Wyo. Stat. Ann. § 15-6-401

If the notice provided for in W.S. 15-6-202, is in whole or in part to establish or alter a grade, the governing body, after the expiration of giving the notice as provided in W.S. 15-6-202, may establish it by ordinance or resolution. The cost of establishing or altering the grade of any streets, highway, avenue, road or alley may be paid out of the general funds of the city or town or may be specially assessed.