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Built during 1970s

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Markley Ranch Road Bridge (Gallatin County, Montana)
Built 1970
Pony truss bridge over Gallatin River on Markley Ranch Road
Open to traffic

Marquette-Joliet Bridge (Clayton County, Iowa)
Built 1974
Steel through arch bridge over Mississippi River on US 18 between Marquette and Prairie du Chien
Open to traffic

Martha Mitchell Expressway Pedestrian Bridge (Jefferson County, Arkansas)
Built 1971
Pedestrian arch bridge over Martha Mitchell Expressway (US 65B)
Open to pedestrians

Mason Street Bridge (Brown County, Wisconsin)
Built 1973
Bascule bridge over Fox River on Mason Street (WI 54) in Green Bay
Open to traffic

Mckissic Creek Bridge (Benton County, Arkansas)
Built 1973, Destroyed by Flooding 2013
Lost Beam bridge over Mckissic Creek on CR 40
Destroyed by flooding

McLennan Reed Bridge (Lake County, Illinois)
Built 1979
Steel stringer bridge over ravine on Lake Road
Open to traffic

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

MER - OH83 Overpass #2 (Noble County, Ohio)
Built 1975; Removed 2002
Lost Steel stringer bridge over OH 83 on Muskingum Electric Railroad
Removed

Meridian Bridge (1977) (Sutter County, California)
Built 1977
Cable-stayed swing bridge over Sacramento River on CA 20 at Meridian
Open to traffic

Mertz Covered Bridge 38-49-B (Northumberland County, Pennsylvania)
Built 1976 by property owner using beams from nearby dismantled barn
Kingpost pony truss bridge over Unnamed creek on Mirkwood Road (private drive)
Open to traffic

Michigan Street Bridge (Milwaukee County, Wisconsin)
Built 1978
Vertical lift bridge over Milwaukee River on Michigan Street in Milwaukee
Open to traffic

Middle Falls Bridge (Replacement) (Washington County, New York)
Concrete tee beam bridge over BATTEN KILL on RTE 29
Open to traffic

Middle Lick Creek CR 472 Bridge (Audrain County, Missouri)
Built 1977; replaced 2005
Lost pony truss bridge over Middle Lick Creek on CR 472
No longer exists

Middle Tarkio River Bridge (Page County, Iowa)
Built ca. 1970; rehabilitated 1990; removed recently
Through truss bridge over Middle Tarkio River on 150th Street
Removed but not replaced

Middleton Creek Bridge (Franklin County, Mississippi)
Built 1973
Pony truss bridge over Middleton Creek on Middleton Creek Road
Open to traffic

Midland Valley - OK9 Overpass (Haskell County, Oklahoma)
Built 1970
Steel stringer bridge over S.H. 9 on T. & P. R.R.
Open to pedestrains & bike traffic

Mile Long Bridge (Polk County, Iowa)
Built 1973; Abutments rebuilt 2014
Steel stringer bridge over Saylorville Lake (Des Moines river) on Iowa Highway 415
Open to traffic

Mill Creek Bridge (Sebastian County, Arkansas)
Built 1973
Steel stringer bridge over Mill Creek on Jenny Lind Road in Fort Smith
Open to traffic

Mill Creek Bridge (Lincoln County, Missouri)
Bridge over Mill Creek on Route E
Open to traffic

Mill Street Bridge-Vermillion River (Replacement) (Livingston County, Illinois)
Bridge
Open to traffic

Mill Street-Mill Creek Bridge (Replacement) (Potter County, Pennsylvania)
Bridge
Open to traffic

Miller Branch Bridge (Saunders County, Nebraska)
Built ca. 1970
Pony truss bridge over Miller Branch on CR G, 2.4 mi. east and 3 mi. south of Weston
Open to traffic

Miller-Sweeney Bridge (Alameda County, California)
Constructed 1974
Bascule over Oakland Estuary on Fruitvale Avenue
Open to traffic

MILW - Fairmount Street Overpass (Woodbury County, Iowa)
Built 1972
Lost Girder bridge over Fairmount Street on Chicago, Milwaukee, St. Paul & Pacific Railroad
Removed

MILW - I-90 Overpass (Jackson County, Minnesota)
Built 1973, abandoned 1981
Abandoned pony/through girder bridge over Interstate 90 on Abandoned Milwaukee Road Railroad
Abandoned

Mineral Creek Bridge (Valdez-Cordova Census Area, Alaska)
Built 1970
Bailey pony truss bridge over Mineral Creek on Mineral Creek Road
Open to traffic

