Survey No. |
Name (as assigned by HAER) |
Status |
Type[2] |
Built |
Documented |
Carries |
Crosses |
Location |
County |
Coordinates |
MD-1 |
Baltimore and Ohio Railroad, Bollman Truss Bridge |
Extant |
Bollman truss |
1835 |
1984 |
Baltimore and Ohio Railroad (former) |
Little Patuxent River |
Savage |
Howard |
39°08′05″N 76°49′31″W |
MD-3 |
Baltimore and Ohio Railroad, Thomas Viaduct |
Extant |
Stone arch |
1835 |
1984 |
CSX Capital Subdivision |
Patapsco River |
Elkridge |
Howard |
39°13′18″N 76°42′48″W |
MD-5 |
Cumberland and Pennsylvania Railroad, Wills Creek Bridge |
Demolished |
Brick arch |
1860 |
1984 |
Cumberland and Pennsylvania Railroad (former) |
Wills Creek |
Cumberland |
Allegany |
39°40′14″N 78°47′25″W |
MD-9 |
Baltimore and Ohio Railroad, Carrollton Viaduct |
Extant |
Stone arch |
1829 |
1984 |
CSX Baltimore Terminal Subdivision |
Gwynns Falls |
Baltimore |
Independent city |
39°16′32″N 76°39′18″W |
MD-12 |
Baltimore and Ohio Railroad, Patterson Viaduct |
Ruin |
Stone arch |
1829 |
1970 |
Baltimore and Ohio Railroad (former) |
Patapsco River |
Ilchester |
Howard |
39°14′56″N 76°45′53″W |
MD-16 |
Baltimore and Ohio Railroad, Harpers Ferry Bridge Piers |
Ruin |
|
1836 |
1970 |
Baltimore and Ohio Railroad (former) |
Potomac River |
Maryland Heights, Maryland, and Harpers Ferry, West Virginia |
Washington County, Maryland, and Jefferson County, West Virginia |
39°19′25″N 77°43′38″W |
MD-22 |
Baltimore and Ohio Railroad, Waring Viaduct |
Extant |
Stone arch |
1906 |
1970 |
CSX Metropolitan Subdivision |
Great Seneca Creek |
Gaithersburg |
Montgomery |
39°09′32″N 77°14′53″W |
MD-23 |
Potomac Edison Company, Chesapeake and Ohio Canal Bridge |
Extant |
Vertical-lift bridge |
1923 |
1970 |
Potomac Edison Company siding |
Chesapeake and Ohio Canal |
Williamsport |
Washington |
39°35′59″N 77°49′36″W |
MD-24 |
Salisbury Street Bridge |
Extant |
Pratt truss |
1879 |
1970 |
Salisbury Street |
Chesapeake and Ohio Canal |
Williamsport |
Washington |
39°35′57″N 77°49′35″W |
MD-31 |
Chesapeake and Ohio Canal, Town Creek Aqueduct |
Extant |
Stone arch |
1849 |
1974 |
Chesapeake and Ohio Canal |
Town Creek |
Oldtown |
Allegany |
39°31′24″N 78°32′39″W |
MD-32 |
Chesapeake and Ohio Canal, Culvert 65 |
Extant |
Stone arch |
1832 |
1974 |
Chesapeake and Ohio Canal |
Unnamed stream |
Dickerson |
Montgomery |
39°11′38″N 77°28′12″W |
MD-35 |
Poffenberger Road Bridge |
Extant |
Whipple truss |
1878 |
1983 |
Poffenberger Road |
Catoctin Creek |
Middletown |
Frederick |
39°22′54″N 77°34′18″W |
MD-36 |
Old Mill Road Bridge |
Extant |
Pratt truss |
1882 |
1983 |
Old Mill Road |
Owens Creek |
Rocky Ridge |
Frederick |
39°36′07″N 77°20′19″W |
MD-37 |
Baltimore and Ohio Railroad, Long Bridge |
Demolished |
Trestle |
1869 |
1983 |
Baltimore and Ohio Railroad (former) |
Antietam Creek |
Keedysville |
Washington |
39°30′15″N 77°42′49″W |
MD-40 |
