Main Street Bridge (Duval County, Florida)
Built 1941
Vertical lift bridge over St. Johns River on US 1 (Main Street) in Jacksonville
Open to four-lane traffic

Manzanola Bridge (Otero County, Colorado)
Originally built 1911 by the Patterson-Burghardt Bridge Co. over the Colorado River at Clifton near Grand Junction. Relocated here in 1950; replaced 1984.
Lost through truss bridge over the Arkansas River on CO 207
Replaced by modern bridge

Marais Ditch Route B Bridge (Bates County, Missouri)
Built 1934; rehabilitated 1952
Pony truss bridge over Marais des Cygnes River Drainage Ditch on Route B
Open to traffic

Marais River Route B Bridge (Bates County, Missouri)
Built 1934
Pony truss bridge over Marais des Cygnes River on Route B
Open to traffic

Marble Creek MO E (Madison County, Missouri)
Bridge over Marble Creek on Mo E
Open to traffic

Marion Memorial Bridge (Marion County, Tennessee)
Built 1929; tolls removed 1947; rehabilitated 1966
Through truss bridge over Nickajack Lake (Tennessee River) on US 41/US 64/US 72/TN 2 (Dixie Highway)
Open to two-lane traffic

Mark Twain Bridge (Marion County, Missouri)
Opened Sept. 4, 1936; tolls removed Oct. 30, 1940; rehabilitated 1982; replaced and demolished 2000
Lost through truss bridge over the Mississippi River on US 36 at Hannibal
Replaced by the new I-72 bridge

Market Street Bridge (Hamilton County, Tennessee)
Built 1917
Bascule bridge over Tennessee River on Market Street (State Highway 8) in Chattanooga
Rehabilitated in 2006

Market Street Bridge (Jefferson County, Ohio)
Built 1904; rehabilitated 1981
Suspension bridge over the Ohio River on WV 2 Spur (Market Street) in Steubenville
Open to traffic

Marquam Bridge (Multnomah County, Oregon)
Built 1966, Seismic Retrofit 1996
Deck truss bridge over Willamette River on I-5 in Portland
Open to traffic

Marshall Road Bridge (Orleans County, New York)
Built 1909
Through truss bridge over Erie Canal on Marshall Road, west of Medina
Open to traffic

Martin Bridge (Ouachita County, Arkansas)
Lost swing through truss bridge over Ouachita River at Camden
Replaced in 1947 by the Ben Laney Bridge

Martin Luther King Bridge (St. Louis, Missouri)
Built 1951; rehabilitated 1987
Cantilevered through truss over the Mississippi River in downtown St. Louis
Open to four-lane traffic

Massac Creek Bridge (Massac County, Illinois)
Wooden bridge over Massac Creek within Fort Massac State Park in Metropolis
Open to one-lane traffic

Maucks Pond IN 64 Bridge (Gibson County, Indiana)
Built 1931; rehabilitated 1979
Through truss bridge over Maucks Pond on IN 64
Open to traffic

Maumelle River AR 300 Bridge (Pulaski County, Arkansas)
Made obsolete by a new bridge in 1981
Through truss bridge over Maumelle River on AR 300
Open to pedestrians only

McClugage Bridge (Peoria County, Illinois)
Eastbound bridge built 1948; westbound bridge built 1982
Pair of cantilevered through truss bridges over the Illinois River on US 24/US 150 in Peoria
Open to four lanes of traffic

McCutcheon Road Bridge (St. Louis County, Missouri)
Built 1944; demolished Summer 2008
Lost concrete frame bridge over I-64/US 40 on McCutcheon Road in Ladue
No longer exists

McGirt's Bridge (Bladen County, North Carolina)
Built 1923 by the Atlantic Bridge Co.; replaced ca. 1983
Lost through truss bridge over Cape Fear River on US 701
Replaced by a new bridge

McKenzie Creek MO 49 Bridge (Wayne County, Missouri)
Built 1929
Pony truss bridge over McKenzie Creek on MO 49 south of Gads Hill
Open to traffic

McLean Branch MO 79 Bridge (Lincoln County, Missouri)
Built 1938
Through truss bridge over McLean Branch on MO 79 at Winfield
Open to traffic

Medora Covered Bridge (Jackson County, Indiana)
Built 1875 by J.J. Daniels; closed to traffic in 1972
Three-span covered bridge over East Fork White River just off IN 235, east of Medora
Open to pedestrians only

Memphis-Arkansas Bridge (Shelby County, Tennessee)
Built 1949
Cantilevered through truss bridge over the Mississippi River on I-55 at Memphis
Open to four lanes of traffic

Meramec River MO 19 Bridge (Crawford County, Missouri)
Built 1925 by the Federal Bridge Co.; replaced 2000
Lost five-span closed-spandrel arch bridge over Meramec River on MO 19
Replaced by a modern bridge

