Wyo. Stat. § 41-7-408
The commissioners may borrow money, not exceeding the amount of "assessment for construction," as herein provided, unpaid at the time of borrowing for such purposes, or for the payment of indebtedness they may have lawfully incurred, and may secure the same by notes or bonds bearing interest and not running beyond one (1) year after the last installment of the assessment, on the account of which the money is borrowed, shall fall due, which notes or bonds shall not be sold at less than ninety percent (90%) of their face value, which bonds shall be transferable by delivery to the same extent as negotiable paper of the highest character, and may deliver notes or bonds to the United States to be held and when deemed desirable or when the appraised value of the land in the district is double the bonded indebtedness, sold by it, and the net proceeds received from the notes or bonds applied to the liquidation of contract indebtedness of the district to the United States. Notes or bonds shall be in a form, terms and denominations as may be fixed by the secretary of the interior in carrying out the provisions of the act of congress of June 17, 1902 (32 Stat. 388) and all acts amendatory thereof or supplementary thereto, or that may be hereafter enacted as amendatory thereof or supplementary thereto, or other acts of congress heretofore or hereafter enacted providing for or permitting the acceptance of the bonds, and which notes or bonds shall not be held to make the commissioners personally liable, but constitute a lien upon the assessments for the repayment of the principal and interest of the notes or bonds. In case any monies derived from bonds sold to pay for the construction, as herein provided, now or hereafter, remains on hand after the work is completed and paid for, and not raised for damages unpaid for, the residue may be used in the maintenance and repair, as in this chapter provided, before making assessment for maintenance and repair.
W.S. 41-7-408