Keysville-Frederick County Road Bridge |
Replaced |
|
1873 |
|
Keysville-Frederick County Road |
Monocacy River |
Keymar |
Carroll |
39°39′16″N 77°16′01″W |
MD-41 |
National Road, Wilson Bridge |
Extant |
Stone arch |
1819 |
1982 |
National Road |
Conococheague Creek |
Hagerstown |
Washington |
39°39′27″N 77°50′53″W |
MD-44 |
Post Road Bridge |
Replaced |
Baltimore truss |
1905 |
1984 |
MD 7 |
Northeast Corridor |
Havre de Grace |
Harford |
39°32′11″N 76°06′49″W |
MD-46 |
Susquehanna River Bridge |
Extant |
Pennsylvania truss |
1908 |
1984 |
CSX Philadelphia Subdivision |
Susquehanna River |
Havre de Grace and Perryville |
Harford and Cecil |
39°34′08″N 76°05′13″W |
MD-52 |
Sharptown Bridge |
Replaced |
Swing span |
1912 |
1987 |
MD 313 |
Nanticoke River |
Sharptown |
Wicomico |
38°32′45″N 75°43′10″W |
MD-53 |
Cabin John Aqueduct Bridge |
Extant |
Stone arch |
1863 |
1987 |
MacArthur Boulevard and Washington Aqueduct |
Cabin John Creek |
Cabin John |
Montgomery |
38°58′22″N 77°08′53″W |
MD-68 |
Matthews Bridge |
Replaced |
Pennsylvania truss |
1914 |
1978 |
MD 146 (Dulaney Valley Road) |
Loch Raven Reservoir |
Baltimore |
Baltimore |
39°27′46″N 76°34′50″W |
MD-69 |
Chesapeake and Ohio Canal, White's Ferry Iron Bridge |
Abandoned |
Warren truss |
1865 |
1988 |
White's Ferry Road |
Chesapeake and Ohio Canal |
Dickerson |
Montgomery |
39°09′17″N 77°31′02″W |
MD-70 |
Chesapeake and Ohio Canal, Iron Bridge at Lock No. 68 |
Abandoned |
Warren truss |
1910 |
1988 |
|
Chesapeake and Ohio Canal |
Oldtown |
Allegany |
39°31′50″N 78°35′17″W |
MD-71 |
Chesapeake and Ohio Canal, McCoy's Ferry Road Culvert |
Extant |
Stone arch |
1840 |
1988 |
McCoy's Ferry Road |
Chesapeake and Ohio Canal |
Big Spring |
Washington |
39°36′31″N 77°58′12″W |
MD-72 |
Chesapeake and Ohio Canal, Prather's Neck Road Culvert |
Extant |
Stone arch |
1840 |
1988 |
Chesapeake and Ohio Canal |
Neck Road |
Big Spring |
Washington |
|
MD-79 |
Mitchell's Mill Bridge |
Relocated |
Pratt truss |
1885 |
1990 |
Carrs Mill Road |
Winter's Run |
Bel Air |
Harford |
39°32′06″N 76°24′02″W |
MD-82 |
Stauffer Road Bridge |
Relocated |
Pratt truss |
1930 |
1996 |
Stauffer Road |
Israel Creek |
Walkersville |
Frederick |
39°28′01″N 77°20′45″W |
MD-83 |
Waverly Street Bridge |
Replaced |
Bowstring arch truss |
1892 |
1991 |
Waverly Street |
George's Creek |
Westernport |
Allegany |
39°29′23″N 79°02′34″W |
MD-85 |
Governor's Bridge |
Extant |
Pratt truss |
1912 |
1992 |
Governor's Bridge Road |
Patuxent River |
Bowie |
Prince George's and Anne Arundel |
38°57′05″N 76°41′36″W |
MD-88 |
Glendale Road Bridge |
Demolished |
Pennsylvania truss |
1924 |
1992 |
Glendale Road |
Deep Creek Lake |
McHenry |
Garrett |
39°30′20″N 79°18′39″W |
MD-89 |
Hagerstown Road Bridge |
Relocated |
Pratt truss |
1920 |
1993 |
Old Hagerstown Road |
Little Catoctin Creek |
Middletown |
Frederick |