Mingo Ditch CR 697 Bridge (Stoddard County, Missouri)
Built or relocated here 1974; replaced 1995
Lost pony truss bridge(?) over Mingo Ditch on CR 697
Replaced by new bridge

Mininghill Farm Bridge (Caledonia County, Vermont)
Original bridge built 1976; Twinned 1981; both bridges rehabilitated 2014
Steel stringer bridge over Connecticut River on Interstate 93 (Styles Bridges Highway)
Open to traffic

Mississippi River Bridge (Cass County, Minnesota)
Built 1979
Stringer bridge over Mississippi River on Cty Hwy 18
Open to traffic

Mixon Creek Bridge (Forrest County, Mississippi)
Built 1970
Beam bridge over Mixon Creek on Campbell Scenic Drive
Closed to all traffic

MN77 Minnesota River Bridge (Hennepin County, Minnesota)
Built 1978
Steel through arch bridge over Minnesota R & Black Dog on MN 77 N& S bounds
Open to traffic

MNA - Harry S. Truman Reservoir Bridge (Henry County, Missouri)
Built in 1971 with the formation of Harry S. Truman Reservoir bypassing the original line now removed/submerged
Deck girder bridge over Harry S. Truman Reservoir on Missouri and North Arkansas Railroad (former Missouri-Kansas-Texas Railroad)
Open to traffic

MO 79 S over BOBS CR (Lincoln County, Missouri)
Bridge over Bob's Creek on MO 79 S
Open to traffic

Montgomery Woods Bridge (Mendocino County, California)
Built 1971
Steel stringer bridge over South Fork Big River on Orr Springs Road
Open to traffic

Moore Creek Bridge (Washington County, Arkansas)
Built 1970, Destroyed by flooding 2011
Lost Culvert bridge over Moore Creek on CR 33 (Wedington Blacktop Rd)
Destroyed by flood

Mopac Trail - US34 Overpass (Lancaster County, Nebraska)
Built 1971
Steel stringer bridge over US 34 on Mopac Trail
Open to pedestrians only

Morgan Bridge (Grant County, Oregon)
Built 1976
Polygonal Warren pony truss bridge over John Day River on CR 57 (Morgan Road)
Open to traffic

Moss Brook Street Over Van Campen Creek (Allegany County, New York)
Stringer bridge over VANCAMPEN CREEK on COUNTY ROAD 31
Open to traffic

Moulton Falls Bridge (Clark County, Washington)
Built 1976
Timber arch bridge over East Fork Lewis River on Trail
Open to pedestrians only

Mud Creek Bridge (Washington County, Arkansas)
Built 1972
Beam bridge over Mud Creek on Front Street in Fayetteville
Open to traffic

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

Murray Lake Bridge (Pulaski County, Arkansas)
Built 1974
Haunched deck plate girder bridge over Arkansas River (Murray Lake) on Interstate 430
Open to traffic

Muscatine Bridge (Muscatine County, Iowa)
Built 1972; Tolls removed 1987
Polygonal Warren through truss bridge over Mississippi River on IA 92/IL 92 at Muscatine
Open to traffic

N Jasper Road-Tuscarora Creek Bridge(Replacement) (Steuben County, New York)
Built 1972; rehabilitated 1995
Steel stringer bridge over Tuscarora Creek on CR 71
Open to traffic

N. 50th Street Menomonee River Bridge (Milwaukee County, Wisconsin)
Built 1976
Pony truss bridge over Menomonee River on N. 50th Street in Milwaukee
FOUND! This elusive bridge is well hidden but extant behind private property.

Nalley Valley Viaduct (Pierce County, Washington)
Built 1970; replaced 2011
Lost Concrete tee beam bridge over Nalley Valley Viaduct on WA 16
Replaced by new bridge

National Ditch Bridge (Mississippi County, Arkansas)
Built 1978
Steel stringer bridge over National Ditch on Sh 158
Open to traffic

Naziare Biron Bridge (Hillsborough County, New Hampshire)
Built 1973 to replace previous Kelley Street Bridge; Rehabilitated 2012 with full bridge closure
Steel stringer bridge over Piscataquog River on Kelley Street/Pinard Street
Open to traffic

NC 200 Rocky River Bridge (Union County, North Carolina)
Built 1973
Steel stringer bridge over Rocky River on NC Highway 200
Open to traffic

Nehalem River Bridge (Columbia County, Oregon)
Built 1973
Stringer bridge over Nehalem River on Timber Road
Open to traffic

Nenana River Bridge (Denali Borough, Alaska)
Built 1970
Deck truss bridge over Nenana River At Moody on Parks Highway
Open to traffic

