Wyo. Stat. Ann. § 15-6-504

Any city or town authorized by this article may proceed in the matter of sidewalk construction either under this article or under the provisions of law already in force in regard to sidewalk construction, or partly under the provisions of this article and partly under the older provisions of law. It is the intention of this article to supplement but not to supersede or otherwise affect other provisions of law with regard to powers of first class cities in relation to sidewalks.