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Morgan Road Bridge (Jefferson County, Indiana)
Built ca. 1910; rehabilitated 1935
Pony truss bridge over Middlefork Creek on Morgan Road in Big Oaks F&W Area.
Open to traffic but with access limited by request.

Morton-State Line Ridge Tunnel (Sevier County, Tennessee)
Built as one of 3 masonry-faced tunnels, along with bridges, on the New Found Gap Road
Tunnel under spur of State Line Ridge on U.S. 441 New Found Gap Road (formerly Indian Gap Highway), Great Smoky Mountains National Park, Tennessee
Open to traffic

Mott Bridge (Douglas County, Oregon)
Built 1936; rehabilitated 1983
Timber braced spandrel arch bridge over North Umpqua River on USFS Road 4712
Open to traffic

Mount Wilson Toll Road Bridge (Los Angeles County, California)
Built by The Pasadena and Mount Wilson Toll Road Company 1891, Replaced by the Nat'l Forrest Service, Date unknown
Concrete stringer bridge over Eaton Canyon Wash on Mt. Wilson Toll Road in Angeles National Forrest
Closed to all traffic

Mountain Pass Road Blue Ridge Parkway Bridge (Botetourt County, Virginia)
Built 1946
Concrete rigid frame bridge over Mountain Pass Rd on Blue Ridge Parkway
Open to traffic

MSTL - Pope Creek Bridge (Mercer County, Illinois)
Built 1904
Abandoned Modified Warren through truss bridge over Pope Creek on Abandoned C&NW Railroad
Derelict/abandoned

Muddy Fork Cowlitz River Bridge (Lewis County, Washington)
Built 1952
Concrete arch bridge over Muddy Fork Cowlitz River on Stevens Canyon Road
Open to traffic

Muddy Fork Sandy River Bridge (Clackamas County, Oregon)
Built 2011
Pratt pony truss bridge over Sandy River on USFS Road 1825
Open to traffic

Narada Falls Bridge (Lewis County, Washington)
Built 1928
Arch bridge over Paradise River on Paradise Connection
Open to traffic

Natchez Trace MS 27 Bridge (Hinds County, Mississippi)
Built 1961
Concrete arch bridge over Natchez Trace Parkway on MS 27
Open to traffic

Needle's Eye Tunnel (Boulder County, Colorado)
Built 1903-1905; Bypassed 1928; Abandoned 1935; Reopened as a road 1955-1979 and 1988-1990.
Tunnel on Abandoned Moffat Road
Closed to all traffic

Needles Eye Tunnel (Custer County, South Dakota)
Tunnel on SD 87
Open to traffic

Nettle Creek Road Blue Ridge Parkway Bridge (Amherst County, Virginia)
Built 1950
Concrete rigid frame bridge over Nettle Creek Rd on Blue Ridge Parkway
Open to traffic

New Alexander Bridge (Catoosa County, Georgia)
Built 2011
Warren pony truss with alternating verticals bridge over West Chickamauga Creek on Alexander Bridge Rd
Open to traffic

New River Trail - Ivanhoe Iron Furnace Trestle (Wythe County, Virginia)
Timber stringer bridge over Route 764/tributary of New River on New River Trail (Formerly Norfolk and Western Railway)
Open to pedestrians only

Nez Perce Creek Bridge (Teton County, Wyoming)
Built 1935; rehabilitated 1997
Slab bridge over Nez Perce Creek on Grand Loop Road
Open to traffic

NH - Gracey Avenue Overpass (New Haven County, Connecticut)
Last used ca. 1966; line still owned by Suzio (York Hill Quarry)
Abandoned steel stringer bridge over Gracey Avenue on New Haven Railroad
Derelict/abandoned

NH - Seymour Covered Bridge (New Haven County, Connecticut)
Built 1849 ; One span removed & replaced by a Keystone span 1879; Other span replaced ca. 1896
Lost Bridge over Naugatuck River on New York, New Haven & Hartford Railroad
Replaced by a new bridge

