Mulladay Hollow Bridge (Carroll County, Arkansas)
Built ca. 1935 by the Civilian Conservation Corps
Small two-span stone arch bridge over Mulladay Hollow Creek on CR 204 at Leatherwood Lake Recreation Area northwest of Eureka Springs in Eureka Springs
Open to traffic

Mullen Covered Bridge (Ashtabula County, Ohio)
Built 1876; rehabilitated 1987-88
Covered bridge over Mill Creek on Doyle Road
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

Murphy Bridge (Huntington County, Indiana)
Built in 1928 by the Pan American Bridge Company; Restored in 2006.
Parker through truss bridge over Salamonie River on CR 800 South
Open to traffic

Murphy Drive Bridge (Caldwell County, Missouri)
Built ca. 1930
Pony truss bridge over Long Creek on S.W. Murphy Drive
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 Arch Bridge (Douglas County, Oregon)
Built 1922, Rehabilitation & Widening 2007
Concrete arch bridge over South Umpqua River on CR 386 in Myrtle Creek
Open to traffic

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

N. 45th Street Bridge (Milwaukee County, Wisconsin)
Built 1952
Pony plate girder bridge over Menomonee River on N 45th Street in Milwaukee
Open to traffic

N. East Street Bridge (Faribault County, Minnesota)
Built 2002 Previous span consisted of a Howe pony truss bridge built in 1910. Bridge was abandond for years and was subject to a huge debate beginning in 1998.
Stringer bridge over E Fork Blue Earth River on City St # 88 at 1st Street
Open to traffic

N. Emmber Lane Bridge (Milwaukee County, Wisconsin)
Built 2000
Bascule bridge over Menomonee River on N. Emmber Lane in Milwaukee
Open to traffic

N. Sunny Point Road Bridge (Milwaukee County, Wisconsin)
Built 1928
Deck truss bridge over N. Sunny Point Road on CNW RR in Glendale
Open to traffic

N. Teutonia Avenue Bridge (Milwaukee County, Wisconsin)
Built 1936; Reconstructed in 2002
Concrete arch bridge over Lincoln Creek on N. Teutonia Avenue in Milwaukee
Open to traffic

Nahma Bridge (Delta County, Michigan)
Built 1917 by the Joliet Bridge & Iron Co.; closed to traffic in 1995; relocated Summer 2006
Pony truss bridge formerly over Sturgeon River on CR 497
Relocated to a golf course

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

National Avenue Bridge (Bourbon County, Kansas)
Built 1933; rehabilitated 1983
Marsh arch bridge over Marmaton River on National Avenue (Old US 69) in Fort Scott
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

Neawanna Creek Bridge (Clatsop County, Oregon)
Built 1930
Concrete deck girder bridge over Neawanna Creek on U.S. 101 in Seaside
Open to traffic

Neff's Mill Covered Bridge (Lancaster County, Pennsylvania)
Built 1875
Covered bridge over Pequea Creek on Penn Grant Road
Open to traffic

Nehalem River Bridge (Clatsop County, Oregon)
Built 1939
Concrete arch bridge over Nehalem River on US 26
Open to traffic

Neosho River Bridge (Neosho County, Kansas)
Built 1954
Through truss bridge over Neosho River, 0.4 mi. west of Shaw
Open to traffic

Neosho River Bridge (Coffey County, Kansas)
Built 1926
Two-span Marsh arch bridge over Neosho River on 19th Road, 0.2 mi. east of Hartford
Open to traffic

Neosho River Bridge (Lyon County, Kansas)
Parker through truss bridge over Neosho River on Atchison, Topeka, and Santa Fe (ATSF) Railroad
Open to traffic

Neosho River Bridge (Lyon County, Kansas)
Built ca. 1940
Through truss bridge over Neosho River, 0.5 mi. west of Neosho Rapids
Open to traffic

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

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

Nevins Covered Bridge (Parke County, Indiana)
Built 1920 by J.A. Britton
Covered bridge over Little Raccoon Creek on CR S130E
Open to traffic

New Athens Railroad Bridge (St. Clair County, Illinois)
2 span Parker Through Truss
2 span Parker through truss bridge over Kaskaskia River on Illinois Central Railroad in New Athens
Open to railroad traffic

New Athens Railroad Viaduct (St. Clair County, Illinois)
Built 1928. Open to railroad traffic above and vehicle traffic below. Slated to be removed October 2008.
Deck plate girder bridge over IL 13 on I.C.& Gulf R.R. in New Athens
Open to traffic