39°27′13″N 77°33′36″W |
MD-90 |
Crum Road Bridge |
Relocated |
Bowstring arch truss |
1890 |
1993 |
Crum Road |
Israel Creek |
Walkersville |
Frederick |
39°28′47″N 77°19′39″W |
MD-92 |
Carderock Overpass |
Exant |
Prestressed concrete girder |
1962 |
1994 |
Carderock Access Road |
Clara Barton Parkway |
Carderock |
Montgomery |
38°58′21″N 77°11′45″W |
MD-93 |
Seventy-Ninth Street Cabin John Underpass |
Extant |
Reinforced concrete rigid frame |
1961 |
1994 |
Clara Barton Parkway |
79th Street |
Cabin John |
Montgomery |
38°58′22″N 77°09′53″W |
MD-94 |
Cabin John Overpass |
Extant |
Prestressed concrete girder |
1962 |
1994 |
Erricson Road |
Clara Barton Parkway |
Cabin John |
Montgomery |
38°58′16″N 77°09′10″W |
MD-95 |
Cabin John Creek Bridge |
Extant |
Reinforced concrete box girder |
1963 |
1994 |
Clara Barton Parkway |
Cabin John Creek |
Cabin John |
Montgomery |
38°58′16″N 77°08′52″W |
MD-96 |
George Washington Memorial Parkway Northbound Lane Overpass |
Extant |
Reinforced concrete rigid frame |
1961 |
1994 |
Future George Washington Memorial Parkway |
Clara Barton Parkway |
Glen Echo |
Montgomery |
38°57′46″N 77°08′09″W |
MD-97 |
Sycamore Island Pedestrian Overpass |
Extant |
Reinforced concrete box girder |
1968 |
1994 |
Trail to Sycamore Island |
Clara Barton Parkway |
Cabin John |
Montgomery |
38°57′31″N 77°07′54″W |
MD-98 |
Brookmont Pedestrian Overpass |
Extant |
Reinforced concrete box girder |
1967 |
1994 |
Brookmont pedestrian crossing |
Clara Barton Parkway |
Glen Echo |
Montgomery |
38°56′22″N 77°07′14″W |
MD-99 |
Little Falls Branch Bridge |
Extant |
Prestressed concrete girder |
1961 |
1994 |
Clara Barton Parkway |
Little Falls Branch |
Glen Echo |
Montgomery |
38°56′15″N 77°07′03″W |
MD-100-A |
Suitland Parkway, Henson Creek Culvert Headwalls at Station 200 Plus 35 |
Extant |
Culvert |
1944 |
|
Suitland Parkway |
Henson Creek |
Suitland |
Prince George's |
38°50′10″N 76°53′59″W |
MD-100-B |
Suitland Parkway, Henson Creek Culvert Headwalls at Station 274 Plus 50 |
Extant |
Culvert |
1944 |
|
Suitland Parkway |
Henson Creek |
Suitland |
Prince George's |
38°49′51″N 76°52′30″W |
MD-106 |
Wilson Mill Bridge |
Replaced |
Parker truss |
1930 |
1994 |
MD 161 |
Deer Creek |
Darlington |
Harford |
39°37′01″N 76°12′04″W |
MD-108 |
Tilghman Island Bridge |
Relocated |
Rolling lift (Scherzer) bascule |
1934 |
1998 |
Chesapeake Bay Maritime Museum grounds |
Perry Cabin Lane |
Saint Michaels |
Talbot |
38°47′19″N 76°13′28″W\ |
MD-109 |
Proenty Road Bridge |
Replaced |
Pratt truss |
1926 |
1994 |
Proenty Road |
Jennings Run |
Corriganville |
Allegany |
39°41′29″N 78°48′13″W |
MD-110 |
Boston Street Bridge |
Extant |
Stone arch |
1902 |
1994 |
Boston Street |
Harris Creek |
Baltimore |
Baltimore |
39°16′49″N 76°34′48″W |
MD-112 |
Weems Creek Bridge |
Replaced |
Swing span |
1929 |
1995 |
MD 436 |
Weems Creek |
Annapolis |
Anne Arundel |
