This report on erosion, sedimentation, and flooding on the Trout Creek and Upper Truckee River Watershed is based on field work carried out by the Division of Soil Conservation. It is a part of a larger study, the Lake Tahoe Coordinated Study, initiated by the Department of Conservation in 1967 which involved the Division of Soil Conservation, the Division of Mines and Geology, and the Division of Forestry. The coordinated study is intended to help agencies of local government and others to cope with resource problems that have developed within the Lake Tahoe Basin