1968 Map of Steamboat Rock SW

About this map

Banks Lake dominates the center of this landscape, its waters filling the Upper Grand Coulee at a normal pool elevation of 1,570 feet. The rugged basalt geography is most famously represented by Steamboat Rock in the northeast, a massive prehistoric island of stone left behind by glacial floods. Small settlements and local landmarks like Ferguson and Blain are marked along the western plateau, while the eastern shore features drainage networks such as Rusho Creek and Ladds Creek. This 1960s survey, with underwater contours provided by the U. S. Bureau of Reclamation, documents the transformed coulee after the construction of the Grand Coulee Dam, showing the modern reservoir alongside older features like the Devils Punch Bowl and the Poplars Picnic Area.