Merriam Street Bridge (Hennepin County, Minnesota)
Originally built 1887 by the King Iron Bridge Co. as a four-span truss bridge on Broadway Street; one span relocated here in 1987
Relocated through truss bridge over the Mississippi River (East Channel) on Merriam Street at Nicollet Island in Minneapolis
Open to traffic

Merrick Ford Bridge (Jasper County, Missouri)
Built 1891 by the Missouri Valley Bridge & Iron Co.; replaced 1996
Lost through truss bridge over Spring River on Kafir Road (CR 321)
Replaced by a new bridge

Michigan Avenue Bridge (Cook County, Illinois)
Built 1920
Bascule bridge over Main Branch Chicago River on Michigan Avenue in Chicago
Open to traffic

Middle Creek Bridge (Miami County, Kansas)
Built 1907
Through truss bridge over Middle Creek on 379th Street, 1.5 mi. south and 1.8 mi. west of New Lancaster
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 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

Midland Fredericktown Road Bridge (Columbiana County, Ohio)
Built 1900; rehabilitated 2004
Through truss bridge over North Fork Little Beaver Creek on Midland Fredericktown Road (TR 1038) in Calcutta
Open to traffic

Mill Creek Bridge (Wabaunsee County, Kansas)
Built ca. 1935
Through truss bridge over Mill Creek on Willard Road, 1.0 mi. east and 0.2 mi. north of Maple Hill
Open to traffic

Mill Hill Road Bridge (Franklin County, Missouri)
Bypassed by new bridge in 1993
Through truss bridge over Meramec River on Mill Hill Road south of Moselle
Closed 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

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

Miner Street Bridge (Clear Creek County, Colorado)
Built 1902 by Kuyes and Work. Reconstructed 1990 (the trusses are no longer load-bearing).
Reconstructed pony truss bridge over Clear Creek on Miner Street in Idaho Springs
Open to traffic

Mississippi County Road 307 Bridge (Mississippi County, Missouri)
Built 1921
Pony truss on CR 307 (Old US 60) near Birds Point over a drainage ditch emptying into Brewer Lake in Wyatt
Open to traffic on a paved road with a 20 ton weight limit

Missouri Street Bridge (Washington County, Missouri)
Pony truss bridge over Breton Creek on Missouri Street in Potosi, just south of the courthouse
Open to traffic

Mollys Run Bridge (Jefferson County, Indiana)
Built 1905
Pony truss bridge over Mollys Run on Brooksburg Manville Road (CR 260N)
Open to one-lane traffic

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

Moniteau Church Road Bridge (Moniteau County, Missouri)
Built ca. 1930
Pony truss bridge over Howard Creek on Moniteau Church Road southwest of Jamestown
Open to traffic

Moniteau Creek Road Bridge (Cole County, Missouri)
Built 1915; made obsolete by a new bridge on MO 179 in 1967
Through truss bridge over Moniteau Creek on Moniteau Creek Road (Old MO 179)
Open to traffic

Monkey Jack Bridge (Henry County, Indiana)
Built in 1910, closed in 1970's
Pony truss bridge over Big Blue River on CR 225 West
Closed to all traffic with deck missing

Monroe Street Bridge (Cook County, Illinois)
Built 1919
Bascule bridge over South Branch Chicago River on W. Monroe Street in Chicago
Open to traffic

Monument Road Bridge (Harris County, Georgia)
Built 1930
Truss bridge over Sand Creek on Monument Road
Open to traffic

Morse Mill Bridge (Jefferson County, Missouri)
Built ca. 1886 by the St. Louis Bridge & Iron Co. Made obsolete by a new bridge on Route B in 1962.
Closed through truss bridge over Big River at Morse Mill
Open to pedestrians only

Morton Bridge (Ray County, Missouri)
Built by the Wrought Iron Bridge Co.
Through truss bridge over Crooked River on Landing Road
Open to traffic

Moss Road Bridge (Blount County, Alabama)
Built 1940
Through truss bridge over Calvert Prong Little War on Moss Road
Open to traffic

Mountain Fork Bridge (Polk County, Arkansas)
Built 1905
Two-span pony truss bridge over Mountain Fork Creek on CR 38 near the community of Camp Pioneer
Open to traffic

Mountain Glen Bridge (Union County, Illinois)
Pony truss bridge over a branch of Clear Creek near Mountain Glen
Open to traffic on a paved road

Muddy Creek Old US 65 Bridge (Pettis County, Missouri)
Built ca. 1930
Through truss bridge over Muddy Creek on Claycomb Road (Old US 65) north of Sedalia
Open to traffic