38°59′34″N 76°30′28″W |
MD-115 |
Western Maryland Railway Bridge |
Demolished |
Steel rolled stringer |
1932 |
1995 |
Western Maryland Railway |
MD 51 |
Spring Gap |
Allegany |
39°33′52″N 78°42′48″W |
MD-119 |
River Road Bridge |
Replaced |
Pratt truss |
1884 |
1993 |
Casselman River Road |
Casselman River |
Grantsville |
Garrett |
39°42′07″N 79°08′12″W |
MD-120 |
Harmony Road Bridge |
Replaced |
Pratt truss |
1918 |
1996 |
Harmony Road |
Little Catoctin Creek |
Myersville |
Frederick |
39°28′56″N 77°32′06″W |
MD-123 |
Chesapeake and Ohio Canal, Conococheague Creek Aqueduct |
Extant |
Stone arch |
1834 |
1996 |
Chesapeake and Ohio Canal |
Conococheague Creek |
Williamsport |
Washington |
39°36′05″N 77°49′41″W |
MD-124 |
Allender Road Bridge |
Replaced |
Steel built-up girder |
1945 |
1997 |
Allender Road |
CSX Philadelphia Subdivision |
White Marsh |
Baltimore |
39°24′03″N 76°24′25″W |
MD-125 |
Flintville Bridge |
Replaced |
Pratt truss |
1927 |
1998 |
MD 623 (Flintville Road) |
Broad Creek |
Castleton |
Harford |
39°41′46″N 76°14′41″W |
MD-127 |
Clarysville Bridge |
Extant |
Stone arch |
1812 |
1994 |
National Road |
Braddock Run |
Clarysville |
Allegany |
39°38′35″N 78°53′21″W |
MD-128 |
Little Crossings Bridge |
Extant |
Stone arch |
1813 |
1993 |
National Road |
Casselman River |
Grantsville |
Garrett |
39°41′48″N 79°08′37″W |
MD-170 |
Bollman Truss Bridge |
Extant |
Pratt truss |
|
2007 |
|
|
Westminster |
Carroll |
39°40′02″N 77°01′01″W |
MD-174 |
Gilpin's Falls Covered Bridge |
Extant |
Burr truss |
1860 |
2012 |
MD 272 (North East Road) (former) |
North East Creek |
North East |
Cecil |
39°38′56″N 75°57′20″W |
MD-180 |
Baltimore and Ohio Railroad, Locust Point Transfer Bridges |
Extant |
|
1911 |
2010 |
Baltimore and Ohio Railroad (former) |
|
Baltimore |
Baltimore |
39°16′29″N 76°35′20″W |
MD-183-B |
Chesapeake and Ohio Canal, Big Slackwater Towpath, Pipe Culvert |
Extant |
Culvert |
|
2005 |
Chesapeake and Ohio Canal towpath |
Unnamed stream |
Williamsport |
Washington |
|
MD-187 |
Jericho Road Covered Bridge |
Extant |
Burr truss |
1865 |
2015 |
Jericho Road |
Little Gunpowder Falls |
Kingsville and Jerusalem |
Baltimore and Harford |
39°27′34″N 76°23′16″W |
MD-190 |
Covered Bridge Educational Models |
Extant |
|
|
2017 |
Johns Hopkins University |
|
Baltimore |
Baltimore |
39°19′40″N 76°37′15″W |
MD-195 |
Baltimore and Ohio Railroad, Metropolitan Branch Bridge 9A |
Relocated |
Steel built-up girder |
1918 |
2019 |
Talbot Avenue |
CSX Metropolitan Subdivision |
Silver Spring |
Montgomery |
39°00′07″N 77°02′41″W |
WV-36 |
Baltimore and Ohio Railroad, Bollman Bridge |
Replaced |
Bollman truss |
1868 |
1987 |
Baltimore and Ohio Railroad (former) |
Potomac River |
Maryland Heights, Maryland, and Harpers Ferry, West Virginia |
Washington County, Maryland, and Jefferson County, West Virginia |
39°19′27″N 77°43′43″W |