran here. The land is now Steamboat Rock State Park, where hikers can climb to the top and see the former flood and river course. The rock is bounded on three sides by Banks Lake, used to store irrigation water.