Mulberry Bridge (Crawford County, Arkansas)
Derelict through truss bridge over Mulberry River near Mulberry
Derelict

Munger Bridge (Adams County, Illinois)
Through truss bridge temporarily sitting next to 1000th Street, just north of the Pike County line
Sitting abandoned, propped up on wheels and concrete blocks

Murphy Drive Bridge (Caldwell County, Missouri)
Built ca. 1930
Pony truss bridge over Long Creek on S.W. Murphy Drive
Open to traffic

Murray Bridge (Humboldt County, Iowa)
Built 1905 by A.H. Austin; rehabilitated 1982; damaged in car wreck during 2004
Through truss bridge over West Fork Des Moines River on 190th Street, southeast of Bradgate
Closed to traffic

Murtaugh Bridge (Twin Falls County, Idaho)
Built 1915-16 by Charles H. Mull; replaced 1983
Lost Pratt deck truss bridge over Snake River on FAS 2744
Replaced by new bridge

Mystery Bridge (Harrison County, Missouri)
Through truss bridge somewhere near Bethany
Unknown status

Mystery Bridge (Boone County, Missouri)
Lost through truss bridge somewhere near Easley, possibly over Perche Creek
No longer exists

Mystery Bridge (Faulkner County, Arkansas)
Lost through truss bridge somewhere in Faulkner County
No longer exists

Mystery Bridge (Washington County, Arkansas)
Lost through truss bridge somewhere in Washington County, possibly over White River
No longer exists

Mystery Bridge (Crawford County, Arkansas)
Lost two-span through truss bridge, possibly over Mulberry River
No longer exists

Neosho River Bridge (Lyon County, Kansas)
Built ca. 1930; replaced 2001
Lost through truss bridge over Neosho River, 4.0 mi. east of Emporia
No longer exists

Neosho River Bridge (Neosho County, Kansas)
Built 1928
Through truss bridge over Neosho River, 1.2 mi. south and 0.4 mi. west of Erie
Open to traffic

Neosho River Bridge (Labette County, Kansas)
Pratt through truss bridge over Neosho River
Open to authorized vehicles only

Neosho River Bridge (Neosho County, Kansas)
Through truss bridge over Neosho River on 42.5-17.6 Local, 1.0 mi. east and 2.6 mi. south of St. Paul
Open to traffic

Nepesta Bridge (Pueblo County, Colorado)
Built 1905-06 by the Pueblo Bridge Co.; replaced 1989
Lost two-span through truss bridge over Arkansas River on Nepesta Road (CR 613) southeast of Boone
Replaced by a new bridge

New Hope Bridge (Bartholomew County, Indiana)
Built 1913; rehabilitated 1999
Two-span through truss bridge over Flatrock River on CR 400 North in Columbus
Open to traffic

New Lick Log Creek Bridge (Bollinger County, Missouri)
Originally built ca. 1922 on a state highway. Relocated here in 1995 to replace the older Lick Log Creek Bridge (now derelict)
Refurbished pony truss bridge over Lick Log Creek on CR 736 near Gipsy
Open to traffic with no posted restrictions

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

Nineteenth Street Bridge (Denver County, Colorado)
Built 1888 by the Missouri Valley Bridge & Iron Works; rehabilitated 1965; closed to traffic 1986; new bridge built 1992
Two-span wrought-iron through truss bridge over South Platte River on 19th Street in Denver
Open to pedestrians only

Nineveh Bridge (Adair County, Missouri)
Built 1885; replaced 1989
Lost through truss bridge over Old Channel Chariton River on CR 175 east of Connelsville
Replaced by a concrete bridge

Ninnescah River Bridge (Sumner County, Kansas)
Built 1962
Through truss bridge over Ninnescah River, 2.0 mi. east and 3.8 mi. south of Belle Plaine
Open to traffic

Noakes Bridge (Nodaway County, Missouri)
Built 1891-92 by the St. Joseph Bridge & Iron Co.; replaced 1991
Lost through truss over One Hundred and Two River on 130th Street (CR 156) southwest of Hopkins
Replaced by a concrete bridge

North Avenue Bridge (Cook County, Illinois)
Built 1907
Double-leaf bascule through truss bridge over North Branch Chicago River on North Avenue in Chicago
Open to two-lane traffic

North Big River Bridge (St. Francois County, Missouri)
Built 1924; made obsolete by new bridge in 1956
Through truss bridge over Big River on Old US 67 (Berry Road) north of Bonne Terre
Closed to traffic

North Boat Ditch Bridge (Clark County, Arkansas)
Built ca. 1928
Through truss bridge over North Boat Ditch on CR 8
Open to one-lane traffic