Meramec River MO 21 Bridge (St. Louis County, Missouri)
Built 1940
Steel through arch bridge over the Meramec River on MO 21
Open to four lanes of traffic

Meramec River US 66 Bridge (St. Louis County, Missouri)
Built 1931
Deck truss bridge over Meramec River at Times Beach on Old US 66 in Wildwood
Open to traffic on a frontage road within Route 66 State Park

Meridian Bridge (Sutter County, California)
Built 1977
Swing bridge over Sacramento Riv(Meridian) on CA 20
Open to traffic

Meridian Bridge (Yankton County, South Dakota)
Built 1924; rehabilitated 1953
Vertical-lift through truss bridge over the Missouri River on US 81 at Yankton
Open to traffic

Messmer Street Bridge (Scott County, Missouri)
Concrete bridge on Messmer Street (Old US 61) over a branch of Ramsey Creek just north of Kelso
Open to traffic

Miami Bridge (Saline County, Missouri)
Built 1939; rehabilitated 1983
Cantilevered through truss bridge over the Missouri River on MO 41 at Miami
Open to traffic

Middle Fork AR 7 Bridge (Garland County, Arkansas)
Built 1933 by the Ault-Rich Construction Co. of Cassville, Missouri
Two-span open-spandrel arch bridge over Middle Fork Saline River on AR 7
Open to two-lane traffic

Middle Fork Smith River Bridge (Del Norte County, California)
Built 1925; rehabilitated 1972
Concrete arch bridge over Middle Fork Smith River on US 199
Open to traffic

Middle River Route 774 Bridge (Augusta County, Virginia)
Built 1903
Through truss bridge over Middle River on Route 774
Open to one-lane traffic

Middle River Route 775 Bridge (Augusta County, Virginia)
Built 1908
Through truss bridge over Middle River on Route 775
Open to traffic

Middle River Route 778 Bridge (Augusta County, Virginia)
Built 1915 by the Champion Bridge Co.
Through truss bridge over Middle River on Route 778
Open to traffic

Middle River VA 256 Bridge (Augusta County, Virginia)
Built 1907 by the Champion Bridge Co.
Three-span through truss bridge over Middle River on VA 256
Closed to all traffic

Mill Creek Bridge (Washington County, Missouri)
Built 1935
Concrete tee beam bridge over Mill Creek on Route M
Open to traffic

Mill Creek Bridge (Wasco County, Oregon)
Built 1948
Deck truss bridge over Mill Creek on US 26
Open to traffic

Mill Creek Bridge Highway M (Washington County, Missouri)
Bridge over Mill Creek on Route M
Open to traffic

Mill Creek MO 47 (Washington County, Missouri)
Built 1964
Steel stringer bridge over Mill Creek on Mo 47 S
Open to traffic

Mill Creek Park Suspension Bridge (Mahoning County, Ohio)
Built 1895 by the Youngstown Bridge Co.
Suspension bridge over Mill Creek in Mill Creek Park at Youngstown
Open to traffic

Miller Creek Bridge (Alexander County, Illinois)
Built 1933
Pony truss bridge over Miller Creek on Old Illinois Route 3 northeast of Thebes, 1 mi. north of Thebes
Open to two-lane traffic

Millers Bridge (Butler County, Missouri)
Built 1924
Pony truss bridge over Cane Creek on Route PP (Old US 60) west of Poplar Bluff
Open to two-lane traffic

Millersville Bridge (Cape Girardeau County, Missouri)
Built 1923; rehabilitated 1975
Two-span through truss bridge over Whitewater River on MO 72 at Millersville
Open to two-lane traffic on a paved road

Million Dollar Bridge (Valdez-Cordova Census Area, Alaska)
Built 1910 on the CR&NW Railroad; closed 1938; reopened as a highway bridge in 1958; fourth span collapsed in earthquake on March 27, 1964, collapsed span repaired 2005
Four-span through truss bridge over Copper River on Copper River Highway
Open to one-lane traffic

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

Milwaukee River Bridge (Ozaukee County, Wisconsin)
Built 1928, Replaced 2005
Truss bridge over Milwaukee River on Green Bay Street (WI 33) in Saukville
Demolished - Replaced by concrete slab

Mingo Ditch Route T Bridge (Stoddard County, Missouri)
Built 1955
Steel stringer bridge with wooden piers over Mingo Ditch on Route T
Open to two-lane traffic

Mission Bridge over the Los Angeles River (Los Angeles County, California)
Built 1944; rehabilitated 1955
Concrete arch bridge over Los Angeles River on US 101 in Los Angeles
Open to traffic

Mississippi River Bridge (Grant County, Wisconsin)
Built 1982
Steel through arch bridge over Mississippi River on US 61/US 151
Open to traffic

