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Built during 1970s
View Exhibit mapMarkley Ranch Road Bridge (Gallatin County, Montana)
Built 1970Pony truss bridge over Gallatin River on Markley Ranch RoadOpen to traffic
Marquette-Joliet Bridge (Clayton County, Iowa)
Built 1974Steel through arch bridge over Mississippi River on US 18 between Marquette and Prairie du ChienOpen to traffic
Mason Street Bridge (Brown County, Wisconsin)
Built 1973Bascule bridge over Fox River on Mason Street (WI 54) in Green BayOpen to traffic
Mckissic Creek Bridge (Benton County, Arkansas)
Built 1973, Destroyed by Flooding 2013Lost Beam bridge over Mckissic Creek on CR 40Destroyed by flooding
McLennan Reed Bridge (Lake County, Illinois)
Built 1979Steel stringer bridge over ravine on Lake RoadOpen to traffic
McNally Bridge (Somerset County, Pennsylvania)
Built 1970; rehabilitated 2012Deck girder bridge over Stonycreek River on US 219Open to traffic
MER - OH83 Overpass #2 (Noble County, Ohio)
Built 1975; Removed 2002Lost Steel stringer bridge over OH 83 on Muskingum Electric RailroadRemoved
Meridian Bridge (1977) (Sutter County, California)
Built 1977Cable-stayed swing bridge over Sacramento River on CA 20 at MeridianOpen to traffic
Mertz Covered Bridge 38-49-B (Northumberland County, Pennsylvania)
Built 1976 by property owner using beams from nearby dismantled barnKingpost pony truss bridge over Unnamed creek on Mirkwood Road (private drive)Open to traffic
Michigan Street Bridge (Milwaukee County, Wisconsin)
Built 1978Vertical lift bridge over Milwaukee River on Michigan Street in MilwaukeeOpen to traffic
Middle Tarkio River Bridge (Page County, Iowa)
Built ca. 1970; rehabilitated 1990; removed recentlyThrough truss bridge over Middle Tarkio River on 150th StreetRemoved but not replaced
Middleton Creek Bridge (Franklin County, Mississippi)
Built 1973Pony truss bridge over Middleton Creek on Middleton Creek RoadOpen to traffic
Midland Valley - OK9 Overpass (Haskell County, Oklahoma)
Built 1970Steel 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 2014Steel stringer bridge over Saylorville Lake (Des Moines river) on Iowa Highway 415Open to traffic
Mill Creek Bridge (Sebastian County, Arkansas)
Built 1973Steel stringer bridge over Mill Creek on Jenny Lind Road in Fort SmithOpen to traffic
Mill Creek Bridge (Lincoln County, Missouri)
Bridge over Mill Creek on Route EOpen to traffic
Miller Branch Bridge (Saunders County, Nebraska)
Built ca. 1970Pony truss bridge over Miller Branch on CR G, 2.4 mi. east and 3 mi. south of WestonOpen to traffic
Miller-Sweeney Bridge (Alameda County, California)
Constructed 1974Bascule over Oakland Estuary on Fruitvale AvenueOpen to traffic
MILW - Fairmount Street Overpass (Woodbury County, Iowa)
Built 1972Lost Girder bridge over Fairmount Street on Chicago, Milwaukee, St. Paul & Pacific RailroadRemoved
MILW - I-90 Overpass (Jackson County, Minnesota)
Built 1973, abandoned 1981Abandoned pony/through girder bridge over Interstate 90 on Abandoned Milwaukee Road RailroadAbandoned
Mineral Creek Bridge (Valdez-Cordova Census Area, Alaska)
Built 1970Bailey pony truss bridge over Mineral Creek on Mineral Creek RoadOpen to traffic
Mingo Ditch CR 697 Bridge (Stoddard County, Missouri)
Built or relocated here 1974; replaced 1995Lost pony truss bridge(?) over Mingo Ditch on CR 697Replaced by new bridge
Mininghill Farm Bridge (Caledonia County, Vermont)
Original bridge built 1976; Twinned 1981; both bridges rehabilitated 2014Steel stringer bridge over Connecticut River on Interstate 93 (Styles Bridges Highway)Open to traffic