North Cut Ditch Bridge (Scott County, Missouri)
Built 1923; rehabilitated 1941
Through truss bridge on MO 77 over North Cut Ditch northwest of Diehlstadt
Open to one-lane traffic

North Fork MO 126 Bridge (Barton County, Missouri)
Built 1954
Three-span pony truss bridge over North Fork Spring River on MO 126
Open to two-lane traffic

North Fork Route M Bridge (Jasper County, Missouri)
Built 1949
Pony truss bridge over North Fork Spring River on Route M (Baseline Road) in Carytown
Open to two-lane traffic

North Halsted Street Bridge (Cook County, Illinois)
Built 1909
Bascule bridge over North Branch Chicago River Canal on N. Halsted Street in Chicago
Open to traffic

North Railroad Street Bridge (Rush County, Indiana)
Built 1901 by the New Castle Bridge Co.
Through truss bridge over Little Flatrock River on North Railroad Street
Closed to all traffic

North River Bridge (Marion County, Missouri)
Lost through truss bridge over North River somewhere near Palmyra
No longer exists

North River MO 168 Bridge (Marion County, Missouri)
Built 1932
Four-span through truss bridge over North River on MO 168, west of Palmyra
Open to two-lane traffic

Northern Pacific Railroad Bridge (Hennepin County, Minnesota)
Built 1895
Pratt deck truss bridge over Mississippi River on Northern Pacific Railroad (now pedestrian trail) in Minneapolis
Open to pedestrians

Oak Dale Road Bridge (Moniteau County, Missouri)
Built ca. 1930
Through truss bridge over Straight Fork on Oak Dale Road northwest of Latham
Open to one-lane traffic with a 15 ton weight limit

Okabena Bridge (Jackson County, Minnesota)
Built 1936; replaced 1998
Lost through truss bridge over Jack Creek on CSAH 9 at Okabena
Replaced by a modern bridge

Okamanpedan State Park Bridge (Emmet County, Iowa)
Built 1914; rehabilitated 1923
Pony truss bridge over East Fork Des Moines River on Tuttle Lake Road at Okamanpedan State Park
Open to one-lane traffic

Old Alton Bridge (Denton County, Texas)
Built 1884 by the King Bridge Co.; later bypassed
Through truss bridge over Hickory Creek on Copper Canyon Road in Denton
Open to pedestrians only

Old Alton Road Bridge (Oregon County, Missouri)
Through truss bridge over Warm Fork Spring River on the old Thayer-Alton Road near Thayer
Closed to all traffic

Old Appleton Bridge (Cape Girardeau County, Missouri)
Built 1879 by H.W. Sebastian & Co. of St. Louis; washed away by flash flood on December 3, 1982; reconstructed 2005
Wrought-iron through truss bridge over Apple Creek on Main Street in Old Appleton
Open to pedestrians and bicyclists only

Old Barn Bridge (Fillmore County, Minnesota)
Built 1914
Through truss bridge over Mill Pond South Branch Root on Heron Rd.
Open to traffic

Old Grade Road Bridge (Adair County, Missouri)
Built 1924; replaced 1989
Lost skewed through truss bridge over North Fork Salt River (Brashear Ditch) on CR 285 (Old Grade Road) south of Brashear
Replaced by a concrete bridge

Old Katy Bridge (Geary County, Kansas)
Built 1913 by the Pencoyd Bridge & Construction Co.
Through truss bridge over Lyon Creek on Otter Creek Road, just southeast of Wreford
Open to traffic

Old Mines Bridge (Washington County, Missouri)
Built 1923; rehabilitated 1933; replaced Summer 2007
Lost pony truss bridge over Old Mines Creek on MO 21
Replaced by a new bridge

Old Monroe Bridge (Lincoln County, Missouri)
Built 1930
Three-span through truss bridge over Cuivre River on Main Street (Old MO 79) in Old Monroe
Closed to all traffic as of March 2008

Old Monroe Railroad Bridge (Lincoln County, Missouri)
Three-span through truss bridge over Cuivre River on the BNSF Railroad at Old Monroe
Open to railroad traffic

Old Monticello Road Bridge (Bradley County, Arkansas)
Lost swing through truss bridge over Saline River on AR 4 (now US 278) between Warren and Monticello
Replaced 1949 by a new bridge located upstream

Old River Bridge (Saline County, Arkansas)
Built 1899 by the Youngstown Bridge Co. of Youngstown, Ohio; closed to traffic in 1974
Two-span through truss bridge over Saline River on the Old Military Road near Benton
Abandoned with portions of deck missing

