Wyo. Stat. § 24-1-123: Highways subject to injury from cattle; drover's liability.

Any person who shall drive any herd of horses, cattle or flock of sheep over any portion of any road or highway, so designated as not for horses, cattle or sheep as aforesaid, after such designation and the posting of notices as aforesaid, and after the provision of another reasonable highway for cattle, horses and sheep in lieu thereof as aforesaid, shall be liable to the county in which is situated such mountain road or highway, for any and all damages done thereto, by driving over the same, such flocks or herds of cattle, horses or sheep.