Mississippi River Bridge (Cass County, Minnesota)
Built 1979Stringer bridge over Mississippi River on Cty Hwy 18Open to traffic
Mixon Creek Bridge (Forrest County, Mississippi)
Built 1970Beam bridge over Mixon Creek on Campbell Scenic DriveClosed to all traffic
MN77 Minnesota River Bridge (Hennepin County, Minnesota)
Built 1978Steel through arch bridge over Minnesota R & Black Dog on MN 77 N& S boundsOpen 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/submergedDeck girder bridge over Harry S. Truman Reservoir on Missouri and North Arkansas Railroad (former Missouri-Kansas-Texas Railroad)Open to traffic
Montgomery Woods Bridge (Mendocino County, California)
Built 1971Steel stringer bridge over South Fork Big River on Orr Springs RoadOpen to traffic
Moore Creek Bridge (Washington County, Arkansas)
Built 1970, Destroyed by flooding 2011Lost Culvert bridge over Moore Creek on CR 33 (Wedington Blacktop Rd)Destroyed by flood
Mopac Trail - US34 Overpass (Lancaster County, Nebraska)
Built 1971Steel stringer bridge over US 34 on Mopac TrailOpen to pedestrians only
Morgan Bridge (Grant County, Oregon)
Built 1976Polygonal Warren pony truss bridge over John Day River on CR 57 (Morgan Road)Open to traffic
Moulton Falls Bridge (Clark County, Washington)
Built 1976Timber arch bridge over East Fork Lewis River on TrailOpen to pedestrians only
Mud Creek Bridge (Washington County, Arkansas)
Built 1972Beam bridge over Mud Creek on Front Street in FayettevilleOpen to traffic
Murray Avenue Bridge (Allegheny County, Pennsylvania)
Built 1978Steel rigid frame bridge over Beechwood Blvd. & I-376 Ramp G on Murray Avenue BridgeOpen to traffic
Murray Lake Bridge (Pulaski County, Arkansas)
Built 1974Haunched deck plate girder bridge over Arkansas River (Murray Lake) on Interstate 430Open to traffic
Muscatine Bridge (Muscatine County, Iowa)
Built 1972; Tolls removed 1987Polygonal Warren through truss bridge over Mississippi River on IA 92/IL 92 at MuscatineOpen to traffic
N. 50th Street Menomonee River Bridge (Milwaukee County, Wisconsin)
Built 1976Pony truss bridge over Menomonee River on N. 50th Street in MilwaukeeFOUND! This elusive bridge is well hidden but extant behind private property.
Nalley Valley Viaduct (Pierce County, Washington)
Built 1970; replaced 2011Lost Concrete tee beam bridge over Nalley Valley Viaduct on WA 16Replaced by new bridge
National Ditch Bridge (Mississippi County, Arkansas)
Built 1978Steel stringer bridge over National Ditch on Sh 158Open to traffic
Naziare Biron Bridge (Hillsborough County, New Hampshire)
Built 1973 to replace previous Kelley Street Bridge; Rehabilitated 2012 with full bridge closureSteel stringer bridge over Piscataquog River on Kelley Street/Pinard StreetOpen to traffic
NC 200 Rocky River Bridge (Union County, North Carolina)
Built 1973Steel stringer bridge over Rocky River on NC Highway 200Open to traffic
Nehalem River Bridge (Columbia County, Oregon)
Built 1973Stringer bridge over Nehalem River on Timber RoadOpen to traffic
Nenana River Bridge (Denali Borough, Alaska)
Built 1970Deck truss bridge over Nenana River At Moody on Parks HighwayOpen to traffic
Neponset River Bridge (Suffolk County, Massachusetts)
Built 1970Steel stringer bridge over Neponset River on Massachusetts Route 3AOpen to traffic
Neville Island Bridge (Allegheny County, Pennsylvania)
Built 1976; rehabilitated 2008Steel through arch bridge over Ohio River on I-79Open to traffic
New Madrid County Road 405 Bridge (New Madrid County, Missouri)
