Colorado Revised Statutes Title 43. Transportation § 43-2-201. Public highways

(a) All roads over private lands dedicated to the public use by deed to that effect, filed with the county clerk and recorder of the county in which such roads are situate, when such dedication has been accepted by the board of county commissioners. A certificate of the county clerk and recorder with whom such deed is filed, showing the date of the dedication and the lands so dedicated, shall be filed with the county assessor of the county in which such roads are situate.

(b) All roads over private or other lands dedicated to public uses by due process of law and not heretofore vacated by an order of the board of county commissioners duly entered of record in the proceedings of said board;

(c) All roads over private lands that have been used adversely without interruption or objection on the part of the owners of such lands for twenty consecutive years;

(d) All toll roads or portions thereof which may be purchased by the board of county commissioners of any county from the incorporators or charter holders thereof and thrown open to the public;

(e) All roads over the public domain, whether agricultural or mineral.