Wyo. Stat. § 18-12-123
The board, by resolution, shall determine whether coupon bonds or registered bonds of the district shall be issued and sold to raise money for any of the purposes for which the district was formed, if the bonds are authorized, and shall similarly fix and determine the denomination of each bond, which shall be not less than one thousand dollars ($1,000.00), and the rate of interest which shall be paid thereon, payable annually or semiannually as the board shall by resolution determine, and the resolution shall also fix the number of years that the whole or a part of the bonds shall run and the maturity thereof, neither of which shall exceed twenty-five (25) years from the date of the bond or the date of any series of the bonds.
W.S. 18-12-123