2023 Map of Rock Island Dam

About this map

The Rock Island Dam anchors this stretch of the Columbia River, where the waters of the Rock Island Pool give way to Wanapum Lake. The terrain is defined by dramatic elevation changes, from the heights of Badger Mtn and Jumpoff Ridge down to the carved depths of Moses Coulee and Francis Canyon. The small settlements of Rock Island and Voltage sit along the river's edge, connected by a network of steep grades and local roads such as Battermann Rd and Rock Island Grade SW. In the southwest, the Colockum Game Range spans a landscape of named drainages including Whitson Canyon and Lone Pine Canyon. This 2023 survey illustrates the complex boundary where Douglas, Chelan, Kittitas, and Grant counties meet, highlighting a region where infrastructure and geography are closely intertwined.