1. Watershed characterization for precipitation-runoff modeling system, north fork, American River and east fork, Carson River watersheds, California Yale Public content 1995. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. American River Watershed (Calif.) and Carson River Watershed (Nev.).