2017 Map of Silcott Island

About this map

The Snake River carves through the basalt-walled canyons of the Palouse region, defining the borders between Garfield, Whitman, and Asotin counties. This modern survey illustrates the altered landscape of Lower Granite Lake and Silcott Island, features shaped by the river's historical transformation for navigation and hydroelectric power. The small settlements of Silcott and Moses sit along the riverbanks, connected by the Indian Timothy Bridge near the mouth of Alpowa Cr. The surrounding terrain is marked by dramatic elevation changes, from the depths of Steptoe Canyon and Sheep Gulch to the high-elevation Flerchinger Ridge. Genealogists and local historians can trace the road networks that wind through these landforms, including Silcott Grade Rd and Steptoe Canyon Rd, which follow the natural drainage patterns of the coulee-scarred plateau.