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Laurel Fork Blue Ridge Parkway Bridge (Ashe County, North Carolina)
Built 1939
Deck plate girder bridge over Laurel Fork on Blue Ridge Parkway
Open to traffic

Lava Canyon Bridge (Skamania County, Washington)
Pony truss bridge over Muddy River on Lava Canyon Trail
Open to pedestrians

Lava Canyon Suspension Bridge (Skamania County, Washington)
Wire suspension bridge over Muddy River on Lava Canyon Trail
Open to pedestrians

Leavitt Meadows Campground Trail Bridge (Mono County, California)
Built between 1933 and 1953; rehabilitated 1953; damaged by flooding 1996
Warren pony truss with all verticals bridge over West Walker Creek on West Walker Trail (#22046)
Open to pedestrians only

Lebo Creek Bridge (Coffey County, Kansas)
Built 1935; rehabilitated 1966
Pony truss bridge over Lebo Creek on 19th Ln
Open to traffic

Lehigh Gorge Crossing (Carbon County, Pennsylvania)
Built Circa 1950, rehibilitated 1975; changed to trail bridge circa 1990
Steel rigid frame bridge over Davis Creek on D&L Lehigh Gorge Trail
Open to pedestrians

Lewis River Bridge (Skamania County, Washington)
Built 1980
Wooden arch bridge over Lewis River
Open to traffic

Lexington Turnpike Blue Ridge Parkway Bridge (Amherst County, Virginia)
Built 1959
Concrete arch bridge over US 60 on the Blue Ridge Parkway
Open to traffic

Liberty Road Bridge (Adams County, Mississippi)
Built 2004
Beam bridge over Liberty Road on Natchez Trace Parkway in Natchez
Open to traffic

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

Lincoln Bridge (Murray County, Oklahoma)
Built 1909
Stone arch bridge over Travertine Creek on Pedestrian path
Open to pedestrians

Lincoln Woods Suspension footbridge (Carroll County, New Hampshire)
Suspension footbridge over East Branch Pemigewasset River on Trail
Open to pedestrians only

Linn Cove Viaduct (Avery County, North Carolina)
Known as the "missing link" of the Blue Ridge Parkway. Built from 1979 to 1982, using 153 precast segments, each weighing 50 tons, assembled one-by-one, using the cantilever method, and epoxyed into place.
Concrete deck girder bridge over Linn Cove Branch and ridge boulder field on the Blue Ridge Parkway
Open to traffic

Linville River Bridge (Avery County, North Carolina)
Built 1940
Concrete arch bridge over Linville River on Blue Ridge Parkway
Open to traffic

Little Creek Bridge (Iron County, Utah)
Built 1960
Timber stringer bridge over Little Creek on Horse Valley Rd
Open to traffic

Little Creek Spillway Bridge (Williamson County, Illinois)
Built 1962
Wooden bridge over Little Creek Spillway on Old Railroad Grade in Marion
Derelict/abandoned and bypassed to the north

Little Glade Creek Blue Ridge Parkway Bridge No. 1 (Alleghany County, North Carolina)
Built 1937
Closed-spandrel arch bridge over Little Glade Creek on Blue Ridge Parkway
Open to traffic

Little Glade Creek Blue Ridge Parkway Bridge No. 2 (Alleghany County, North Carolina)
Built 1937
Tee beam bridge over Little Glade Creek on Blue Ridge Parkway
Open to traffic

Little Glade Creek Blue Ridge Parkway Bridge No. 3 (Alleghany County, North Carolina)
Built 1936
Concrete tee beam bridge over Little Glade Creek on Blue Ridge Parkway
Open to traffic

Little Grassy Lake Spillway Bridge (Williamson County, Illinois)
Built 1939
Steel stringer bridge over Little Grassy Lake Spillway on Grassy Road
Open to traffic

Little Hell Canyon Highway Bridge (Yavapai County, Arizona)
Semi-abandoned Warren deck truss bridge over Little Hell Canyon on US-89 (Abandoned Alignment)
On disused alignment of Highway 89, but still driveable and in local use, though high-clearance vehicle recommended. Not maintained by county; Forest Service ownership is speculative.

