This investigation, completed for the Pacific Northwest National Laboratory (PNNL), is part of the Grays River Watershed and Biological Assessment commissioned by Bonneville Power Administration under project number 2003-013-00 to assess impacts on salmon habitat in the upper Grays River watershed and present recommendations for habitat improvement. This report presents the findings of the geomorphic assessment and is intended to support the overall PNNL project by evaluating the following: ?? The effects of historical and current land use practices on erosion and sedimentation within the channel network ?? The ways in which these effects have influenced the sediment budget of the upper watershed ?? The resulting responses in the main stem Grays River upstream of State Highway 4 ?? The past and future implications for salmon habitat.