Little River Bridge (McCurtain County, Oklahoma)
Built 1938
Through truss bridge over Little River on US 70
Open to traffic

Little Robinson Road Bridge (Benton County, Arkansas)
Built ca. 1930
Pony truss bridge over an unnamed creek on Robinson Road (CR 103)
Open to one-lane traffic

Little Salt Creek Bridge (Lawrence County, Indiana)
Built 1897; rehabilitated 1987
Through truss bridge over Little Salt Creek on CR 595 East
Open to traffic

Little Sni-A-Bar Creek Bridge (Lafayette County, Missouri)
Built 1925
Pony truss bridge over Little Sni-A-Bar on MO 224 (Old US 24)
Open to one-lane traffic

Little Sugar Creek Bridge (Benton County, Arkansas)
Replaced 1940
Lost through truss bridge over Little Sugar Creek on AR 100 (later US 71) north of Bentonville in Bella Vista
Replaced by a new bridge

Little Valley Church Bridge (Bollinger County, Missouri)
Built 1922
Pony truss bridge over Cane Creek on CR 524 northwest of Dongola
Open to traffic on a gravel road with an 8 ton (?) weight limit

Little Wabash River Bridge (Edwards County, Illinois)
Built 1893
Through truss bridge over Little Wabash River on TR 229, 6.5 mi. west of Grayville
Open to traffic

Little Wabash River Bridge (Edwards County, Illinois)
Built 1940
Through truss bridge over Little Wabash River on FAS 800, 0.5 mi. south of Blood
Open to traffic

Little Zion Bridge (Madison County, Missouri)
Built 1922
Pony truss bridge over a branch of Twelvemile Creek near Zion on CR 417 (Old US 67)
Open to traffic with a 20 ton limit on a paved road

Livermore Bridge (Humboldt County, Iowa)
Replaced 2000
Lost through truss bridge over East Fork Des Moines River on 120th Street east of Livermore
Replaced by a new bridge

Lobatos Bridge (Conejos County, Colorado)
Built 1989
Pony truss bridge over Rio San Antonio on CR G east of Antonito
Open to two-lane traffic

Lock Springs Bridge (Daviess County, Missouri)
Built 1927 by Chillicothe Iron Co.; replaced 1990
Lost through truss over Grand River on CR 127 (Topper Road) west of Lock Springs
Replaced by a concrete bridge

Locust Creek Covered Bridge (Linn County, Missouri)
Built 1868 by Bishop and Eaton
Covered bridge over the old channel of Locust Creek between Laclede and Meadville off US 36
Open to pedestrians only

Locust Creek Route B Bridge (Linn County, Missouri)
Built or relocated here in 1938
Through truss bridge over Locust Creek on Route B, west of Linneus
Open to two-lane traffic

Log Creek MO 13 Bridge (Caldwell County, Missouri)
Built 1930; rehabilitated 1940
Through truss bridge over Log Creek on MO 13 in Kingston
Open to traffic

Log Creek Road Bridge (Caldwell County, Missouri)
Built 1908
Pony truss bridge over Log Creek on S.W. Log Creek Road
Open to traffic

Log Lick Creek Bridge (Switzerland County, Indiana)
Built 1882
Through truss bridge over Log Lick Creek on Dead End Road
Closed to all traffic

Logan Creek Katy Bridge (Callaway County, Missouri)
Pony truss bridge over Logan Creek on the Katy Trail (former MKT Railroad)
Open to pedestrians and bicyclists only

Logan Creek Old US 160 Bridge (Ripley County, Missouri)
Built 1923; made obsolete by new US 160 alignment in 1974
Pony truss bridge over Logan Creek on CR 160E-12 (Old US 160), northeast of Doniphan
Open to traffic on a paved road

Logan Mills Covered Bridge (Clinton County, Pennsylvania)
Built 1874
Covered bridge over Fishing Creek on Logan Mills Road
Open to traffic

Long Creek Bridge (Taney County, Missouri)
Built 1956
Cantilevered through truss bridge on MO 86 over Long Creek (Table Rock Lake)
Open to two-lane traffic

Long Shoals Bridge (Bourbon County, Kansas)
Built 1902 by the Midland Bridge Co.
Abandoned through truss bridge over Little Osage River, 5.0 mi. east and 1.0 mi. south of Fulton
Closed to all traffic