Little Hunters Beach Brook Bridge (Hancock County, Maine)
Stone culvert bridge over Hunters Beach Brook Bridge on Park Loop Road
Open to traffic

Little Hunting Creek Bridge (Fairfax County, Virginia)
Built 1932
Concrete arch bridge over Little Hunting Creek on George Washington Memorial Parkway
Unknown status

Little Laurel Road Blue Ridge Parkway Bridge (Watauga County, North Carolina)
Built 1941
Concrete rigid frame bridge over Little Laurel Rd on Blue Ridge Parkway
Open to traffic

Little Lusk Creek Bridge (Pope County, Illinois)
Built 1937; rehabilitated 1970; bypassed 1994
Abandoned timber stringer bridge over Little Lusk Creek on Williams Tower Road (TR 9)
Abandoned next to a modern bridge

Little North Santiam River Bridge (Marion County, Oregon)
Built 1991
Timber through arch bridge over Little North Santiam River on USFS Road 2207
Open to traffic

Little Pisgah Ridge Tunnel (Henderson County, North Carolina)
Built ca1930
Tunnel under Mountain on Blue Ridge Parkway
Open to traffic

Little Saline River Bridge (Pope County, Illinois)
Abandoned pony truss bridge over Little Saline River on abandoned road
Abandoned with deck missing

Little Salmon River Bridge (Idaho County, Idaho)
Built 1949
Concrete tee beam bridge over Little Salmon River on Forest Service Road
Open to traffic

Little Sandy Crossing Bridge (Sweetwater County, Wyoming)
Warren pony truss bridge over Little Sandy Creek on California Mormon Road
Open to traffic

Little Shoal Creek Bridge (Logan County, Arkansas)
Bridge over Little Sugar Creek on Spring Lake Road NFR
Open to traffic

Little Switzerland Tunnel (Mitchell County, North Carolina)
Built ca. 1930
Tunnel under Mountain on Blue Ridge Parkway
Open to traffic

Little West Fork Creek Bridge (Montgomery County, Tennessee)
Built 1950
Through arch bridge over Little West Fork Creek on Mcnair Road
Open to traffic

Lock & Dam 14 (Scott County, Iowa)
Built 1938,
Dam on Mississippi River
Open to boat traffic

Lock & Dam 14 Access Bridge (Scott County, Iowa)
Pratt pony truss bridge over Auxiliary Lock/Mississippi River on Access Road
Open to Corps of Engineers traffic

Lock & Dam 15 Service Bridge (Scott County, Iowa)
Built 1934
Dam Service Road on Mississippi River
Open to Dam Workers

Lock & Dam 16 (Muscatine County, Iowa)
Built 1937
Dam on Mississippi River
Open to boat traffic

Lock Access Road Bridge (Lauderdale County, Alabama)
Built 1926
Bascule bridge over Wilson Auxiliary Lock on Lock Access Road in Florence
Open to traffic for TVA official use only. A bypass bridge is under construction.

Lodge Pole Bridge (Tulare County, California)
Built 1930
Concrete arch bridge over Marble Fork Kaweah River on Generals Highway
Open to traffic

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

Long Creek Bridge (Des Moines County, Iowa)
Built 1910
Pony truss bridge over Long Creek on Yard G Road
Open to military traffic

Long Creek Bridge (Des Moines County, Iowa)
Built 1909
Pony truss bridge over Long Creek on Line 3a Road
Open to military traffic

Longmire Service Road Bridge (Pierce County, Washington)
Built 1923
Suspension bridge over Nisqually River on Longmire Service Road
Open to traffic

Longview Farm Mouse Creek Bridge (Jackson County, Missouri)
Built ca 1910 as part of Longview Farm, innundated ca 1987
Closed-spandrel arch bridge over Mouse Creek on Private road
Inundated

Longview Road Bridge (Jackson County, Missouri)
Built 1920's
Open spandrel arch bridge over Little Blue River on Longview Road
Inundated

Lookout Creek Bridge (Dade County, Georgia)
Warren pony truss with alternating verticals bridge over Lookout Creek on Private Drive
Intact but closed to all traffic. It's on private property. NO TRESPASSING.

