Costilla Crossing Bridge Two-span Thacher through truss bridge over the Rio Grande on CR G east of Antonito Open to one-lane traffic Built 1892 by the Wrought Iron Bridge Co.; rehabilitated 2006
Rito Seco Creek Bridge Two-span stone arch bridge over Rito Seco Creek on CO 142 in San Luis Open to traffic Built 1936
San Luis Bridge Open-spandrel arch bridge over Culebra Creek on CR 19 in San Luis Open to pedestrians only Built 1910-11 by the M.F. Levy Construction Co.