The Spokane Valley is a valley of the Spokane River through the southern Selkirk Mountains in the U.S. state of Washington. The valley is home to the cities of Spokane and its suburbs Spokane Valley, Liberty Lake, and Millwood. The valley is bounded on the north and south by the Selkirk Mountains, on the west by the Columbia River Basalt Group, and on the east by the Rathdrum Prairie at the Idaho …