Wyo. Stat. § 18-8-107
The board of trustees shall keep a careful record of all its proceedings and keep duplicate vouchers of all expenditures, one (1) set of vouchers to be kept in the office of the secretary of the board of trustees and the other to be filed annually with the board of county commissioners at its June session. The board of trustees shall annually report at the June meeting of the board of county commissioners all the important transactions for the previous twelve (12) months specifying in each report the money received from the county memorial hospital fund, all monies and properties received from other sources, the use and disposition of such monies and other property and such other facts as they deem of public interest or the board of county commissioners may require. The board of trustees shall make monthly reports when required by the board of county commissioners.
W.S. 18-8-107