Lackawanna River Bridge (Lackawanna County, Pennsylvania)
Built 1940
Through truss bridge over Lackawanna River on PA 3013 (Main Street) in Old Forge
Open to traffic

Lackawanna River Bridge (Lackawanna County, Pennsylvania)
Built 1940
Open-spandrel arch bridge over Lackawanna River on Lackawanna Avenue in Scranton
Open to traffic

Lake Road Bridge (Bottineau County, North Dakota)
Built 1940
Wooden bridge over Lake Metigoshe on Lake Road, 10 mi. north and 4 mi. east of Bottineau in Roland Township
Open to traffic

Lance Creek Bridge (Niobrara County, Wyoming)
Built 1940
Wooden bridge over Lance Creek on WY 271
Open to traffic

Largo Drain Bridge (Catron County, New Mexico)
Built 1940
Pony truss bridge over Largo Drain on CR A191
Open to traffic

Lees Creek CR 38 Bridge (Highland County, Ohio)
Built 1940; rehabilitated 1976
Pony truss bridge over Lees Creek on CR 38
Open to traffic

Left Fork Crooked Creek CR 47 Bridge (Pike County, Ohio)
Built 1940; rehabilitated 1988
Pony truss bridge over Left Fork Crooked Creek on CR 47
Open to traffic

Left Fork Crooked Creek CR 47 Bridge (Pike County, Ohio)
Built 1940
Pony truss bridge over Left Fork Crooked Creek on CR 47
Open to traffic

Lenville Road Bridge (Latah County, Idaho)
Built 1940
Wooden bridge over Little Potlatch Creek on Lenville Road
Open to traffic

Leon River Bridge (Comanche County, Texas)
Built 1940; rehabilitated 1995
Pony truss bridge over Leon River on CR 382
Open to traffic

Leon River Bridge (Hamilton County, Texas)
Built 1940; replaced 2005
Lost truss bridge over Leon River on CR 106
No longer exists

Lewis River Bridge (Clark County, Washington)
Built 1940
Through truss bridge over Lewis River on I-5
Open to traffic

Liberty Street Bridge (Portage County, Ohio)
Built 1940; rehabilitated 1978
Pony truss bridge over Eagle Creek on Liberty Street
Open to traffic

Lime Kiln Road Bridge (Dutchess County, New York)
Built 1940
Pony truss bridge over Tenmile River on Lime Kiln Road
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 AuSable River Bridge (Clinton County, New York)
Built 1940
Wooden bridge over Little AuSable River on Calkins Road (CR 40)
Open to traffic

Little Creek Bridge (Searcy County, Arkansas)
Built 1940 by the Works Progress Administration
Concrete slab bridge over Little Creek on CR 55-A
Open to traffic

Little Cypress Creek AR 274 Bridge (Calhoun County, Arkansas)
Built 1940
Wooden stringer bridge over Little Cypress Creek on AR 274
Open to traffic

Little Knife River Bridge (Dunn County, North Dakota)
Built 1940
Wooden bridge over Little Knife River on a county highway, 3 mi. north and 6 mi. west of Manning
Open to traffic

Little Muddy Creek Bridge (Richardson County, Nebraska)
Built 1940
Pony truss bridge over Little Muddy Creek on a county road
Open to traffic

Little Mulberry Creek Bridge (Crawford County, Arkansas)
Built 1940 by the Works Progress Administration
Stringer bridge over Little Mulberry Creek on Old Turner Road (CR 40)
Open to traffic

Little Nishisakawick Creek Bridge (Hunterdon County, New Jersey)
Built 1940
Concrete arch bridge over Little Nishisakawick Creek on CR 610/NJ 12 in Frenchtown
Open to traffic

Little River Bridge (Laurens County, South Carolina)
Built 1940; replaced 2004
Lost concrete arch bridge over Little River on SC 72
No longer exists

Little Scioto River CR 15 Bridge (Scioto County, Ohio)
Built 1940
Through truss bridge over Little Scioto River on CR 15
Open to traffic

Little Scioto River CR 18 Bridge (Scioto County, Ohio)
Built 1940; rehabilitated 1994
Pony truss bridge over Little Scioto River on CR 18
Open to traffic

Little Scioto River CR 221 Bridge (Scioto County, Ohio)
Built 1940; rehabilitated 1998
Pony truss bridge over Little Scioto River on CR 221
Open to traffic

Little Wabash River Bridge (Edwards County, Illinois)
Built 1940
Through truss bridge over Little Wabash River on FAS 800, 0.5 mi. south of Blood
Open to traffic

Little Wood River Bridge (Blaine County, Idaho)
Built 1940; rehabilitated 1991
Wooden bridge over Little Wood River on a city street in Carey
Open to traffic

Lockport Swing Bridge (Lafourche Parish, Louisiana)
Built 1940
Swing bridge over Bayou Lafourche on LA 655 in Lockport
Open to traffic with a weight limit

Lodgepole Creek Bridge (Laramie County, Wyoming)
Built 1940
Wooden bridge over Lodgepole Creek on CR 2-136
Closed to all traffic

Long Lake Bridge (Hamilton County, New York)
Built 1940; rehabilitated 1991
Through truss bridge over Long Lake on NY 30
Open to traffic

Loop Road Bridge (Lancaster County, Pennsylvania)
Built 1940; rehabilitated 1970
Pony truss bridge over Pequea Creek on Loop Road
Open to traffic

Los Verjeles Road Bridge (Yuba County, California)
Built 1940
Concrete arch bridge over South Honcut Creek on Los Verjeles Road in Loma Rica
Open to traffic

