Double-barreled
Blenheim Bridge (Schoharie County, New York)Built 1855; bypassed 1936
Covered bridge over Schoharie Creek on River Road
Open to pedestrians
St. Mary River Aqueduct Bridge (Glacier County, Montana)Built 1915 by the Minneapolis Bridge Co.
Two-span through truss bridge over St. Mary River on CR 224, also carrying a pair of water pipelines
Open to traffic