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Masontown Bridge (Fayette County, Pennsylvania)
Built 1925; rehabilitated 1993
Lost through truss bridge over the Monogahela River on PA 21 in Masontown
Replaced by a new bridge in 2013

Mauch Chunk Street Bridge (Schuylkill County, Pennsylvania)
Built 1893; rehabilitated 1997
Stone arch bridge over Little Schuylkill River on Mauch Chunk Street in Tamaqua
Open to traffic

McArdle Viaduct No. 1 (Allegheny County, Pennsylvania)
Built 1933; rehabilitated 1960
Through truss bridge over the Norfolk Southern Railroad on Mcardle Roadway in Pittsburgh
Open to traffic

McAuley Bridge (Armstrong County, Pennsylvania)
Built 1912; rehabilitated 1973
Pony truss bridge over South Fork Pine Creek on TR 535
Replaced by a new bridge

McClaren Bridge (Washington County, Pennsylvania)
Built 1901; replaced 2000
Lost Pony truss bridge over Raccoon Creek on Kramer Road
Replaced by a new bridge

McClaren Road Bridge (Allegheny County, Pennsylvania)
Built 1948
Concrete tee beam bridge over Montour Run on McClaren Road
Open to traffic

McClintock Bridge (Venango County, Pennsylvania)
Built 1930; rehabilitated 1978
Through truss bridge over Oil Creek on PA 8 in Hasson Heights
Replaced by a new bridge

McConkey Road Bridge (Allegheny County, Pennsylvania)
Closed-spandrel arch bridge over Catfish Run on McConkey Road
Open to traffic

McConnell's Mill Covered Bridge 38-37-01 (Lawrence County, Pennsylvania)
Built 1874; rehabilitated 1957 and 1998
Covered bridge over Slippery Rock Creek in McConnells Mill State Park
Open to traffic

McConnells Mills Bridge (Butler County, Pennsylvania)
Built 1949; replaced 2010
Lost Deck girder bridge over US 422 (Benjamin Franklin Highway) on US 19 (Perry Highway)
Replaced by a new bridge

McCormick Run Bridge (Columbiana County, Ohio)
Built 1950; rehabilitated 1988
Pony truss bridge over West Fork Little Beaver on McCormick Run (TR 781)
Open to traffic

McEwen Road Bridge (Bradford County, Pennsylvania)
Built 1900
Lost through truss bridge over Sugar Creek on PA 3022 in North Towanda.
Removed but not replaced

McGrath Highway Bridge (Middlesex County, Massachusetts)
Built 1926 (NBI says 1908); rehabilitated 1983
Through truss bridge over MBTA/BMRR on MA 28 (McGrath Highway) in Somerville
Open to traffic

McIlvane Road I-70 Overpass (Washington County, Pennsylvania)
Built 1956; replaced 2010
Lost Beam bridge over I-70 on McIlvane Road (TR 818)
Replaced by a new bridge

McKee Street Bridge (Harris County, Texas)
Built 1932
Concrete girder bridge over Buffalo Bayou on McKee Street in Houston
Open to traffic

McKees Rocks Bridge (Allegheny County, Pennsylvania)
Built 1931; rehabilitated 1987
Steel through arch bridge over Ohio River on Chartiers Avenue in Pittsburgh
Open to traffic

McKees Rocks Bridge - Helen Street Span (Allegheny County, Pennsylvania)
Built 1931; rehabilitated 1987
Concrete rigid frame bridge over Helen Street on SR 3104 (Mckees Rocks Bridge)
Open to traffic

McKees Rocks Bridge - Railroad Spans (Allegheny County, Pennsylvania)
Built 1931; rehabilitated 1987
Steel through arch bridge over CSX Railroad on SR 3104 (Mckees Rocks Bridge)
Open to traffic

McKeesport-Duquesne Bridge (Allegheny County, Pennsylvania)
Built 1927 by the American Bridge Co.
Through truss bridge over the Monogahela River on PA 2114 at Duquesne in North Versailles
Open to traffic

McKinley Run Bridge (Beaver County, Pennsylvania)
Built 1904
Brick arch bridge over McKinley Run on Harmony Avenue
Unknown status

