C.R.S. § 37-84-103

(1) Any bridge constructed on a public highway, a public traveled road, a street, or an alley to accommodate the crossing of any ditch, canal, or other waterway shall be constructed in accordance with applicable standards established by the state, county, or municipality having jurisdiction over such public highway, public traveled road, street, or alley. (2) Any person, partnership, association, or corporation desiring to have such a bridge constructed shall bear the cost of construction and enter into an agreement with the unit of government having such jurisdiction. Payment for such construction shall be made before construction begins.