American Legion Memorial Bridge[Map] Deck plate girder bridge over Potomac River on Interstate 495 (Captial Beltway) Open to traffic Built 1963; rehabilitated 1986
Baltimore Road Bridge[Map] Concrete arch bridge over Rock Creek on Baltimore Road in Rockville Open to traffic Built 1911
Black Rock Road Bridge[Map] Steel stringer bridge over Seneca Creek on road Open to traffic Built 1906
BO - Massachusetts Avenue Bridge[Map] Lost Closed-spandrel arch bridge over Massachusetts Avenue on B&O RR Georgetown Branch Replaced by a new bridge Built 1930
Cabin John Aqueduct Bridge[Map · Street View] Stone arch bridge over Cabin John Creek on Macarthur Blvd. Open to traffic Built 1853-63 to carry Washington Aqueduct; rehabilitated 2001
Carderock C&O Canal Tunnel[Map] Tunnel under Chesapeake & Ohio Canal on Carderock Access Road Open to traffic Built 1962; rehabilitated 1991
Cedar Lane Bridge[Map · Street View] Beam bridge over Rock Creek on Cedar Lane Open to traffic Built 1959; rehabilitated 2011
CSX - Beach Drive Overpass[Map · Street View] Stone arch bridge over Beach Drive andRock Creek on CSX RR Open to traffic Believed to have been built either 1873 or 1905
Georgetown Branch Trail - Rock Creek Trestle[Map · Street View] Lost Timber stringer bridge over Rock Creek on former Baltimore & Ohio RR Superstructure replaced Original 1892 trestle was 1,400' by 67' all-timber span rebuilt w/ steel center deck and mostly replaced by fill to 281' length 1904; damaged 1967 fire and 1972 flooding; rail service abandoned 3-1985; demolished 2019
Montevideo Road Bridge[Map] Pony truss bridge over Dry Seneca Creek on Montevideo Road in Poolesville Open to traffic Built 1910; rehabilitated 1989
North Branch Rock Creek Bridge[Map] Concrete arch bridge over North Branch of Rock Creek on MD 115 Open to traffic Built 1917; rehabilitated 1970
Northwest Branch Bridge[Map] Concrete arch bridge over Northwest Branch on US 29 in White Oak Open to traffic Built 1920; rehabilitated 1961
Old Columbia Pike Bridge[Map] Closed-spandrel arch bridge over Paint Branch on Old Columbia Pike Intact but closed to all traffic Built 1912; widened 1930; made obsolete by bridge on new alignment in 1957
Paint Branch US 29 Bridge[Map] Deck girder bridge over Paint Branch on US 29 Open to traffic Built 1957; rehabilitated 1990
Patuxent River Bridge near Scaggsville MD[Map] Pratt through truss bridge over Patuxent River on Columbia Turnpike Demolished Built in 1883 by Pittsburgh Bridge Company. Replaced by Rt 29 Bridge 1952
Saul Road Bridge[Map · Street View] Steel arch bridge over Silver Creek on Saul Road Open to traffic Built 1940 Recon 1996
Selden Island Bridge[Map · Street View] Bailey pony truss bridge over Potomac River on private road Intact but closed to all but private traffic
Seneca Aqueduct[Map · Street View] Brick arch bridge over Seneca Creek on C&O Canal Path Open to pedestrians Built 1833, One span collasped after flooding in 1971
Sligo Creek Bridge[Map] Concrete arch bridge over Sligo Creek on MD 195 Open to traffic Built 1932
Talbot Avenue Overpass[Map · Street View] Pony/through plate girder bridge over CSX Transportation (former Baltimore & Ohio) on Talbot Avenue Bridge removed for future preservation and construction of replacement July 2019 Built 1918; redecked 1986; rehabilitated 1995, closed April 2017; removed for preservation July 2019
Unused Clara Barton Parkway Overpass[Map · Street View] Concrete rigid frame bridge over Clara Barton Parkway (Northbound) for a ramp that was never built Closed to all traffic Built 1961, but never used
White's Ferry[Map · Street View] Ferry over Potomac River Closed due to ongoing court cases regarding property rights on Virginia side
White's Ferry Bridge[Map · Street View] Abandoned iron truss bridge over C&O Canal Abandoned Built May-June 1876 to replace earlier bridge dating to 1866