Bitterroot River Protective Association, Inc. v. Montana Department of Fish, Wildlife and Parks, 198 P.3d 219 (Mont. Sup. Ct. 2008)

(irrigation permits required for withdrawal of water for agricultural purposes from side channel of Bitterroot River, and public access allowed up to high-water mark; court utilized expansive definition of “natural” in reaching decision which  term was not limited to artificial or manufactured).