The Fall River is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map , accessed March 25, 2011 tributary of the Big Thompson River in Larimer County, Colorado. The river's source is near the Alpine Visitor Center in Rocky Mountain National Park. It flows down a canyon and over Chasm Falls before a confluence with the Big Thompson in Estes Park.
See also List of rivers of Colorado
References