They are native in Colorado only in the South Platte River drainage, but recent research has also placed them in the Yampa River (Colorado) and the Green River (Utah).
For example, a 2006 report on 83 habitat areas in the Yampa River, which sampled 14,140 fish, reported only 1.6% of that total (221 fish) were native.
The Yampa River is a 250 mi (402 km) long river in northwestern Colorado, of the Southwestern United States.
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