Longman Road Bridge (Preble County, Ohio)
Built ca. 1875
Pony truss bridge over Sugar Creek on Longman Road (TR 255)
Open to traffic

Los Cerritos Bridge (Conejos County, Colorado)
Reconstructed 1987
Pony truss bridge over Conejos River on CR M south of Manassa
Open to one-lane traffic

Lost Creek Bridge (Bourbon County, Kansas)
Built 1888
Through truss bridge over Lost Creek, 3.0 mi. east and 0.3 mi. north of Mapleton
Closed to all traffic

Lost River Bridge (Orange County, Indiana)
Built ca. 1920; rehabilitated 1992
Pony truss bridge over Lost River on CR 500 East
Open to traffic

Lost River Bridge (Orange County, Indiana)
Through truss bridge over Lost River on CR 520 West
Open to traffic

Louisiana Railroad Bridge (Pike County, Missouri)
Built 1872-73
Through truss swing railroad bridge over the Mississippi River at Louisiana
Open to train traffic

Loutre River Katy Trail Bridge (Montgomery County, Missouri)
Built 1897 by the A&P Roberts Co. of Pencoyd, Pennsylvania
Through truss bridge over Loutre River on the Katy Trail (former MKT Railroad), just west of McKittrick
Open to pedestrians only

Lower Elgin Road Bridge (Bastrop County, Texas)
Built 1910
Through truss bridge over Wilbarger Creek on Lower Elgin Road
Open to pedestrians only

Lowndes Bridge (Wayne County, Missouri)
Built ca. 1920; closed to all traffic 2008
Through truss bridge over Bear Creek located at the Iron Bridge Conservation Area
Closed to all traffic

LSF Railroad Bridge (Linn County, Kansas)
Built 1989
Deck truss bridge over Local Road. 22 on LSF Railroad, 1.8 mi. north and 2.0 mi. west of Trading Post
Open to traffic

Lupus Bridge (Moniteau County, Missouri)
Built 1894 by the Kansas City Bridge & Iron Co.; replaced 1995
Through truss bridge formerly over Splice Creek on Ridge Road (CR 4) near Lupus
Relocated to private property next to creek

Lusk Creek Bridge (Pope County, Illinois)
Built 1934
Through truss bridge over Lusk Creek on Eddyville Road (FAS 930), southeast of Eddyville, 3.25 mi. southeast of Eddyville
Open to two-lane traffic

MacArthur Bridge (St. Louis, Missouri)
Built 1907-1917 by the City of St. Louis to break the monopoly of the Terminal Railroad Association, which controlled the two other bridges at St. Louis and charged unreasonable tolls.
Three-span through truss bridge over the Mississippi River in St. Louis, south of the Poplar Street Bridge
Open to railroad traffic only

Mace Creek Bridge (Andrew County, Missouri)
Built ca. 1925
Through truss bridge over Mace Creek on CR 392
Open to traffic

Macoupin Bridge (Macoupin County, Illinois)
Pony truss bridge over Macoupin Creek on Lake Catatoga Road south of Macoupin
Open to one-lane traffic

Madison Bridge (St. Francis County, Arkansas)
Built 1933 by the Wisconsin Bridge & Iron Co. of Milwaukee
Through truss bridge with center swing span over St. Francis River on US 70 near Madison
Open to traffic

Madison-Milton Bridge (Jefferson County, Indiana)
Built 1928-29; rehabilitated 1997
Cantilevered through truss bridge over Ohio River on US 421 between Madison, IN, and Milton, KY
Open to traffic

Magazine Middle Bridge (Logan County, Arkansas)
Made obsolete by new bridge in 1982
Closed through truss bridge over Petit Jean River on Old AR 109 south of Magazine
Bypassed by modern bridge

Magazine Third Bridge (Logan County, Arkansas)
Built 1938 by the Vincennes Bridge Co.; closed to traffic ca. 1998
Through truss bridge over Petit Jean River on Old AR 109 (CR 277) south of Magazine
Closed to all traffic

Main Ditch Old US 60 Bridge (Stoddard County, Missouri)
Built 1922, rehabilitated 1932
Pony truss bridge over a tributary of Main Ditch on MO 114 (Old US 60) east of Dexter
Open to one-lane traffic