Mississippi River I-35W Bridge (Hennepin County, Minnesota)
Built 1967; collapsed Aug. 1, 2007
Collapsed deck truss bridge over the Mississippi River on I-35W in Minneapolis
Collapsed

Mississippi River I-40 Bridge (Shelby County, Tennessee)
Built 1973
Two-span steel through arch bridge over the Mississippi River on I-40 at Memphis
Open to traffic

Mississippi River US 61 Bridge (Dubuque County, Iowa)
Built 1982
Steel through arch bridge over the Mississippi River on US 61 and US 151
Open to traffic

MoDOT Bridge (Cole County, Missouri)
Built ca. 1920; rehabilitated 1990
Closed pony truss bridge over Wears Creek off MoDOT Drive in Jefferson City
Closed to all traffic and posted against trespassing

Moffett Creek Bridge (Multnomah County, Oregon)
Built in 1915 by A. Guthrie and Company, Abandoned in the 1940 and is now part of Historic Columbia River Highway trail.
Closed-spandrel arch bridge over Moffett Creek on Historic Columbia River Highway (Abandoned)
Open to pedestrians

Monett Business US 60 Bridge (Barry County, Missouri)
Built 1935
Through truss bridge over the railroad on Business US 60 east of Monett
Open to two-lane traffic

Montezuma Bridge (Parke County, Indiana)
Built 1949; rehabilitated 1987
Six-span through truss bridge over Wabash River on US 36 at Montezuma
Open to two-lane traffic

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

Morrilton Bridge (Conway County, Arkansas)
Lost swing through truss bridge over Arkansas River on AR 9 at Morrilton
No longer exists

Morris Bridge (Grundy County, Illinois)
Built 1934; rehabilitated 1978; replaced 2002
Lost five-span through truss bridge over the Illinois River on IL 47 at Morris
Replaced by modern bridge

Morrison Bluff Bridge (Logan County, Arkansas)
At 1.6 miles this is the longest bridge in Arkansas
Bridge over Arkansas River on AR 109 at Morrison Bluff
Open to traffic

Morton Creek AR 341 Bridge (Baxter County, Arkansas)
Built 1929; replaced 2004
Lost pony truss bridge over Morton Creek on AR 341 north of Norfolk in Salesville
Replaced by a new bridge

Mosier Creek Bridge (Wasco County, Oregon)
Built 1920
Concrete arch bridge over Mosier Creek on HWY 100 in Mosier
Open to traffic

Mosier Tunnel (Wasco County, Oregon)
Built 1920, Closed due to rock fall problems 1953, Reopened to public in 2000
Tunnel under Mosier Tunnel on Historical Columbia River Highway Trail
Open to pedestrians

Mossy Creek Route 613 Bridge (Augusta County, Virginia)
Built 1910
Pony truss bridge over Mossy Creek on Route 613
Open to traffic

Moundsville WV 2 Spur Over Ohio River (Marshall County, West Virginia)
Built 1986
Steel through arch bridge over Thmpsn Av;Lckwd Av;Ohior on Wv 2 Spur
Open to traffic

Mount Carmel Bridge (Wabash County, Illinois)
Built 1932; rehabilitated 1987
Through truss bridge over Wabash River on IL 15/IN 64 in Mount Carmel
Open to traffic

Mount Sterling Bridge (Gasconade County, Missouri)
Lost through truss bridge over Gasconade River at Mount Sterling on US 50
Replaced 1979

Mountain Fork River Bridge (McCurtain County, Oklahoma)
Built 1948
Through truss bridge over Mountain Fork River on US 70
Open to traffic

Mulberry River AR 23 Bridge (Franklin County, Arkansas)
Built 1935 by McEachin and McEachin, Inc., of Little Rock
Three-span pony truss bridge over Mulberry River on AR 23
Open to traffic

Mulberry River US 64 Bridge (Crawford County, Arkansas)
Built 1929; rehabilitated 1961
Three-span open-spandrel arch bridge over Big Mulberry River on US 64 in Mulberry
Open to traffic

Mulholland Drive over the Hollywood Freeway (Los Angeles County, California)
Built 1940
Concrete tee beam bridge over Hollywood Freeway (US 101) on Mulholland Drive in Los Angeles
Open to traffic

Multnomah Creek Bridge (Multnomah County, Oregon)
Built 1914
Concrete arch bridge over Multnomah Creek on Historical Columbia River Highway
Open to traffic

Murray Baker Bridge (Peoria County, Illinois)
Built 1958; rehabilitated 1984 and 2005
Cantilevered through truss bridge over Illinois River on I-74 in Peoria
Open to traffic

Muscatatuck River IN 256 Bridge (Washington County, Indiana)
Built 1941; rehabilitated 1982
Through truss bridge over Muscatatuck River on IN 256
Open to traffic