McLaughlin Run Road Bridge (Allegheny County, Pennsylvania)
Built 1905 by the King Bridge Co.
Lost through girder bridge over McLaughlin Run on McLaughlin Run Road
Replaced by a new bridge

McNally Bridge (Somerset County, Pennsylvania)
Built 1970; rehabilitated 2012
Deck girder bridge over Stonycreek River on US 219
Open to traffic

Mead Avenue Bridge (Crawford County, Pennsylvania)
Built 1871; additional trusses added 1912
Two-span Whipple through truss bridge over French Creek on Mead Avenue in Meadville
In storage or disassembled

Meadow River Bridge (Greenbrier County, West Virginia)
Built 1911
Lost concrete arch bridge over Meadow River on CR 2
Replaced by a new bridge

Meadow Run Road Bridge (Fayette County, Pennsylvania)
Built 1904 by York Bridge Co.
Pony truss bridge over Meadow Run on Meadow Run Road
Open to traffic

Meadow Street Bridge (Allegheny County, Pennsylvania)
Built 1910; reconstructed 1962-63
Open-spandrel arch bridge over Negley Run Blvd. on Meadow Street in Pittsburgh
Open to traffic

Meadowcroft Road Bridge (Washington County, Pennsylvania)
Built 1916
Concrete arch bridge over Cross Creek on PA 4018
Open to traffic

Memorial Bridge (Fayette County, Pennsylvania)
Built 1952; rehabilitated 1982 and 2010
Deck girder bridge over Youghiogheny River and CSX Keystone Subdivision on US 119
Open to traffic

Memorial Bridge (Old) (Rockingham County, New Hampshire)
Built 1923, rehabilitated 1982, closed to vehicle traffic in 2011
Lost vertical lift bridge over Piscataqua River on US 1 in Portsmouth
Demolished.

Memorial Drive Bridge (Middlesex County, Massachusetts)
Built 1940; rehabilitated 1982
Girder bridge over Brookline Street on US 3 (Memorial Drive)
Open to traffic

Mercer Pike Bridge (Crawford County, Pennsylvania)
Built 1888; rehabilitated 1938/1944
Through truss bridge over Conneaut Outlet on PA 2003
Replaced by a new bridge

Mercer Street Bridge (Crawford County, Pennsylvania)
Built 1936; rehabilitated 1984
Through truss bridge over French Creek on Mercer Street in Meadville
Open to traffic

Mercer Street Extension Bridge (Butler County, Pennsylvania)
Pratt through truss bridge over Connoquenessing Creek on Mercer Street Extension
Intact but closed to all traffic

Meshoppen Creek Bridge (Wyoming County, Pennsylvania)
Built 1934; rehabilitated ca. 1985
Through truss bridge over Meshoppen Creek on PA 267 in Meshoppen
Open to traffic

Messerall Road Bridge (Crawford County, Pennsylvania)
Built 1876 by the Wrought Iron Bridge Co.; rehabilitated 1960
Bowstring through truss bridge over Pine Creek on Messerall Road
Moved from original location for rehabilitation and relocation.

Mickey Bridge (Somerset County, Pennsylvania)
Built 1912
Concrete arch bridge over Fall Creek on TR 338 (Fall Creek Road)
Open to traffic

Middle Creek Bridge (Somerset County, Pennsylvania)
Built 1927; rehabilitated 1958/1994
Concrete arch bridge over Middle Creek on PA 281
Open to traffic

Middle Road Bridge (Allegheny County, Pennsylvania)
Built 1952; rehabilitated 1985
Lost Pony/through plate girder bridge over I-76 (Pennsylvania Turnpike) on Middle Road
Replaced by a new bridge

Midland Fredericktown Road Bridge (Columbiana County, Ohio)
Built 1893 by the Penn Bridge Co.; rehabilitated 2004
Through truss bridge over North Fork Little Beaver Creek on Midland Fredericktown Road (TR 1038) in Calcutta
Open to traffic

Milford Bridge (Somerset County, Pennsylvania)
Built 1900
Pratt pony truss bridge over Coxes Creek on Abandoned TR486
Open to pedestrians