Built 1975; rehabilitated 1980Lost wooden deck bridge over Drain Dtch on CR 405 near the end of Route ABReplaced by a new culvert
New Madrid County Road 808 Bridge (New Madrid County, Missouri)
Built 1975; rehabilitated 1986Wooden deck bridge over St. Johns Drainage Ditch on CR 808Open to traffic
New River Gorge Bridge (Fayette County, West Virginia)
Opened on October 22, 1977Massive steel arch bridge over New River on US 19 east of FayetteOpen to traffic
Nishnabotna River Bridge (Audubon County, Iowa)
Built or relocated 1977Pony truss bridge over Nishnabotna River on Lark AvenueOpen 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 DriveOpen to traffic
North Branch Kokosing Bridge (Knox County, Ohio)
Built 1978Steel stringer bridge over North Branch Kokosing on Upper Fredericktown RoadOpen to traffic
Norwalk River Bridge (Fairfield County, Connecticut)
Built 1972Bascule bridge over Norwalk River on CT 136 Washington Street in NorwalkOpen to traffic
Nose Rock Wash Bridge (McKinley County, New Mexico)
Built 1977Pony truss bridge over Nose Rock Wash on CR 43Open to traffic
NS - Black River Lift Bridge (Lorain County, Ohio)
Built 1974Through truss bridge over Black River on Norfolk Southern RailroadOpen to traffic
NS - Calumet River Bridge (Cook County, Illinois)
Built 1971Warren 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 DecaturOpen to traffic
NS - Goodwins Chapel Road Overpass (Mercer County, West Virginia)
Built 1970Pony/through plate girder bridge over Goodwins Chapel Road/East River on RailroadOpen to traffic
NS - I-72 Overpass (Morgan County, Illinois)
Built 1975Pony/through plate girder bridge over Interstate 72 on Norfolk Southern RailwayOpen to traffic
NS - N Westgate Avenue Overpass (Morgan County, Illinois)
Built 1977Pony/through plate girder bridge over N Westgate Avenue on Norfolk Southern RailwayOpen to traffic
NS - Rollins Street Overpass (Randolph County, Missouri)
Original bridge at this location built 1858; renewed1897; rebuilt 1921; rebuilt 1974Steel stringer bridge over Rollins St. on N&W, now NS RailroadOpen to rail traffic
NS - Winchester Bridge (Adams County, Ohio)
Built 1975Deck 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 2008Steel stringer bridge over Russian River on Odd Fellows Park RoadOpen to traffic
Ogden Street Bridge (Marinette County, Wisconsin)
Built 1973Bascule bridge over Menominee River on Ogden Street in Marinette / 1st Street in MenomineeOpen to traffic
Ohio River I-275 Bridge (Campbell County, Kentucky)
Built 1979Pair of through truss bridges over the Ohio River on I-275Open to traffic
Olalla Bay Bridge (Kitsap County, Washington)
Built 1972Slab bridge over Olalla Bay on Crescent Valley Rd SEOpen to traffic
Old Frame Road Bridge (Buchanan County, Missouri)
Built ca. 1970Steel stringer bridge over Branch of Bee Creek on SE Old Frame RoadUnknown 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 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, 1980Warren through truss wooden bridge over Little River, West Fork on County Road 614Open to traffic
OPPD - 4th Terrace Bridge (Otoe County, Nebraska)
Built 1970 to replace an older girderSteel stringer bridge over 4th Terrace on Omaha Public Power District owned rail lineOpen to traffic
Oregon Avenue Bridge (Taylor County, Iowa)
Built 1978Pony truss bridge over Branch East Fork One Hundred and Two River on Oregon AvenueOpen to traffic
Otego Bridge (Replacement) (Otsego County, New York)
Steel stringer bridge over MP562.78 DEL HUD, Susque on RTE 991JOpen to traffic
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