Wyo. Stat. § 15-6-501
Any first class city or any town having a population of four thousand (4,000) or more may provide by ordinance for letting to the lowest responsible bidder for any period not exceeding one (1) year, as prescribed by the ordinance, a contract for the construction, in accordance with specifications prepared by the city engineer and approved by the governing body, of all cement or concrete sidewalks which the governing body may order constructed during the term of the contract. The proposed ordinance shall be published at least two (2) times in a newspaper of general circulation within the city or town, and written notice thereof shall be served in the manner provided by Wyoming Rules of Civil Procedure upon the owner or owners of property abutting the sidewalks which have then been ordered and which are then proposed to be ordered to be constructed. The first publication of the ordinance shall be made and written notices served not less than thirty (30) days before the date for hearing objections. Any owner of any lot or parcel of land or property to be assessed for the cost of construction of the sidewalks then ordered or proposed to be ordered to be constructed may appear in person or by counsel at the hearing and show cause, if any, why the sidewalks should not be constructed. If objections are made to the construction of the sidewalks by the owners or agents representing more than one-half (1/2) of the total number of lineal feet frontage of all property which would be assessed to defray the cost of the sidewalks, the sidewalks shall not be constructed. The contractor shall give bond for the performance of his contract as required by the ordinance. The ordinance shall provide that upon ordering the construction of any such sidewalk the city engineer or the street commissioner shall immediately give written notice thereof, served personally on the owner or owners, or agents of the abutting property, or by publication once a week for a period of four (4) weeks in a newspaper of general circulation within the city or town, fully describing the termini, course, width and character of the walk ordered. The notice shall provide for a period of thirty (30) days during which parties so desiring may construct the walk abutting their property, and that all the walks so ordered remaining unbuilt at the expiration of the thirty (30) days from the date of service, or of the first publication, shall be constructed by the contractor. The ordinance shall also provide that at the expiration of the thirty (30) days the city engineer or the street commissioner shall notify the contractor to build the portions of the sidewalk ordered that have not been built. The contractor shall construct the sidewalk in accordance with the ordinance and his contract within sixty (60) days after he is so notified.
W.S. 15-6-501