Neponset River Bridge (Suffolk County, Massachusetts)
Built 1970
Steel stringer bridge over Neponset River on Massachusetts Route 3A
Open to traffic

Neville Island Bridge (Allegheny County, Pennsylvania)
Built 1976; rehabilitated 2008
Steel through arch bridge over Ohio River on I-79
Open to traffic

New England College Covered Bridge 29-07-12 (Merrimack County, New Hampshire)
Built 1972
Town lattice truss bridge over Contoocook River on Footbridge
Open to pedestrians only

New Hope-Lambertville Toll Bridge (Bucks County, Pennsylvania)
Built 1971
Deck plate girder bridge over Delaware River on U.S. Route 202
Open to traffic

New Madrid County Road 240 Bridge (New Madrid County, Missouri)
Built 1974
Steel stringer bridge over Drainage ditch on CR 240
Open to traffic

New Madrid County Road 248 Bridge (New Madrid County, Missouri)
Built 1976
Steel stringer bridge over Drainage ditch on CR 248
Open to traffic

New Madrid County Road 352 Bridge (New Madrid County, Missouri)
Built 1977
Lost steel stringer bridge over Drainage ditch on CR 352
Removed but not replaced

New Madrid County Road 405 Bridge (New Madrid County, Missouri)
Built 1975; rehabilitated 1980
Lost wooden deck bridge over Drain Dtch on CR 405 near the end of Route AB
Replaced by a new culvert

New Madrid County Road 534 Bridge (New Madrid County, Missouri)
Built 1970; rehabilitated 1986
Steel stringer bridge over Caney Slough on CR 534
Open to traffic

New Madrid County Road 613 Bridge (New Madrid County, Missouri)
Built 1975; rehabilitated 1994
Wooden deck bridge over a drainage ditch on CR 613
Open to traffic

New Madrid County Road 630 Bridge (New Madrid County, Missouri)
Built 1974
Steel stringer bridge over Drainage ditch on CR 630
Open to traffic

New Madrid County Road 740 Bridge (New Madrid County, Missouri)
Built ca. 1975
Lost wooden deck bridge over a drainage ditch on CR 740
Destroyed by flooding

New Madrid County Road 808 Bridge (New Madrid County, Missouri)
Built 1975; rehabilitated 1986
Wooden deck bridge over St. Johns Drainage Ditch on CR 808
Open to traffic

New Madrid County Road 824 Bridge (New Madrid County, Missouri)
Built 1975
Wooden deck bridge over Otter Slough Ditch on CR 824
Open to traffic

New Madrid County Road 828 Bridge (New Madrid County, Missouri)
Built 1975
Steel stringer bridge over Drainage ditch on CR 828
Open to traffic

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

Nishnabotna River Bridge (Audubon County, Iowa)
Built or relocated 1977
Pony truss bridge over Nishnabotna River on Lark Avenue
Open to traffic

Noland Creek Bridge (Swain County, North Carolina)
Built 1971 as part of the planned "North Shore Road".
Concrete stringer bridge over Noland Creek on Lakeview Drive
Open to traffic

Norfolk Southern - Broadway Avenue Overpass (Blount County, Tennessee)
Built 1972
Bridge over E Broadway Avenue on Norfolk Southern Railway
Open to traffic

North Branch Kokosing Bridge (Knox County, Ohio)
Built 1978
Steel stringer bridge over North Branch Kokosing on Upper Fredericktown Road
Open to traffic

North Fork Salt River Bridge (Monroe County, Missouri)
Built 1977
Steel stringer bridge over North Fork Salt River on Mo 107
Open to traffic

North Fork Skykomish River Bridge (Snohomish County, Washington)
Built 1970
Steel stringer bridge over North Fork Skykomish River on Index-Galena Road
Open to traffic

North Suck Creek Suspension Bridge (Marion County, Tennessee)
Built 1979
Wire suspension bridge over North Suck Creek on Cumberland Trail
Open to pedestrians only

Norwalk River Bridge (Fairfield County, Connecticut)
Built 1972
Bascule bridge over Norwalk River on CT 136 Washington Street in Norwalk
Open to traffic

Nose Rock Wash Bridge (McKinley County, New Mexico)
Built 1977
Pony truss bridge over Nose Rock Wash on CR 43
Open to traffic

NS - Baker St. Bridge (North) (Steuben County, New York)
Built 1977
Girder bridge over Baker St. on Norfolk Southern
Open to traffic