Old State Road Bridge (Clinton County, Illinois)
Built ca. 1930
Pony truss bridge over Beaver Creek on Old State Road (TR 109)
Open to one-lane traffic with a 6 ton weight limit

Orange Road Bridge (Delaware County, Ohio)
Built 1898 by the Toledo Bridge Co.; rehabilitated 1970
Through truss bridge over Olentangy River on Orange Road (TR 114) in Powell
Open to one-lane traffic

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

Organ Ferry Bridge (Ralls County, Missouri)
Lost through truss bridge near New London
No longer exists

Orr Road Bridge (Washington County, Arkansas)
Built 1924
Through truss bridge over Illinois River on Orr Road (CR 67) just off AR 265, southeast of Prairie Grove
Open to one-lane traffic

Osage City Railroad Bridge (Cole County, Missouri)
Through truss bridge on the Union Pacific Railroad over Osage River at Osage City
Still in use

Osage Creek Bridge (Benton County, Arkansas)
Built 1911 by the Youngstown Bridge Co. of Youngstown, Ohio
Through truss bridge over Osage Creek on CR 71 southeast of Healing Springs
Open to one-lane traffic

Osage Valley Road Bridge (Cooper County, Missouri)
Built 1913; rehabilitated 1993
Pony truss bridge over Petite Saline Creek on Osage Valley Road
Open to traffic

Osceola Bridge (St. Clair County, Missouri)
Lost two-span through truss bridge over Osage River at Osceola
Demolished with the creation of Truman Reservoir

Osiris Bridge (Cedar County, Missouri)
Built ca. 1910; replaced 2006
Lost pony truss bridge over Horse Creek on CR 1600
Replaced by a new bridge

Ottawa Street Bridge (Newton County, Missouri)
Built by the Canton Bridge Co.
Pony truss bridge over Little Lost Creek on Ottawa Street in Seneca
Open to traffic

Ouachita River CR 74 Bridge (Polk County, Arkansas)
Built 1914; replaced 2001
Lost pony truss bridge over Ouachita River on CR 74
Replaced by a new bridge

Ouachita River CR 76 Bridge (Polk County, Arkansas)
Built 1914
Pony truss bridge over Ouachita River on CR 76
Open to one-lane traffic

Owens Mill Bridge (Cedar County, Missouri)
Built ca. 1910 by the Canton Bridge Co.
Through truss bridge over Bear Creek on CR 1801
Open to one-lane traffic

Palisades Bridge (Minnehaha County, South Dakota)
Built 1881 by S.M. Hewitt & Co.
Through truss bridge over Split Rock Creek on 485th Avenue at Palisades State Park
Open to one-lane traffic

Papinville Bridge (Bates County, Missouri)
Built 1884 by the Kansas City Bridge & Iron Co.; bypassed by new bridge in 1995
Closed through truss bridge over Marais des Cygnes River just west of Papinville
Closed to all traffic

Paradise Road Bridge (Clay County, Missouri)
Built 1896 by the Missouri Valley Bridge & Iron Works of St. Louis; demolished 1979 with the creation of Smithville Reservoir
Lost through truss over Little Platte River near Paradise
Removed

Paris Truss Bridge (Monroe County, Missouri)
Lost through truss bridge over Middle Fork Salt River on MO 15 (Old US 24) at Paris
Replaced by a modern bridge in 1985

Patoka River Bridge (Orange County, Indiana)
Built 1884
Through truss bridge over Patoka River on CR 850 South
Open to traffic

Pedro Bridge (Benton County, Arkansas)
Built 1922
Through truss bridge over Illinois River on CR 196 between US 412 and Old AR 68
Closed to traffic

Pennington Bayou Bridge (Pulaski County, Arkansas)
Built 1923; replaced 1997
Lost through truss bridge over Pennington Bayou on AR 365 (Old US 65) in Woodson
Replaced by a modern bridge

Penns Creek US 522 Bridge (Snyder County, Pennsylvania)
Built 1941
Two-span through truss bridge over Penns Creek on PA 522 in Selinsgrove
Open to traffic

Perry Highway Bridge (Mercer County, Pennsylvania)
Built 1928; rehabilitated 1975
Through truss bridge over Neshannock Creek on PA 19 (Perry Highway)
Open to traffic

Petersburg Road Bridge (Jackson County, Minnesota)
Built 1930; closed to traffic 1984; abandoned 1992; damaged by flooding 1993; later demolished
Lost through truss bridge over West Fork Des Moines River on Petersburg Road in Jackson
No longer exists