New Blaine Bridge (Logan County, Arkansas)
Built 1929
Concrete tee beam bridge over Little Shoal Creek on AR 197
Open to traffic

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 Germantown Covered Bridge (Perry County, Pennsylvania)
Built 1891
Covered bridge over Shermans Creek on TR 302
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 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

New Madrid County Road 626 Bridge (New Madrid County, Missouri)
Built 1954; rehabilitated 1986
Wooden deck bridge over Otter Slough Ditch on CR 626 southwest of Matthews
Open to one-lane traffic with a 13 ton weight limit

New Madrid County Road 630 Bridge (New Madrid County, Missouri)
Built 1966; rehabilitated 1995
Wooden deck bridge over Ash Slough Ditch on CR 630 at Route AE
Open to one-lane traffic

New Pakota River Bridge (Gibson County, Indiana)
Built 1915
Through truss bridge over New Pakota River on CR 550 East
Open to 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 Rothrock Mill Bridge (Crawford County, Indiana)
Built 2005; replaced the old Rothrock Mill Bridge
Warren pony truss bridge over Blue River on Rothrock Mill Road (Co. Rd 120 South)
Open to traffic

New Steelbridge Rd. Bridge (Dawson County, Georgia)
Built 1980
Bridge over Amicalola Creek on Steelbridge Rd.
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

Newell Toll Bridge (Hancock County, West Virginia)
Built 1905; rehabilitated 1954
Private suspension bridge over the Ohio River on Golding Street Extension between Newell and East Liverpool
Open to toll traffic

Newman Road Bridge (Gibson County, Indiana)
Built 1927
Pony truss bridge over Newman Lateral on Newman Road
Open to traffic

Newport Bridge (Newport County, Rhode Island)
Built 1969
Suspension bridge over East Passage Narragansett Bay on RI 138 in Newport
Open to toll traffic

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

Newport Covered Bridge (Vermillion County, Indiana)
Built 1885 by J.J. Daniels; rehabilitated 1983
Covered bridge over Little Vermillion River on CR 50 North
Open to traffic

Newport Railroad Bridge (Jackson County, Arkansas)
Built 1938 by the Virginia Bridge Co.
Through truss swing bridge over White River and CR 10 on the Union Pacific Railroad south of Newport
Open to railroad traffic

Newport Road Bridge (Franklin County, Missouri)
Small concrete arch bridge over a branch of Little Boeuf Creek on Newport Road just off MO 100
Open to one-lane traffic

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

Nichols Street Bridge (Callaway County, Missouri)
Built ca. 1940
Wooden bridge over the KCS Railroad on Nichols Street at the William Woods University campus in Fulton
Open to two-lane traffic

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

Nix Creek Bridge (Miller County, Arkansas)
Nix Creek Bridge east 9th street Texarkana Arkansas. Built 1950 by Clark Brothers Construction Company.
Stringer bridge over Nix Creek on East 9th Street / US 82
Open to traffic

Noix Creek MO 79 Bridge (Pike County, Missouri)
Built 1935
Pony truss bridge over Noix Creek on MO 79 in Louisiana
Open to two-lane traffic

Noleman Street Underpass (Marion County, Illinois)
Built 1954
Steel stringer bridge over eastbound IL 161 - Noleman Street on Illinois Central Railroad in Centralia
Open to traffic

Nora Junction Railroad Bridge (Floyd County, Iowa)
Bridge over Shell Rock River on I and M Railroad just south of 1st Street Bridge
Open to traffic

Norfolk Southern French Broad Bridge #6 (Cocke County, Tennessee)
Pony/through plate girder bridge over French Broad River (Douglass Lake) on Norfolk Southern Railroad--Bridge is Number 6 because it is the 6th French Broad River bridge on the railroad from Asheville to Knoxville
Open to traffic

Norfolk Southern Holston Bridge (Hawkins County, Tennessee)
3-span Howe truss bridge over Holston River on Norfolk Southern Railroad
Open to traffic

Norfolk-Southern French Broad Bridge #4 (Cocke County, Tennessee)
Deck plate girder bridge over French Broad River on Norfolk-Southern Railway
Open to traffic

Norfolk-Southern French Broad Bridge #5 (Cocke County, Tennessee)
Built 1927
Baltimore (Pratt) truss bridge on Norfolk-Southern Railway
Open to traffic

