Prior to 1986, Wyoming water law required water to be diverted from its natural channel and conveyed to a point of use or stored constituting beneficial use. In 1986, enactment of the instream flow law expanded this concept to allow only the State of Wyoming to own a water right for instream flow in a natural channel for fisheries purposes.
Thus, pursuant to W.S. 41-3-1001 through 41-3-1014, a new water right can be issued, or an existing right changed, to allow water, when available, to remain in the natural stream channel and be protected for fisheries purposes according to its water right priority. With proper permitting, instream flow needs may be met from reservoir storage.
037-1 Wyo. Code R. § 1-22