National Historic Landmark
Blenheim Bridge (Schoharie County, New York)Built 1855; bypassed 1936
Covered bridge over Schoharie Creek on River Road
Open to pedestrians
Bollman Bridge (Howard County, Maryland)Built for the main line of the B&O Railroad in 1869. Moved to present location around 1887. Remained in service until 1947. Restored in 1968 (perhaps 1983).
Through truss bridge over Little Patuxent River in Savage
Open to pedestrians
Brooklyn Bridge (Kings County, New York)Opened to traffic May 24, 1883
Suspension bridge over East River between Manhattan and Brooklyn in New York
Open to traffic
Cabin John Aqueduct Bridge (Montgomery County, Maryland)Built 1853-63; rehabilitated 2001
Stone arch bridge over Cabin John Creek on Macarthur Blvd.
Open to traffic
Carrollton Viaduct (Baltimore, Maryland)Built 1829
Stone arch bridge over Gwynn's Falls on the CSX Railroad
Open to traffic
Delaware Aqueduct (Pike County, Pennsylvania)Built 1848 by John A. Roebling to carry the Delaware & Hudson Canal; later converted for highway traffic; rehabilitated 1985
Suspension bridge over Delaware River on the former Delaware & Hudson Canal
Open to traffic
Roebling Suspension Bridge (Hamilton County, Ohio)Built 1866 by John A. Roebling. Rehabilitated 1955.
Suspension bridge over the Ohio River between Cincinnati and Covington
Open to two-lane traffic
Smithfield Street Bridge (Allegheny County, Pennsylvania)Built 1883 under the direction of engineer Gustav Lindenthal
Two-span lenticular through truss bridge over Monongahela River on Smithfield Street in Pittsburgh
Open to four lanes of traffic
Wheeling Suspension Bridge (Ohio County, West Virginia)Built 1849; rehabilitated 1999
Suspension bridge over Ohio River on WV 251 in Wheeling
Open to traffic