Nickel Creek Bridge (Lewis County, Washington)
Built 1952
Concrete arch bridge over Nickel Creek on Stevens Canyon Road
Open to traffic

Nisqually Glacier Bridge (Pierce County, Washington)
Built 1958
Deck plate girder bridge over Nisqually River on Nisqually Road
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

Norfork Dam Spillway Bridge (Baxter County, Arkansas)
Built 1944; rehabilitated 2008
Slab bridge over Norfork Dam Spillway on Arkansas Hwy 177
Open to traffic

Normandy Road Overpass (Monmouth County, New Jersey)
Built 1935
Concrete pony/through girder bridge over County Road 537 on United States Navy Railroad/Normandy Road
Open to traffic

North Bridge (Middlesex County, Massachusetts)
First bridge built ca 1760; site of Battle of Concord 1775; demolished 1788; rebuilt 1875, 1889, 1909, 1956; rehabilitated 2005
Historic timber stringer bridge over Concord River on Old Groton Road (pedestrian path)
Open to pedestrians

North Carolina 18 Blue Ridge Parkway Bridge (N) (Alleghany County, North Carolina)
Built 1960
Concrete rigid frame bridge over NC 18 on Blue Ridge Parkway
Open to traffic

North Carolina 18 Blue Ridge Parkway Bridge (S) (Alleghany County, North Carolina)
Built 1939
Concrete arch bridge over NC 18 on Blue Ridge Parkway
Open to traffic

North Carolina 80 Blue Ridge Parkway Bridge (Yancey County, North Carolina)
Built 1942
Concrete arch bridge over NC 80 on Blue Ridge Parkway
Open to traffic

North Carolina SR1100 Blue Ridge Parkway Bridge (Mitchell County, North Carolina)
Built 1940
Concrete rigid frame bridge over NC SR1100 on Blue Ridge Parkway
Open to traffic

North Fork Bridge (Placer County, California)
Built 1946
Curved deck truss bridge over North Fork of Middle Fork of American River on FDR 96-Mosquito Ridge Road
Open to traffic

North Fork Sun River Bridge (Lewis and Clark County, Montana)
Built 1916
Warren deck truss bridge over North Fork Sun River on Castle Reef Road
Open to traffic

North Landing Bridge (Chesapeake, Virginia)
Built 1951
Double Swing Pony/through plate girder bridge over A & C Canal on VA-165
Open to traffic

North Springfield Dam Access Bridge (Windsor County, Vermont)
Deck plate girder bridge over Springfield Dam on Restricted Use Road & Walkway
Open to authorized vehicles and authorized pedestrian traffic only

North Umpqua River Bridge (Douglas County, Oregon)
Built 1955, Replaced 2010
Pratt through truss bridge over North Umpqua River on Soda Springs Road
Replaced by a new bridge in 2010

Notman Bridge (Essex County, New York)
Built 1913
Closed-spandrel arch bridge over Ausable River on Adirondack Rd
Open to pedestrians

NSF Indian Head Footbridge (Charles County, Maryland)
Built 1917
Warren pony through truss bascule footbridge over Mattawoman Creek on Pedestrian Traffic
Removed

O&W Bridge (Scott County, Tennessee)
Built in the 1880s; Bridge relocated to this site in 1915 by the Nashville Bridge Co.; Used as a railroad bridge until 1954.
Whipple through truss bridge over Big South Fork Cumberland River on O & W Road
Open to vehicles, horses, and pedestrians

O'Hare Aircraft Overpass (Cook County, Illinois)
Built 1966
Bridge over I-190 on O'Hare International Airport Taxiway
Open to airplane traffic

Oak Creek Bridge (Washington County, Utah)
Built 1926
Slab bridge over Oak Creek on Administrative Access Road
Open to traffic

