Wyo. Stat. § 41-3-206
The owner of any foreign water conveyed or allowed to flow into the state of Wyoming from without the boundaries of this state shall file in the office of the secretary of the Wyoming state board of control, within the period of one (1) month before the first conveyance or flowage of such foreign water into the state of Wyoming, a certificate in writing, signed by the owner of such foreign water, specifying the former owner or owners of such foreign water, the amount thereof so acquired, the natural stream channel to be used in the state of Wyoming as a conduit for the delivery of such foreign water to the point of diversion in the state of Wyoming and also designating the point of diversion of such foreign water in the state of Wyoming.
W.S. 41-3-206