NS - Black River Lift Bridge (Lorain County, Ohio)
Built 1974
Through truss bridge over Black River on Norfolk Southern Railroad
Open to traffic

NS - Calumet River Bridge (Cook County, Illinois)
Built 1971
Warren through truss bridge over Calumet River on Norfolk Southern Railroad (former Nickel Plate Ry)
Open

NS - Decatur Drawbridge (1979) (Limestone County, Alabama)
First bridge built on this spot was burned during the Civil War, replaced with a pontoon bridge. A swing bridge was built in 1885, and it was replaced by this modern drawbridge in 1978-79.
Vertical Lift Drawbridge over Tennessee River in Decatur
Open to traffic

NS - Goodwins Chapel Road Overpass (Mercer County, West Virginia)
Built 1970
Pony/through plate girder bridge over Goodwins Chapel Road/East River on Railroad
Open to traffic

NS - I-72 Overpass (Morgan County, Illinois)
Built 1975
Pony/through plate girder bridge over Interstate 72 on Norfolk Southern Railway
Open to traffic

NS - N Westgate Avenue Overpass (Morgan County, Illinois)
Built 1977
Pony/through plate girder bridge over N Westgate Avenue on Norfolk Southern Railway
Open to traffic

NS - Rollins Street Overpass (Randolph County, Missouri)
Original bridge at this location built 1858; renewed1897; rebuilt 1921; rebuilt 1974
Steel stringer bridge over Rollins St. on N&W, now NS Railroad
Open to rail traffic

NS - Winchester Bridge (Adams County, Ohio)
Built 1975
Deck girder bridge over Elk Fork on Norfolk & Southern Railroad


Oak Street Bridge (Yellow Medicine County, Minnesota)
Built 1974 replacing a pin-connected Camelback through truss bridge with A-frame portal bracing.
Steel stringer bridge over Minnesota River on Oak Street (CSAH 22 and CSAH 38-Renville Co.)
Open to traffic

Odd Fellows Park Road (Sonoma County, California)
Built 1977; rehabilitated 2008
Steel stringer bridge over Russian River on Odd Fellows Park Road
Open to traffic

Ogden Street Bridge (Marinette County, Wisconsin)
Built 1973
Bascule bridge over Menominee River on Ogden Street in Marinette / 1st Street in Menominee
Open to traffic

Ohio River I-275 Bridge (Campbell County, Kentucky)
Built 1979
Pair of through truss bridges over the Ohio River on I-275
Open to traffic

Olalla Bay Bridge (Kitsap County, Washington)
Built 1972
Slab bridge over Olalla Bay on Crescent Valley Rd SE
Open to traffic

Old Cap Au Gris Road Bridge (Lincoln County, Missouri)
Bridge over US Hwy 61 on Old Cap Au Gris Road
Open to traffic

Old Frame Road Bridge (Buchanan County, Missouri)
Built ca. 1970
Steel stringer bridge over Branch of Bee Creek on SE Old Frame Road
Unknown status: NBI shows new bridge was under construction in 2010

Old Latrobe Road Bridge (El Dorado County, California)
Built 1970; bypassed and converted to path 2012.
Slab bridge over Carson Creek on old alignment of Latrobe Road (now pathway)
Open to pedestrians only

Old Phily Pike-Leaf Creek Bridge (Berks County, Pennsylvania)
Built 1971
Beam bridge over Leaf Creek on Old Phily Pike
Open to traffic

Old Union Crossing Covered Bridge 01-25-A (De Kalb County, Alabama)
Original covered bridge built by Union Army in 1864, covered Kingpost truss portion moved to current location and rebuilt on existing steel cable bridge in 1972, rebuilt and restored by Jack Jones, 1980
Warren through truss wooden bridge over Little River, West Fork on County Road 614
Open to traffic

Opossum Creek CR 501 Bridge (Bollinger County, Missouri)
Built 1975
Wooden bridge over Opossum Creek on CR 501
Open to one-lane traffic

OPPD - 4th Terrace Bridge (Otoe County, Nebraska)
Built 1970 to replace an older girder
Steel stringer bridge over 4th Terrace on Omaha Public Power District owned rail line
Open to traffic

Oregon Avenue Bridge (Taylor County, Iowa)
Built 1978
Pony truss bridge over Branch East Fork One Hundred and Two River on Oregon Avenue
Open to traffic

Osage River MO 7 New Bridge (Benton County, Missouri)
Bridge on Mo Highway 7
Open to traffic

Otego Bridge (Replacement) (Otsego County, New York)
Steel stringer bridge over MP562.78 DEL HUD, Susque on RTE 991J
Open to traffic