Oak Creek Bridge (Washington County, Utah)
Bridge over Oak Creek on administrative acess road
Open to traffic

Oak Creek Bridge (Washington County, Utah)
Lost Bridge over Oak Creek on Road
Removed but not replaced

Oak Creek Culvert (Washington County, Utah)
Built 1926
Slab bridge over Oak Creek on Administrative Access Road
Open to traffic

Oak Creek Culvert (Washington County, Utah)
Built 1926
Culvert bridge over Oak Creek on Administrative Access Road
Open to traffic

Obsidian Creek Bridge (Teton County, Wyoming)
Built 1910
Lost Deck plate girder bridge over Obsidian Creek on Indian Creek Campground Road
Replaced by a new bridge in 2012

Ocoee Whitewater Center Bridge (Polk County, Tennessee)
Built 1996
Cable-stayed bridge over Ocoee River on pedestrian pathway
Open to pedestrians only

Oconaluftee River Blue Ridge Parkway Bridge (Swain County, North Carolina)
Built 1957
Girder bridge over Oconaluftee River on Blue Ridge Parkway
Open to traffic

Oconaluftee River Bridge (Swain County, North Carolina)
Built 2005
Pony truss bridge over Oconaluftee River on Tow String Road
Open to traffic

Old Alexander Bridge (Walker County, Georgia)
Built 1901; stone abutments date to 1897; bridge rehabilitated 1971; closed to vehicular traffic 2009, relocated to park in Walker County
Pony truss bridge formerly over West Chickamauga Creek on Alexander Bridge Road
Open to traffic

Old Beatty's Bridge (Union County, South Carolina)
Bridge was replaced in 1962 with newer structure just downstream. Center span has been removed.
Abandoned concrete stringer bridge over Tyger River on Fomerly US-176
Derelict/abandoned

Old Happy Isles Bridge (Mariposa County, California)
Built 1921, Removed 2001
Concrete deck girder bridge over Merced River on Park Path
Removed but not replaced

Old James Creek Bridge (Boulder County, Colorado)
Built ca 1927; bypassed 1959
Concrete stringer bridge over James Creek on Old SR 72
Open to traffic to access parking area

Old Little River Bridge (Sevier County, Tennessee)
Built in 1908 by Little River Lumber Co.
Deck truss bridge over Little River on road/old railroad, Great Smoky Mountains National Park, Tennessee
Closed to all traffic

Old M&NA Buffalo National River Bridge (Searcy County, Arkansas)
Lost Bridge over Buffalo National River; used to carry the Missouri and North Arkansas Railroad
Removed but not replaced; supports are all that remain

Old Martin Mill (Sharp County, Arkansas)
Mill and bridge on Martin's Creek next to US Hwy 63 near Ozark Acres
Open to traffic

Old Pope Canyon Road Bridge (Napa County, California)
Built 1969, Pope Canyon Road realigned 1986, bridge kept open on what is now BLM dead-end residential street.
Arch bridge over Pope Creek on Old Pope Canyon Road
Open to traffic

Old Pryor Creek Crossing (Stewart County, Tennessee)
Built 1924 locally; relocated from Panther Creek in 1940s
Abandoned pony truss bridge over Pryor Creek beyond the end of LBL Road 36
Abandoned

Old River Aux. C.S. Bridge (Concordia Parish, Louisiana)
Built 1986
Stringer bridge over Old River Aux. C.S. on La 0015
Open to traffic

Old River Low Sill C.S. Bridge (Concordia Parish, Louisiana)
Built 1959
Steel stringer bridge over Old River Low Sill C.S. on La0015
Open to traffic

Old Route 8 Bridge (Berkshire County, Massachusetts)
Built in 1927 for Route 8
Through truss bridge over West Branch Farmington River on Colebrook River Road/ Old Route 8
Open to traffic on dead end road

Old Town Bridge (Middlesex County, Massachusetts)
Built 1848
Stone arch bridge over Sudbury River