Norfolk-Southern Pigeon River Bridge (Cocke County, Tennessee)
Built 1916 by the American Bridge Company U.S.A.
Howe through truss bridge over Pigeon River on Norfolk-Southern Railway in Newport
Open to traffic

Norfork Bridge (Baxter County, Arkansas)
Construction started Aug. 21, 1936, by the Vincennes Steel Company; dedicated June 17, 1937
Four-span deck truss bridge over North Fork White River on AR 5 at Norfork
Open to traffic

Norfork Railroad Bridge (Baxter County, Arkansas)
Built ca. 1909
Three-span through truss bridge over North Fork White River and Prospect Street on the railroad at Norfork
Open to railroad traffic

Norris Ford Bridge (Rush County, Indiana)
Built 1916 by E. L. Kennedy
Covered bridge over Flatrock River on CR 300 North
Open to traffic

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 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 Boat Ditch US 67 Bridge (Clark County, Arkansas)
Built 1931 by the Virginia Bridge & Iron Co. of Roanoke, Virginia
Pony truss bridge over North Boat Ditch of Terre Noire Creek on US 67
Open to traffic

North Branch Root River Bridge (Fillmore County, Minnesota)
Built 1939
Through truss bridge over North Branch Root River on CR 124
Open to traffic

North Branch Root River MN 250 Bridge (Fillmore County, Minnesota)
Built 1924
Through truss bridge over North Branch Root River on MN 250
Open to traffic

North Broadway over the Los Angeles River (Los Angeles County, California)
Built 1909; rehabilitated 1974
Concrete arch bridge over L A Riv,Bnsf,Uprr,Metro, on North Broadway in Los Angeles
Open to traffic

North Cayuga Street Bridge (Tompkins County, New York)
Built 1934; rehabilitated 2002
Pony truss bridge over Fall Creek on North Cayuga Street in Ithaca
Open to traffic

North Creek Bridge (Washington County, Illinois)
Built ca. 1930; rehabilitated 1970
Pony truss bridge over North Creek on TR 162A, 1.5 mi. northwest of Huegely
Open to one-lane traffic with a 10 ton weight limit

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 Big Nemaha River Bridge (Richardson County, Nebraska)
Built 1955
Truss bridge over North Fork Big Nemaha River on NE 8 in Salem
Open to traffic

North Fork Coal Creek Bridge (Fountain County, Indiana)
Built 1901
Through truss bridge over North Fork Coal Creek on CR 200 East
Open to traffic

North Fork Coal Creek Bridge (Fountain County, Indiana)
Built 1915
Through truss bridge over North Fork Coal Creek on CR 500 East
Open to traffic

North Fork Holston River Bridge (Scott County, Virginia)
Built 1930
Through truss bridge over North Fork Holston River on U.S. 58 - 421
Open to traffic

North Fork Holston River CSX Railroad Bridge (Sullivan County, Tennessee)
Construction started in 1907 by the South and Western Railroad Co., and finished in 1908 by its successor, the Carolina, Clinchfield and Ohio Railroad Company (now CSX)
3-span Howe through truss railroad bridge over North Fork Holston River on CSX Railroad in Kingsport
Open to rail traffic

North Fork Little Maquoketa River Bridge (Dubuque County, Iowa)
Built 1901
Pony truss bridge over North Fork Little Maquoketa River on a local road
Open to 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 Rogue River Bridge (Jackson County, Oregon)
Built 1930
Concrete arch bridge over North Fork Rogue River on CR 797
Open to traffic

North Fork Route H Bridge (Jasper County, Missouri)
Built 1933
Pony truss bridge over North Fork Spring River on Route H
Open to 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 Lake Railroad Bridge (Waukesha County, Wisconsin)
Built 1911
Bridge over Wisc 83 on UPRR (Formerly C&NW) in North Lake (Town of Merton)
Open to traffic

North Main Street over the Los Angeles River (Los Angeles County, California)
Built 1910
Concrete arch bridge over Los Angeles River on N Main Street in Los Angeles
Open to traffic

North River Bridge (Madison County, Iowa)
Built ca. 1920; rehabilitated 1967
Through truss bridge over North River on a local road
Open to traffic

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

North Spring Street over the Los Angeles River (Los Angeles County, California)
Built 1928; rehabilitated 1939, seismic upgrade 1992
Concrete arch bridge over Los Angeles River on North Spring Street in Los Angeles
Open to traffic