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

Mammoth Spring Bridge (Fulton County, Arkansas)
Lost six-span pony truss bridge over the outlet of Mammoth Spring
No longer exists

Mansfield Covered Bridge (Parke County, Indiana)
Built 1867 by J.J. Daniels; rehabilitated 1990
Covered bridge over Big Raccoon Creek on CR 620 South
Open to 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

Maple Road Bridge (Minnehaha County, South Dakota)
Through truss bridge over Big Sioux River on former Maple Road in Sioux Falls
Open to pedestrians only

Marais des Cygnes River Bridge (Franklin County, Kansas)
Warren through truss bridge over Marais des Cygnes River on Abandoned Railroad Grade - formerly Missouri Pacific Railroad.
Closed to all traffic

Marais des Cygnes River Bridge (Franklin County, Kansas)
Parker through truss bridge over Marais des Cygnes River on Burlington Northern Santa Fe Railroad
Open to traffic

Marais des Cygnes River Bridge (Osage County, Kansas)
Pratt through truss bridge over Marais des Cygnes River on Burlington Northern Santa Fe Railroad
Open to traffic

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

Marias Des Cygnes River Bridge (Miami County, Kansas)
Built ca. 1920
Through truss bridge over Marias Des Cygnes River on 347th Street, 1.3 mi. east of Osawatomie
Open to traffic

Maries River CR 608 Bridge (Osage County, Missouri)
Built ca. 1915
Twin through truss bridge over Maries River on CR 608 northeast of Westphalia
Open to traffic with a 7 ton weight limit

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 Road Bridge (Fayette County, Ohio)
Built 1883 by the Wrought Iron Bridge Co.; reconstructed 2007
Through truss bridge over Sugar Creek on Mark Road
Open to 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

Marquand Bridge (Madison County, Missouri)
Old bridge built 1924 at a cost of about $4,000, raised by the community. Replaced 1993.
Lost through truss bridge over Castor River on Route A at Marquand
Replaced by concrete span; portion of old bridge now rests in Marquand City Park

Marshall Covered Bridge (Parke County, Indiana)
Built 1917 by J.A. Britton
Covered bridge over Rush Creek on CR W800N
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 Bridge (Lake County, Colorado)
Pony truss on a bike trail east of Leadville crossing CR 3
Open to two-lane bike traffic above and road traffic below

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

Martintown Road Bridge (Union County, Mississippi)
Built 1968
Pony truss bridge over Tallahatchie River on CR 86 (Martintown Road) in New Albany
Open to traffic

Mary's River Covered Bridge (Randolph County, Illinois)
Built 1854; carried traffic until 1930; rehabilitated 1954 and 2004-05
Covered bridge over Little Mary's River northeast of Chester, just off IL 150
Open to pedestrians only

Maryland Street Bridge (Pike County, Missouri)
Built ca. 1920
Pony truss bridge over Town Branch on Maryland Street in Louisiana
Open to one-lane traffic with an 8 ton weight limit

Marys River Railroad Bridge (Randolph County, Illinois)
Through truss bridge over Marys River on the Union Pacific Railroad, south of Chester and just west of IL 3
Open to railroad traffic

Mason Bridge (Texas County, Missouri)
Built 1926
Closed through truss bridge over Big Piney River on Mason Road (Old MO 32) west of Licking
Closed to all traffic

Massie Creek Katy Trail Bridge (Warren County, Missouri)
Pony truss bridge over Massie Creek on the Katy Trail just off MO 94
Open to pedestrians and bicyclists only

Matheson Railroad Bridge (Elbert County, Colorado)
Originally built 1883 by the American Bridge Co. as an eight-span bridge at Colona, Illinois, over the Rock River. Two spans relocated here in 1920 to replace an 1899 trestle. Rails removed in 1992.
Abandoned two-span through truss bridge over Big Sandy Creek on the Rock Island Railroad east of Matheson
Railroad line discontinued with tracks removed

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

McAlister Covered Bridge (Parke County, Indiana)
Built 1914 by J.A. Britton; rehabilitated 1977
Covered bridge over Little Raccoon Creek on CR E400S
Open to traffic