Old U.S. 64 Brush Creek Bridge (Polk County, Tennessee)
Built on the old 2-lane alignment of U.S. 64, abandoned and left in place when new alignment in 1967 was built higher, 1/4 mile downstream
Abandoned Pratt through truss bridge over Brush Creek on Pre 1967 alignment of US Highway 64
Abandoned

Old US 93 Bridge (Mohave County, Arizona)
Built 1933-34; Bypassed in 2010
Concrete stringer bridge over White Rock Canyon on Old US 93
Open to pedestrians only

Old Wolf Hill Road Bridge (Sumner County, Tennessee)
Abandoned bridge on an abandoned section of Old Wolf Hill Road
Abandoned

Olympic Discovery Trail - Dungeness River Bridge (Clallam County, Washington)
Built 1915, Railroad Abandoned 1985
Timber Howe through truss bridge over Dungeness River on Olympic Discovery Trail (Abandoned Milwaukee Road)
Closed due to flood damage; reopened in 2016

Onslow Beach Road Bridge (Onslow County, North Carolina)
Built 1953
Pony/through plate girder swing bridge over Intracoastal Waterway on Onslow Beach Road
Open to traffic

Otter Cove Bridge (Hancock County, Maine)
Built 1938; rehabilitated 1973
Stone arch bridge over Otter Cove Creek on One-Way Park Loop
Open to traffic

Otter Creek Bridge No. 1 (Teton County, Wyoming)
Built 1934
Concrete rigid frame bridge over Otter Creek on Grand Loop Road
Open to traffic

Otter Creek Bridge No. 2 (Teton County, Wyoming)
Built 1935
Steel stringer bridge over Otter Creek on Grand Loop Road Spur
Open to traffic

Ouachita River Bridge (Polk County, Arkansas)
Bronze plaque: "Constructed 1936, US Department of Agriculture, Forest Service, Maximum load 15 tons
Concrete rigid frame bridge over Ouachita River on CR 97
Open to traffic

Ouachita River CR 97 Bridge (Polk County, Arkansas)
Built 1936
Concrete stringer bridge over Ouachita River on County Road 97
Open to traffic

Outlet Creek Bridge (Pend Oreille County, Washington)
Built 1935, replaced 1994
Lost Timber stringer bridge over Sullivan Lake Outlet on Sullivan Lake Road
Replaced by new bridge

OW - Northfield Tunnel (Delaware County, New York)
Built 1890, abandoned 1957
Abandoned tunnel on New York, Ontario, & Western Railway
Derelict/abandoned

Paint Creek Bridge (Greene County, Tennessee)
Built 1935; rehabilitated 1980
Lost pony truss bridge over Paint Creek on Paint Creek Road
Replaced by a new bridge

Paint Creek Bridge (Greene County, Tennessee)
Built 1935, replaced 2003
Lost bridge over Paint Creek on Paint Creek Road
Replaced by a new bridge

Palm Valley Bridge (St. Johns County, Florida)
Built 1937, replaced 2003
Lost bascule bridge over Intracoastal Waterway on County Road C210
Replaced by new bridge

Paradise Hill Road Bridge (Hancock County, Maine)
Built 1951
Concrete arch bridge over ME 233 on Paradise Hill Road in Bar Harbor
Open to traffic

Paradise River Bridge (Pierce County, Washington)
Built 1926
Concrete arch bridge over Paradise River on Paradise Connection
Open to traffic

Park Headquarters Bridge (Sevier County, Tennessee)
Built 1937
Three-span concrete arch bridge over West Prong Little Pigeon on New Found Gap Road (U.S. 441). formerly Indian Gap Highway, Great Smoky Mountains National Park, Tennessee
Open to traffic

Park Officials Resident Road Bridge over Fighting Gap Creek (Sevier County, Tennessee)
Built 1938
Concrete tee beam bridge over Fighting Gap Creek on Park Headquarters Road West
Open to traffic