Mill Bridge (Westmoreland County, Pennsylvania)
Built 1938; rehabilitated 1992
Through truss bridge over Kiskiminetas River on Mill Bridge Road in West Leechburg
Open to traffic

Mill Creek Bridge (Luzerne County, Pennsylvania)
Built 1929; rehabilitated 1985
Through truss bridge over Mill Creek and RRs on US 11 in Dupont
Open to traffic

Mill Creek Bridge (Venango County, Pennsylvania)
Built ca. 1885 by the Smith Bridge Co.
Lost Pratt pony truss bridge over Mill Creek on TR 522 (Dotter Road)
Replaced by a new bridge on the old substructure

Mill Hill Road Bridge (Luzerne County, Pennsylvania)
Built 1907-11 by Penn Bridge Co.
Pony truss bridge over Nescopeck Creek on Mill Hill Road (TR 336)
No longer exists; rep[laced by new UECB?

Mill Mountain Road Bridge (Luzerne County, Pennsylvania)
Built 1883 by the Penn Bridge Co.; rehabilitated 2011; Replaced and stored 2021.
Pratt pony truss bridge over Nescopeck Creek on Mill Mountain Road (TR 356)
Currently being replaced and placed in storage for reuse.

Mill Mountain Road Nescopeck Creek Tributary Bridge (Luzerne County, Pennsylvania)
Slab bridge over Nescopeck Creek on Mill Mountain Road (TR 356)
Open to traffic

Mill Road Bridge (Chester County, Pennsylvania)
Built 1912
Stone arch bridge over Valley Creek on Mill Road
Open to traffic

Mill Street Bridge (Washington County, Pennsylvania)
Built 1908 by American Bridge Co.
Pony truss bridge over Norfolk Southern Railway on Mill Street (Old PA 88) in Fredericktown-Millsboro
Derelict/abandoned

Mill Street Bridge (Mercer County, Pennsylvania)
Demolished 2008
Lost Parker through truss bridge over Shenango River on Mill Street
Removed but not replaced

Miller Farm Bridge (Venango County, Pennsylvania)
Built 1888 by Massillon Bridge Co.
Through truss bridge over Oil Creek on TR 635 (Miller Farm Road)
Open to traffic

Miller Station Road Bridge (Crawford County, Pennsylvania)
Built 1887 by the Wrought Iron Bridge Co.
Through truss bridge over French Creek on PA 1016
Replaced

Milltown High Street Bridge (Warren County, Pennsylvania)
Built 1937; rehabilitated 1982
Pony truss bridge over Tionesta Creek on PA 2002 (High Street) in Milltown
Open to traffic

Milroy Street Bridge (Allegheny County, Pennsylvania)
Built 1986
Steel stringer bridge over I-279 (Parkway North) on Milroy Street
Open to traffic

Miner Slough Bridge (1933) (Solano County, California)
Built 1933; rehabilitated 1953
Swing bridge over Miner Slough on CA 84
Open to traffic

Moffett Mill Bridge (Beaver County, Pennsylvania)
Built 1929
Lost through truss bridge over Raccoon Creek on Moffet Mill Road
Replaced by a new bridge

Mohr Road Bridge (Greene County, Pennsylvania)
Built 1903
Pony truss bridge over Muddy Creek on TR 634
Open to traffic

Mokelumne River Bridge (San Joaquin County, California)
Built 1942; rehabilitated 1978
Swing bridge over Mokelumne River on CA 12
Open to traffic

Monaca-East Rochester Bridge (Beaver County, Pennsylvania)
Built 1959; rehabilitated 1993
Through truss bridge over the Ohio River on Pennsylvania Avenue in Monaca
Open to traffic

Montebello Road Bridge (Perry County, Pennsylvania)
Built ca. 1890
Brick arch bridge over Little Juniata Creek on Montebello Road
Open to traffic

Montopolis Bridge (1938) (Travis County, Texas)
Built 1938; closed to vehicles in 2018
Parker through truss bridge over Colorado River on US 183 Southbound Frontage Road in Austin
Open to pedestrians only

