Geomorphic Mapping in Support of River Restoration on the Mainstem Trinity River, California

Historic land use, dam construction, water storage, and flow diversions in the Trinity River watershed have resulted in downstream geomorphic change, loss of salmonid habitat, and declines in salmonid populations. The Trinity River Restoration Program, tasked with implementing federally mandated restoration, requested a geomorphic change assessment to inform the planning process for future restoration work. This report documents an ARCMAP geodatabase (v.10.0) containing geomorphic features digitized from a series of rectified orthophotographs. Upland, riparian, and channel features were digitized from six available base images (1980, 1997, 2001, 2006, 2009, and 2011). This report describes the structure of the map geodatabase and the methods used to delineate individual geomorphic features.