Paulina Creek Bridge (Deschutes County, Oregon)
Built 2007
Bailey pony truss bridge over Paulina Creek on Mckay Camp Access
Open to traffic

Pebble Creek Bridge (Park County, Wyoming)
Built 1934-36
Concrete deck girder bridge over Pebble Creek on Northeast Entrance Road
Open to traffic

Pelican Creek Bridge (Teton County, Wyoming)
Built 1934
Slab bridge over Pelican Creek on East Entrance Road
Open to traffic

Peltier Bridge (Shasta County, California)
Built 1955
Bailey pony truss bridge over Clear Creek on Peltier Valley Rd
Open to traffic

Penstock Bridge (Chelan County, Washington)
Built 1907
Through truss bridge over Wenatchee River on Abandoned pipeline for railroad works
Open to pedestrians

Peters Creek Road Blue Ridge Parkway Bridge (Bedford County, Virginia)
Built 1960
Concrete rigid frame bridge over Peters Creek Road on Blue Ridge Parkway
Open to traffic

Pickwick Dam Bridge (Hardin County, Tennessee)
Built 1963; rehabilitated 1978
Girder bridge over Tennessee River & Plant Road on Co Rd 128
Open to traffic

Pigtail Bridge (Custer County, South Dakota)
Built 1930; Subsequent work 1940; rehabilitated 2007
Steel stringer bridge over SD Route 87 on SD Route 87
Open to traffic

Pike Island Lock and Dam (Ohio County, West Virginia)
Built between 1959 and 1965 to replace Locks & Dams 10 and 11
Bridge over Ohio River
Open to traffic

Pimmit Run Bridge (Fairfax County, Virginia)
Built 1959; rehabilitated 1993
Deck plate girder bridge over Pimmit Run on Gwmp
Open to traffic

Pine Creek Bridge (Washington County, Utah)
Built 1930
Stone arch bridge over Pine Creek on Zion - Mount Carmel Road
Open to traffic

Pine Mountain Tunnel (Buncombe County, North Carolina)
Built ca1930
Tunnel under Pine Mountain on Blue Ridge Parkway
Open to traffic

Pinecrest Road Bridge (Clackamas County, Oregon)
Bridge over Molalla River on BLM Road #06-3E-30
Open to traffic

Pinnacle Ridge Tunnel (Haywood County, North Carolina)
Built ca1930
Tunnel under Mountain on Blue Ridge Parkway
Open to traffic

Pioneer Cabin Tree Tunnel (Calaveras County, California)
Germinated appx 1,000 years ago; Hollowed out in the 1880s; Toppled January 8, 2017
Lost Tunnel under Branches on North Grove Trail
Destroyed by severe weather

Pit River Bridge (Shasta County, California)
Haunched Deck plate girder bridge over Pit River on Fenders Ferry Road (CRN8G01)
Open to traffic

Plant Road K Long Creek Bridge (Des Moines County, Iowa)
Built 1905
Pony truss bridge over Long Creek on Plant Road K
Closed

Plant Road K Spring Creek Bridge (Des Moines County, Iowa)
Built 1910
Pony truss bridge over Spring Creek on Plant Road K
Closed

Platform Bridge (Marin County, California)
Concrete pony arch bridge over Lagunitas Creek on Sir Francis Drake Bikeway
Open to pedestrians only

Plum Creek Bridge (Lyon County, Kansas)
Built 1935; rehabilitated 1966
Pony truss bridge over Plum Creek on Old Highway 57
Open to traffic

Plum Creek Bridge (Lyon County, Kansas)
Built 1927
Concrete tee beam bridge over Plum Creek on Old Highway 57
Open to traffic

Pohono Bridge (Mariposa County, California)
Built 1928
Concrete arch bridge over Merced River on Valley Loop Road
Open to traffic