Muscatatuck River IN 256 Bridge #2 (Jackson County, Indiana)
Built 1941
Parker through truss bridge over Muscatatuck River on IN 256
Open to traffic

Myers Creek Bridge (Forrest County, Mississippi)
Built 1934
Steel stringer bridge over Myers Creek on US 49 (Northbound Traffic)
Open to traffic

Myrtle Creek Bridge (Del Norte County, California)
Built 1984
Concrete arch bridge over Myrtle Creek on US 199
Open to traffic

Narrow 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

Narrows Bridge (Cleburne County, Arkansas)
Built 1961 in conjunction with the creation of the lake
Continuous through truss bridge over Little Red River (Greers Ferry Lake) on AR 16 between Higden and Greers Ferry
Open to traffic

Natural Dam Bridge (Crawford County, Arkansas)
Built 1934 by contractor M.E. Gillioz, replacing an earlier truss bridge built in 1907 by the Illinois Steel Bridge Co.
Two-span through truss bridge over Lee Creek on AR 59 near the community of Natural Dam
Open to traffic

Navajo Bridge (Coconino County, Arizona)
Built 1927-1929; bypassed by parallel bridge in 1995
Steel arch bridge over Colorado River on Alt US 89
Open to pedestrians only

Nebraska City Bridge (Otoe County, Nebraska)
Highway Bridge Built 1930 and Replaced 1983, Railroad bridge built 1887 and was abandoned
Lost through truss bridge over Missouri River/Bnsf Rr on Nebraska 2
Highway bridge replaced by new bridge

Neosho River K-58 Bridge (Neosho County, Kansas)
Built 1937
Through truss bridge over Neosho River on K-58
Open to traffic

Neosho River US 75 Bridge (Coffey County, Kansas)
Built 1934; Lost 2006
Through truss bridge over Neosho River on US 75
Lost

New Bluff Hall Bridge (Adams County, Illinois)
Built 1941
Tee beam bridge over Harkness Creek on IL 57 at Bluff Hall
Open to two-lane traffic

New Canal Bridge (Madison County, Illinois)
Built ca. 1963; IDOT has plans for bridge replacement in next 5 years
Pair of cantilevered through truss bridges over Chain of Rocks Canal on I-270 in Granite City
Open to traffic

New Chain of Rocks Bridge (Madison County, Illinois)
Built 1966
Bridge over Mississippi River on I 270
Open to traffic

New Franklin Viaduct (Howard County, Missouri)
Built 1940
Massive concrete deck girder bridge over Katy Trail and city streets on MO 5 in New Franklin
Open to traffic

New Harmony Bridge (Posey County, Indiana)
Built 1932
Closed four-span through truss toll bridge over Wabash River on IL 14 at New Harmony, Indiana
Open to toll traffic

New Portland Wire Bridge (Somerset County, Maine)
Built ca. 1866; rehabilitated 1961
Suspension bridge over Carrabasset River on Wire Bridge Road in New Portland
Open to traffic

New River Gorge Bridge (Fayette County, West Virginia)
Opened Oct. 22, 1977
Massive steel arch bridge over New River on US 19
Open to traffic

New Steubenville Bridge (Jefferson County, Ohio)
Built 1990
Cable-stayed bridge over the Ohio River on US 22 between Steubenville and Weirton in Steubenville
Open to traffic

Newman Bridge (Henry County, Missouri)
Built 1917; replaced 1998
Lost concrete girder bridge over West Fork of Tebo Creek on CR NE 500
Replaced by a new bridge

Newport Bridge (Jackson County, Arkansas)
Built 1930
Cantilevered through truss bridge on AR 367 (formerly US 67) over White River at Newport
Open to two-lane traffic

Niangua Arm US 54 Bridge (Camden County, Missouri)
Built 1930; replaced 1999
Lost cantilevered through truss bridge over Niangua Arm, Lake of the Ozarks, on US 54 southwest of Camdenton
Replaced by a new bridge

Niangua Bridge (Camden County, Missouri)
Built 1935; demolished in 2003
Lost deck truss bridge over Niangua Arm, Lake of the Ozarks, on MO 5/7 northwest of Camdenton
Replaced by modern bridge

Niangua River MO 64 Bridge (Dallas County, Missouri)
Built 1931
Two-span open-spandrel arch bridge over Niangua River on MO 64 near Bennett Springs
Open to traffic

Niangua River Old US 66 Bridge (Webster County, Missouri)
Built 1924
Pony truss bridge on Route CC (Old US 66) over East Fork Niangua River
Open to traffic

Niangua River Route K Bridge (Dallas County, Missouri)
Built or relocated here in 1936; rehabilitated 1994
Through truss bridge over Niangua River on Route K
Open to traffic