Wyo. Stat. § 41-11-205: Mileage, per diem and compensation for commissioners and assistant commissioners.

Each and every commissioner and assistant commissioner appointed to represent the state of Wyoming on an interstate compact or in the negotiation thereof shall be paid per diem and compensation in the same amount as provided for members of the Wyoming legislature and mileage at the rate set in W.S. 9-3-103 for each mile actually and necessarily traveled in the performance of his duties except state of Wyoming officers and employees shall only be reimbursed for mileage and per diem while away from their regular stations, as in other cases provided. The state engineer is charged with the responsibility for expenditure of such sums as are necessary under this act.