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

McColly Covered Bridge (Logan County, Ohio)
Built 1876 by the Anderson Green Co.; rehabilitated 2000
Three-span covered bridge over Great Miami River on CR 13
Open to traffic

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

McGilvray Road Bridge No. 1 (La Crosse County, Wisconsin)
Built 1906 by the the La Crosse Bridge & Steel Co.
Two-span bowstring truss bridge over a tributary of Black River on Old McGilvray Road in Van Loon Wildlife Area
Open to pedestrians only

McGilvray Road Bridge No. 2 (La Crosse County, Wisconsin)
Built 1908 by the the La Crosse Bridge & Steel Co.
Two-span bowstring truss bridge over a tributary of Black River on Old McGilvray Road in Van Loon Wildlife Area
Open to pedestrians only

McGilvray Road Bridge No. 3 (La Crosse County, Wisconsin)
Built 1905 by the the La Crosse Bridge & Steel Co.
Bowstring truss bridge over a tributary of Black River on Old McGilvray Road in Van Loon Wildlife Area
Open to pedestrians only

McGilvray Road Bridge No. 4 (La Crosse County, Wisconsin)
Built 1907 by the the La Crosse Bridge & Steel Co.
Two-span bowstring truss bridge over a tributary of Black River on Old McGilvray Road in Van Loon Wildlife Area
Open to pedestrians only

McGilvray Road Bridge No. 6 (La Crosse County, Wisconsin)
Built 1905 by the the La Crosse Bridge & Steel Co.
Bowstring truss bridge over a tributary of Black River on Old McGilvray Road in Van Loon Wildlife Area
Open to pedestrians only

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

McIlroy Road Bridge (Randolph County, Arkansas)
Built 1963
Lost pony truss bridge over an unnamed creek on McIlroy Road
No longer exists

McKenzie Creek Iron Bridge (Wayne County, Missouri)
Warren pony truss bridge over McKenzie Creek on Missouri Pacific Railroad
Open to traffic

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

McKinley Bridge (St. Louis, Missouri)
Dedicated Nov. 10, 1910; closed to traffic in Oct. 2001; reopened 2007
Three-span through truss bridge over the Mississippi River between St. Louis and Venice, Illinois
Open to traffic

McKinney Creek Bridge (Polk County, Arkansas)
Built 1915
Pony truss bridge over McKinney Creek on CR 50
Open to one-lane traffic

McLain Covered Bridge (Licking County, Ohio)
Built 1871
Relocated covered bridge at Firemans Park in Alexandria
Open to pedestrians only

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

McNeely Creek Bridge (Clark County, Arkansas)
Built 1923; rehabilitated 1990
Pony truss bridge over McNeely Creek on CR 12
Open to one-lane traffic

Meadowland Street Bridge (Minnehaha County, South Dakota)
Pratt through truss bridge over Big Sioux River on Meadowland Street (now private), 5 miles south of Baltic
Closed to all traffic

Mecca Covered Bridge (Parke County, Indiana)
Built 1873 by J.J. Daniels; closed to traffic 1964; rehabilitated 1993
Covered bridge over Big Raccoon Creek on CR 136, northeast of Mecca
Open to pedestrians only

Mechanicsville Covered Bridge (Ashtabula County, Ohio)
Built 1867; rehabilitated 2003
Covered bridge over Grand River on Windsor-Mechanicsville Road
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

Melcher Covered Bridge (Parke County, Indiana)
Built 1896 by J.J. Daniels; rehabilitated 1977 and 1995
Covered bridge over Leatherwood Creek on CR W20N
Open to traffic

Memorial Park Covered Bridge (Auglaize County, Ohio)
Built 1992
Modern covered bridge over St. Mary's River in Memorial Park at St. Mary's
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

Mengo Bridge (Butler County, Missouri)
Built 1906 by the American Bridge Co.
Two-span through truss bridge over Black River on the Union Pacific Railroad, between Poplar Bluff and Hilliard
Still in use

Menomonee River Bridge (Milwaukee County, Wisconsin)
Built 1976
Pony truss bridge over Menomonee River on N. 50th Street in Milwaukee
This bridge does not exist

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

Merchants Bridge (St. Louis, Missouri)
Completed May 1890
Three-span through truss railroad bridge over the Mississippi River between St. Louis and Venice, Illinois
Open to railroad traffic only

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