The North Fork Big Thompson 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 Rowe Glacier on the north slope of Hagues Peak, in the Mummy Range of Rocky Mountain National Park. It flows through Lake Dunraven, over Lost Falls and through Glen Haven before a confluence with the Big Thompson in Drake.

See also List of rivers of Colorado

References