Montour Park Road Bridge (Allegheny County, Pennsylvania)
Pratt pony truss bridge over Montour Run on Montour Park Road (abandoned)


Montour Run Bridge (Columbia County, Pennsylvania)
Built ca. 1880; rehabilitated 1927
Stone arch bridge over Montour Run on TR 356 in Bloomsburg
Open to traffic

Montour Trail - Beagle Club Road Tunnel (Washington County, Pennsylvania)
Built 1913
Closed-spandrel arch bridge over Beagle Club Road on Montour Trail (Former Montour Railroad)
Open to pedestrians only

Montour Trail - Donaldson Road Tunnel (Washington County, Pennsylvania)
Built 1913
Closed-spandrel arch bridge over Donaldson Road on Montour Trail (Former Montour Railroad)
Open to pedestrians only

Montour Trail - McDonald Viaduct (Washington County, Pennsylvania)
Built 1913; rehabilitated 2003
Warren through truss bridge over Robinson Run and Panhandle Trail on Montour Trail (Former Montour Railroad)
Open to pedestrians only

Montour Trail Bridge Near Montour Park Road (Allegheny County, Pennsylvania)
Built ca. 1926
Deck plate girder bridge over Montour Run on Montour Trail
Open to pedestrians only

Montoursville Bridge (Lycoming County, Pennsylvania)
Built 1931; rehabilitated 1994
Three-span through truss bridge over Loyalsock Creek on PA 2014 in Montoursville
Open to traffic

Moore's Crossing Bridge (Travis County, Texas)
Three 1884 Whipple through truss spans relocated here and installed by the Austin Bridge Company along with a new pony truss approach span in 1922; Closed to vehicular traffic in 1980
Through truss bridge over Onion Creek on Moores Bridge Rd
Open to pedestrians

Morganza Road Bridge (Washington County, Pennsylvania)
Built 1924; rehabilitated 1983
Concrete arch bridge over Chartiers Creek on PA 1009 in Cecil
Open to traffic

Morris Road Bridge (Crawford County, Pennsylvania)
Built ca. 1935
Pony truss bridge over Western New York and Pennsylvania Railroad tracks on TR 653
Removed but not replaced

Moser Road Bridge (Somerset County, Pennsylvania)
Built 1900
Pinned Pratt Thru Truss bridge over Casselman River on TR 353 (Moser Road)
Open to traffic

Moshannon Creek Bridge (Clearfield County, Pennsylvania)
Built 1940; rehabilitated 1971
Pony truss bridge over Moshannon Creek on W. Presqueisle Street in Chester Hill
Open to traffic

Mossdale Bridge (1917) (San Joaquin County, California)
Built 1917; Replaced 1926
Lost Pratt through truss bridge over San Joaquin River on Road
Replaced by a new bridge

Mossdale Bridge (1949) (San Joaquin County, California)
Built 1949;
Warren through truss bascule bridge over San Joaquin River
Open to traffic

Mosside Boulevard Bridge (Allegheny County, Pennsylvania)
Built 1930; rehabilitated 1972; replaced 2007
Lost cantilevered through girder bridge over Turtle Creek on Mosside Blvd.
Replaced by a new bridge

Mosside Boulevard Bridge Approach (Allegheny County, Pennsylvania)
Built 1930; replaced 2007
Lost Deck girder bridge over Service Road on Mosside Blvd.
Replaced by a new bridge

Mostoller Bridge (Somerset County, Pennsylvania)
Built 1937; rehabilitated 1949; replaced 2014
Lost Steel stringer bridge over Stonycreek River on Pompey Hill Road (SR 1008)
Replaced by a new bridge

Moundsville Bridge (Marshall County, West Virginia)
Built 1986
Steel through arch bridge over Ohio River on WV 2 Spur/OH 872
Open to traffic

Mount Jackson Road Bridge (Lawrence County, Pennsylvania)
Built 1924; replaced 2001
Lost Pratt through truss bridge over Mahoning River on Mount Jackson Road (PA 108)
Replaced by a new bridge

Mountville Road Bridge (Lawrence County, Pennsylvania)
Built 1940
Through truss bridge over Slippery Rock Creek on Mountville Road
Open to traffic

