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This is a list of bridges and tunnels on the National Register of Historic Places in the U.S. state of Maryland.^[1]

Name	Built	Listed	Location	County	Type
B & O Railroad Potomac River Crossing	1894, 1931	February 14, 1978	Harpers Ferry, West Virginia 39°19′27″N 77°43′43″W / 39.32417°N 77.72861°W / 39.32417; -77.72861	Washington
B & O Bridge	ca. 1867	November 23, 1977	Keedysville 39°30′15″N 77°42′49″W / 39.50417°N 77.71361°W / 39.50417; -77.71361 (B & O Bridge)	Washington
Bennies Hill Road Bridge	ca. 1889	June 27, 1979	Middletown 39°24′34″N 77°34′12″W / 39.40944°N 77.57000°W / 39.40944; -77.57000 (Bennies Hill Road Bridge)	Frederick	Bowstring arch truss
Bloomington Viaduct	1851, 1916	November 21, 1976	Bloomington 39°28′37″N 79°4′5″W / 39.47694°N 79.06806°W / 39.47694; -79.06806 (Bloomington Viaduct)	Garrett	Multispan masonry bridge
Bollman Suspension and Trussed Bridge	1869	October 18, 1972	Savage 39°8′5″N 76°49′31″W / 39.13472°N 76.82528°W / 39.13472; -76.82528	Howard	Bollman Truss
Bullfrog Road Bridge	1908	November 21, 1978	Taneytown 39°41′44″N 77°14′25″W / 39.69556°N 77.24028°W / 39.69556; -77.24028 (Bullfrog Road Bridge)	Carroll	Parker truss
Carrollton Viaduct	1828, 1829	November 11, 1971	Baltimore 39°16′31″N 76°39′19″W / 39.27528°N 76.65528°W / 39.27528; -76.65528 (Carrollton Viaduct)	Baltimore City
Casselman's Bridge, National Road	1813	October 15, 1966	Grantsville	Garrett	Single arch
Crum Road Bridge	ca. 1880	December 28, 1978	Walkersville 39°28′47″N 77°19′39″W / 39.47972°N 77.32750°W / 39.47972; -77.32750 (Crum Road Bridge)	Frederick	Bowstring arch truss
Fourpoints Bridge	ca. 1876	November 29, 1978	Emmitsburg 39°40′17″N 77°18′4″W / 39.67139°N 77.30111°W / 39.67139; -77.30111 (Fourpoints Bridge)	Frederick	Pratt truss
Gilpin's Falls Covered Bridge	ca. 1855	December 3, 2008	North East 39°38′55.8″N 75°57′20.1″W / 39.648833°N 75.955583°W / 39.648833; -75.955583 (Gilpin's Falls Covered Bridge)	Cecil	Burr Arch Through Truss
Howard Street Tunnel	1890, 1895	July 2, 1973	Baltimore 39°18′17″N 76°37′15″W / 39.30472°N 76.62083°W / 39.30472; -76.62083 (Howard Street Tunnel)	Baltimore City	Brick-lined tunnel with iron-arched centerings
Jericho Covered Bridge	1865, 1937	September 13, 1978	Jerusalem, Kingsville 39°27′34″N 76°23′16″W / 39.45944°N 76.38778°W / 39.45944; -76.38778 (Jericho Covered Bridge)	Baltimore, Harford	Burr Arch Through Truss
LeGore Bridge	1898-1900	September 18, 1978	Woodsboro 39°34′50″N 77°18′50″W / 39.58056°N 77.31389°W / 39.58056; -77.31389 (LeGore Bridge)	Frederick	Five-span stone arch
Lombard Street Bridge	1877, 1974	September 27, 1972	Baltimore 39°19′0″N 76°42′1″W / 39.31667°N 76.70028°W / 39.31667; -76.70028 (Lombard Street Bridge)	Baltimore City	Water-main truss
Loys Station Covered Bridge	ca. 1860	June 23, 1978	Thurmont 39°36′26″N 77°21′8″W / 39.60722°N 77.35222°W / 39.60722; -77.35222 (Loys Station Covered Bridge)	Frederick	Covered Multiple king post
Old Mill Road Bridge	1882	March 7, 1979	Rocky Ridge 39°36′7″N 77°20′19″W / 39.60194°N 77.33861°W / 39.60194; -77.33861 (Old Mill Road Bridge)	Frederick	Pratt truss
Patterson Viaduct Ruins	1829	June 3, 1976	Catonsville, Ilchester 39°15′0″N 76°45′51″W / 39.25000°N 76.76417°W / 39.25000; -76.76417 (Patterson Viaduct Ruins)	Baltimore, Howard	Masonry Arch Bridge
Poffenberger Road Bridge	1878	November 29, 1978	Middletown 39°22′54″N 77°34′18″W / 39.38167°N 77.57167°W / 39.38167; -77.57167 (Poffenberger Road Bridge)	Frederick	Pratt or Whipple thru truss
Roddy Road Covered Bridge	ca. 1860	June 23, 1978	Thurmont 39°38′26″N 77°23′39″W / 39.64056°N 77.39417°W / 39.64056; -77.39417 (Roddy Road Covered Bridge)	Frederick	Covered Single king post
Thomas Viaduct, Baltimore & Ohio Railroad	1835	October 15, 1966	Relay 39°13′19″N 76°42′49″W / 39.22194°N 76.71361°W / 39.22194; -76.71361	Baltimore, Howard	Multiple stone arch
Union Arch Bridge (Cabin John Aqueduct)	1864	February 28, 1973	Cabin John 38°58′22.28″N 77°8′52.69″W / 38.9728556°N 77.1479694°W / 38.9728556; -77.1479694 (Cabin John Bridge)	Mongtomery	Masonry arch
Utica Covered Bridge	ca. 1860	June 23, 1978	Thurmont 39°31′28″N 77°23′46″W / 39.52444°N 77.39611°W / 39.52444; -77.39611 (Utica Covered Bridge)	Frederick	Covered Burr arch truss
Waverly Street Bridge	1892	September 7, 1984	Westernport 39°29′23″N 79°2′34″W / 39.48972°N 79.04278°W / 39.48972; -79.04278 (Waverly Street Bridge)	Allegany	bowstring arch truss
Wilson's Bridge	1819	March 15, 1982	Hagerstown 39°39′27″N 77°50′53″W / 39.65750°N 77.84806°W / 39.65750; -77.84806 (Wilson's Bridge)	Washington