San Miguel County Colorado (Vacant / Not In Use) has 4 places on the National Register of Historic Places including 2 places of Statewide significance. Significant places include Lewis Mill and Smuggler-Union Hydroelectric Power Plant, Rio Grande Southern Railroad Trout Lake Water Tank, Valley View Leasing and Mining Company Mill.
Some of the country's most noteable architects helped create the San Miguel County places including Charles Maxwell, Rio Grande Southern Railroad, Otto Beselack and Walter L. Reed. Prominent architectural styles found in San Miguel Country are .