Mt. Bonnell Road Bridge (Travis County, Texas)
Built 1923 by the Austin Bridge Co.
Pony truss bridge over Water Plant Road on Mt. Bonnell Road in Austin
Open to Pedestrians

Mt. Davis Road Bridge (Somerset County, Pennsylvania)
Built 1924; replaced 2015
Lost Concrete tee beam bridge over Elk Lick Creek on SR 2004 (Mt. Davis Road)
Replaced by a new bridge

Muddy Creek Bridge (Crawford County, Pennsylvania)
Built ca. 1900
Pony truss bridge over Muddy Creek on TR 743
Closed to all traffic after failing inspection

Muddy Creek Bridge (Crawford County, Pennsylvania)
Built 1895; rehabilitated 1996
Pony truss bridge over Muddy Creek on TR 776
Removed but not replaced

Muddy Creek Bridge (Greene County, Pennsylvania)
Built 1921; Replaced 2014
Lost Concrete arch bridge over Muddy Creek on PA 88 in Fairdale
Replaced by a new bridge

Muleshoe Curve Bridge (Blair County, Pennsylvania)
Built 1902; rail line abandoned by Conrail in 1981
Stone arch bridge over Old Route 22 on 6 to 10 trail
Open to pedestrians only

Murray Avenue Bridge (Allegheny County, Pennsylvania)
Built 1978
Steel rigid frame bridge over Beechwood Blvd. & I-376 Ramp G on Murray Avenue Bridge
Open to traffic

Nallen Bridge (Fayette County, West Virginia)
Lost Closed-spandrel arch bridge over Meadow River
Removed but not replaced

Narrows Bridge (Bedford County, Pennsylvania)
Built 1935 by the Pittsburg Construction Co.
Open-spandrel arch bridge over Raystown Branch of Juniata River on US 30
Open to traffic

Nashua Road Bridge (Lawrence County, Pennsylvania)
Built 1981; replaced 2010
Lost Deck girder bridge over Shenango River on Nashua Road
Replaced by a new bridge

National Road Bridge over Branch of Buffalo Creek (Washington County, Pennsylvania)
Built 1929; replaced 2009
Lost Concrete tee beam bridge over Branch of Buffalo Creek on US 40 (National Road)
Replaced by a new bridge

Navarro Street Bridge (Mid) (Bexar County, Texas)
Built 1922 by the Virginia Bridge & Iron Co.
Pony truss bridge over San Antonio River on Navarro Street in San Antonio
Open to traffic

Navarro Street Bridge (S) (Bexar County, Texas)
Built 1922
Concrete arch bridge over San Antonio River on Navarro Street in San Antonio
Open to traffic

Nebraska Bridge (Forest County, Pennsylvania)
Built 1933; rehabilitated 1999
Through truss bridge over Tionesta Dam Creek on Golinza Road
Open to traffic

Neff Bridge (Huntingdon County, Pennsylvania)
Built 1889; rehabilitated 1974
Through truss bridge over Frankstown Branch Juniata River on PA 4005
Open to traffic

Negley Bridge (Columbiana County, Ohio)
Built 1882 by the Columbia Bridge Works of Dayton, Ohio
Through truss bridge over North Fork Little Beaver Creek on Carmel Achor Road (TR 1026)
Open to traffic

Nescopeck Creek Bridge (Luzerne County, Pennsylvania)
Built 1936; rehabilitated 1986
Pony truss bridge over Nescopeck Creek on PA 93
Replaced by a new bridge

Nescopeck Creek Bridge (Luzerne County, Pennsylvania)
Built 1907-11 by Penn Bridge Co.; rehabilitated ca. 1925
Pony truss bridge over Nescopeck Creek on TR 388
Demolished and replaced.

Neshannock Creek Bridge (Mercer County, Pennsylvania)
Built 1922
Through truss bridge over Neshannock Creek on TR 401 (Old Mercer Road)
Open to traffic

Neshannock Creek Bridge (Mercer County, Pennsylvania)
Built 1927; rehabilitated 1990
Pony truss bridge over Neshannock Creek on PA 2002 (Leesburg Road)
Open to traffic