Thanks to two-buck-plus gas prices, that driving vacation to the Grand Canyon may not be looking so good now. But Washington's Grant County holds many grand canyons and it's only a tank of gas away. The county, named after President Ulysses S. Grant, traces its natural features back to an Ice Age flood. Some 15,000 years ago, glacial Lake Missoula covered most of western Montana until breaking its 2,000-foot-tall ice dam. The monstrous rushing waters carved out Eastern Washington's scablands and created Grand Coulee, Dry Falls and Drumheller Channels. Grand Coulee stretches out 50 miles from Grand Coulee Dam to Soap Lake, extends 2 to 5 miles wide and drops down 1,000 feet.