Lower Greenville Bridge (Wayne County, Missouri)
Built in 1911 by the Stupp Bros. Bridge & Iron Co. removed in 1931 by S. J. Cohen Construction Co,
Lost Bridge over St. Francis River on State Route 23
No longer exists, displaced lally columns remain along river/lake bank

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

Lower Tenmile Creek Bridge (Tulare County, California)
Built 1954
Deck truss bridge over Lower Tenmile Creek on Road 13S09
Open to traffic

Lumsden Bridge (Tuolumne County, California)
Warren pony truss with all verticals bridge over S. Fork Toulumne River on Lumsden Rd
Open to traffic

LV - Oatka Creek Bridge (Genesee County, New York)
Open-spandrel arch bridge over Oatka Creek on Quarry haul road (former LV Buffalo Line)
Open to road traffic

M&NA Charcoal Gap Tunnel (Carroll County, Arkansas)
Completed March 22, 1901; abandoned in 1961
Partially collapsed tunnel on the former Missouri and North Arkansas Railway, 7 miles northeast of Eureka Springs
Abandoned and partially collapsed

M&STL - Pope Creek Bridge (Mercer County, Illinois)
Built 1901
Abandoned Modified Warren through truss bridge over Pope Creek on Abandoned C&NW Railroad
Derelict/abandoned

Mabry Mill Bridge (Floyd County, Virginia)
Built ca 1937
Concrete rigid frame bridge over Tributary of Laurel Fork on Blue Ridge Parkway
Open to pedestrians only

Madisonville Bridge (Ralls County, Missouri)
Built 1893 by St. Louis Bridge & Iron Co.; relocated to a nearby field in 2005
Through truss bridge formerly over Spencer Creek on Madisonville Road just beyond the end of Route C, but now located in a field just north of its old location
Relocated to a nearby field after being purchases by a local couple. Replaced by new bridge

Maiden Rock Bridge (Beaverhead County, Montana)
Built or relocated here 1951; rehabilitated 1993
Parker through truss bridge over Big Hole River on Maiden Rock Road
Open to traffic

Maloney Circle Bridge (Warren County, Mississippi)
Built 1908
Arch bridge over Illinois Central RR on Maloney Circle in Vicksburg
Open to pedestrians

Manayunk Philadelphia & Reading Railroad Bridge (Washington, District of Columbia)
Built 1845 1/2 Mile East of Flat Rock Tunnel. In service until 1901.
Howe pony truss bridge over Nothing (Exhibit) on Nothing (Exhibit)
One truss line on display as museum exhibit.

Manistee River North Channel Railroad Bridge (Manistee County, Michigan)
Built 1947
Pony/through plate girder bridge over Manistee River on CSX RR
Open to traffic

Manning Crevice Suspension Bridge (Idaho County, Idaho)
Built 1938
Wire suspension bridge over Salmon River on NF 1614
Open to traffic

Marble Creek Bridge (Ripley County, Indiana)
Built ca. 1905, Concrete deck added in 1986.
Stone arch bridge over Marble Creek on G Road
Open to traffic with restricted access

Markland Dam Bridge (Gallatin County, Kentucky)
Built 1978
Girder bridge over Ohio River on KY 1039 and IN 101
Open to traffic

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

Marks Creek Bridge (Crook County, Oregon)
Bailey pony truss bridge over Marks Creek on U.S.F.S. 2610
Open to traffic

Mayberry Creek Blue Ridge Parkway Bridge (Patrick County, Virginia)
Built 1937
Concrete rigid frame bridge over Mayberry Creek on Blue Ridge Parkway
Open to traffic

MC - Cape Cod Canal Railroad Bridge (Barnstable County, Massachusetts)
Built 1935
Through truss vertical lift bridge over Cape Cod Canal on the Mass Coastal Railroad at Buzzards Bay
Open to traffic

McAlpine Locks Bridge (N) (Jefferson County, Kentucky)
Deck plate girder bridge over Ohio River Louisville & Portland Canal on 27th Street
Replaced by a new bridge

McAlpine Locks Bridge (S) (Jefferson County, Kentucky)
Built 1927, Replaced 2006
Pennsylvania through truss bridge over Ohio River Louisville & Portland Canal on 27th street Route 264
Replaced

McCoy's Ferry C&O Canal Arch Bridge (Washington County, Maryland)
Stone arch bridge over McCoy's Ferry Road


Mcdonald Creek Bridge (Flathead County, Montana)
Built 1926
Stone arch bridge over Mcdonald Creek on Going-To-The-Sun R
Open to traffic

