Wyo. Stat. § 41-10-131
The principal of and interest on revenue bonds herein authorized to be issued, and any prior redemption premium or premiums, shall be payable solely from the net revenues derived from the operation of the project for the acquisition or improvement of which the bonds are issued, including, without limiting the generality of the foregoing, revenues of a prior existing project which is improved by the expenditure of the bond proceeds, and revenues of improvements theretofore or thereafter acquired to such project which are not acquired by the expenditure of such bond proceeds; and the principal of and interest on special assessment bonds herein authorized to be issued, and any prior redemption premium or premiums, shall be payable solely out of moneys collected on account of the assessments, principal, interest and any penalties, levied for the project for the acquisition or improvement of which the bonds are issued; provided, however, that the payment of such special assessment bonds may at the board's option be additionally secured as herein provided. The board may ascertain and determine in a resolution authorizing the issuance of the bonds that the district has, or will have during the term of the bonds, or has and so will have, designated surplus and unpledged revenues derived from the operation of any income-producing project, or special assessments or excise tax or taxes which the district is herein authorized to levy, fix or charge, or from any combination thereof, and the board in said resolution may pledge all or a portion of such surplus and unpledged revenues as additional security for such payment of said bonds, and at its option may deposit such revenues in a fund created to pay the bonds or created to secure additionally their payment. Any such revenue pledged directly or as additional security for the payment of bonds of any one issue or series which revenues are not exclusively pledged therefor, may subsequently be pledged directly or as additional security for the payment of the bonds of one or more issues or series subsequently authorized. All bonds of the same issue or series shall, subject to the prior and superior rights of outstanding bonds, claims and other obligations, have a prior, paramount and superior lien on the revenues pledged for the payment of the bonds over and ahead of any other claims or obligations thereagainst subsequently incurred; provided, however, the resolution authorizing the issuance of any bonds may provide for the subsequent authorization of bonds or other obligations the lien for the payment of which on such revenues is on a parity with the lien thereon of the bonds therein authorized upon such conditions and subject to such limitations as said resolution may provide. All bonds not issued payable solely from such revenues or special assessments (with or without such additional security) shall be the general obligations of the district, and the full faith and credit of the district shall be pledged for the payment thereof. All bonds of the same issue or series shall be equally and ratably secured without priority by reason of number, date of maturity, date of bonds, of sale, of execution, or of delivery, by a lien on said revenues in accordance with the provisions of this act and the resolution authorizing said bonds, except to the extent such resolution shall otherwise specifically provide.
W.S. 41-10-131