McGee Creek Bridge (Hood River County, Oregon)
Built 1952
Wooden Kingpost pony truss bridge over McGee Creek on Lolo Pass Road
Open to traffic

McKillip Ditch Bridge (White County, Indiana)
Unknown, but likely built on a county road and later acquired for private use.
Abandoned pratt pony truss bridge over McKillip Ditch on Field crossing
Abandoned with mostly intact but dilapidated deck

Meacham Creek Bridge (Umatilla County, Oregon)
Built 1955, Replaced 2006
Pratt pony truss bridge over Meacham Creek on Bingham Road in Umatilla
Replaced by a pre-cast concrete slab bridge in 2006

Meadow River Rail Trail - Carnifex Tunnel (Fayette County, West Virginia)
Built 1929; Abandoned 1997; Ad-hoc trail.
Tunnel on Meadow River Rail Trail
Closed due to structural concerns

Meadow River Rail Trail - Koontz Tunnel (Fayette County, West Virginia)
Built 1929
Tunnel on Meadow River Rail Trail
Open to pedestrians only

Meldahl Dam Bridge (Clermont County, Ohio)
Bridge originally carried traffic to a school and 2 houses. Land was purchased by Corps of Engineers and bridge was abandoned in the late 1950's.
Abandoned queenpost pony truss bridge over Bear Creek
Abandoned

Memorial Avenue Bridge (Washington, District of Columbia)
Built 1932; rehabilitated 2001
Concrete arch bridge over GWMP (Southbound) on Memorial Avenue
Open to traffic

Memorial Avenue Bridge (Washington, District of Columbia)
Built 1932
Concrete arch bridge over Potomac River on Memorial Avenue
Open to traffic

Merced River Bridge (Mariposa County, California)
Built 1933
Concrete arch bridge over Merced River on Valley Loop Road
Unknown status

Merced River Bridge (Mariposa County, California)
Built 1929
Concrete arch bridge over Merced River on Happy Isles Loop
Unknown status

MHWA - Willow Creek Arch Bridge (Oneida County, New York)
Closed-spandrel arch bridge over Willow Creek on Mohawk Adirondack and Northern Railroad
Open to traffic

Middle Fork Willamette River Bridge (Lane County, Oregon)
Built 1955
Wooden deck truss bridge over Middle Fork Willamette River on a USFS Road 2127
Open to traffic

Mill Creek Bridge (Jackson County, Illinois)
Abandoned pony truss bridge over Mill Creek on Jacobini Road (Forest Road 377)
Wrecked following a flash flood

Millard Crossing Bridge (Logan County, Arkansas)
This bridge crosses Shoal Creek on north east side of Magazine mountain at the former town of Millard
Timber stringer bridge over Shoal Creek on Forest Service road #1601
Open to traffic

MILW - Maple River Bridge (Blue Earth County, Minnesota)
Built 1897, Relocated Here in 1910
Abandoned pratt through truss bridge over Maple River on Abandoned Milwaukee Road Railroad
Derelict/abandoned, possibly on private property

Mocus Point Suspension Foot / Pack Bridge (Idaho County, Idaho)
Wire suspension bridge over Lochsa River on pedestrian and equestrian pathway
Open to pedestrian and equestrian activity

Moeller road Bridge (Wichita County, Texas)
Abandoned pratt pony truss bridge over China Creek on Moeller Rd
Abandoned

Moenkopi Wash Bridge (Coconino County, Arizona)
Built 1915
Pony truss bridge over Moenkopi Wash on BIA Route N6731
Open to traffic

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

Mt Orab Main Street Bridge (Brown County, Ohio)
Built 1960's
Bridge over Great Lake Creek on W. Main Street
Open to traffic

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 Birdsong Hollow Arch Bridge (Williamson County, Tennessee)
Built 1995 to bridge the gap over the Little South Fork of the Harpeth River and State Highway 96, one of the last segments to be built on the Natchez Trace Parkway
Concrete double-arch segmental bridge on the Natchez Trace Parkway at Birdsong Hollow in Williamson County Tennessee
Open to traffic

Natchez Trace Bridge (Webster County, Mississippi)
Built 1955
Deck arch bridge over Sr 403 on Natchez Trace
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