Loughridge Road Bridge (Murray County, Georgia)
Built 1940
Tunnel over CR 23 (Loughridge Road) on CSX Railroad
Open to traffic

Lyndeborough Road Bridge (Hillsborough County, New Hampshire)
Built 1940; rehabilitated 2000
Wooden bridge over South Branch Piscataquog River on Lyndeborough Road in New Boston
Open to traffic

Maclay Street Bridge (Dauphin County, Pennsylvania)
Built 1940
Concrete arch bridge over Paxton Creek on Maclay Street in Harrisburg
Open to traffic

Mahanoy Creek Bridge (Northumberland County, Pennsylvania)
Built 1940; rehabilitated 2001
Through truss bridge over Mahanoy Creek on PA 3006
Open to traffic

Main Street Bridge (Cuyahoga County, Ohio)
Built 1940 by the Wilbur Watson & Associates; rehabilitated 1992
Deck truss bridge on OH 2 (Main Street) in Cleveland
Open to traffic

Main Street Bridge (Petroleum County, Montana)
Built 1940
Pony truss bridge over McDonald Creek on Main Street in Winnett
Open to traffic

Malad River Bridge (Box Elder County, Utah)
Built 1940
Wooden bridge over Malad River on a county road in Garland
Open to traffic

Marsh Creek Bridge (Tioga County, Pennsylvania)
Built 1940; rehabilitated 1983
Pony truss bridge over Marsh Creek on PA 287
Open to traffic

Marshall Street Bridge (Mahoning County, Ohio)
Built 1940 by the Bethlehem Steel Co.
Through truss bridge over Mahoning River on Marshall Street
Open to traffic

Matilija Road Bridge (Ventura County, California)
Built 1940
Concrete arch bridge over North Fork Matilija Creek on Matilija Road
Open to traffic

Mayville Drain Bridge (Traill County, North Dakota)
Built 1940; rehabilitated 1968
Wooden bridge over Mayville Drain on a county highway, 2 mi. east and 5 mi. north of Mayville in Lindaas Township
Open to traffic

McCullough Creek CR 45 Bridge (Scioto County, Ohio)
Built 1940; rehabilitated 1993
Pony truss bridge over McCullough Creek on CR 45
Open to traffic

Meadowbrook Road Bridge (Nassau County, New York)
Built 1940; rehabilitated 1956
Concrete arch bridge over Southern State Parkway on Meadowbrook Road in North Merrick
Open to traffic

Memorial Causeway Bridge (Putnam County, Florida)
Built 1940
Concrete arch bridge over St. Johns River Overflow on Memorial Causeway in East Palatka
Open to traffic

Memorial Causeway Bridge (Putnam County, Florida)
Built 1940
Concrete arch bridge over St. Johns River Overflow on Memorial Causeway in East Palatka
Open to traffic

Meramec River MO 21 Bridge (St. Louis County, Missouri)
Built 1940
Steel through arch bridge over the Meramec River on MO 21
Open to four lanes of traffic

Meridian Road Bridge (Marathon County, Wisconsin)
Built 1940
Pony truss bridge over Black Creek on Meridian Road
Open to traffic

Middle Fork CR 4 Bridge (Highland County, Ohio)
Built 1940; rehabilitated 1969
Pony truss bridge over Middle Fork on CR 4
Open to traffic

Middle Tyger River Bridge (Spartanburg County, South Carolina)
Built 1940; rehabilitated 1959
Concrete arch bridge over Middle Tyger River on SC 292 in Lyman
Open to traffic

Milburn Avenue Bridge (Nassau County, New York)
Built 1940
Concrete arch bridge over Southern State Parkway on Milburn Avenue in Uniondale
Open to traffic

Mill Creek Mountain Road Bridge No. 1 (Sebastian County, Arkansas)
Built 1940 by the Works Progress Administration
Concrete slab bridge over an unnamed creek on Mill Creek Mountain Road (CR 67)
Open to traffic

Mill Creek Mountain Road Bridge No. 2 (Sebastian County, Arkansas)
Built 1940 by the Works Progress Administration
Concrete slab bridge over Mill Creek on CR 67
Open to traffic

Mill Street Bridge (Grafton County, New Hampshire)
Built 1940
Wooden bridge over Abandoned NHRR on Mill Street in Haverhill
Open to traffic

Mill Swamp Bridge (Duplin County, North Carolina)
Built 1940; rehabilitated 1967
Wooden bridge over Mill Swamp on NC 1937
Open to traffic

Miller Creek Bridge (St. Louis County, Minnesota)
Built 1940
Concrete arch bridge over Miller Creek on US 53 in Duluth
Open to traffic

Milltown Bridge (Sebastian County, Arkansas)
Built 1940 by the Works Progress Administration
Two-span stone arch bridge over Vache Grasse Creek on CR 77 (Mount Harmony Road) west of Milltown
Current status unknown

Milton Road Bridge (Litchfield County, Connecticut)
Built 1940
Steel arch bridge over Marshepaug River on Milton Road in Goshen
Open to traffic

Milwaukee River Parkway, Lincoln Park, North Branch (Milwaukee County, Wisconsin)
Built 1940
Bridge over North Branch Milwaukee River on Milwaukee River Parkway
Open to traffic

Milwaukee River Parkway, Lincoln Park, South Branch (Milwaukee County, Wisconsin)
Built 1940
Bridge over South Branch Milwaukee River on Milwaukee River Parkway
Open to traffic

Missouri Creek Bridge (Huerfano County, Colorado)
Built 1940
Stringer bridge with stone piers over Missouri Creek on CO 69
Open to traffic

Mohawk River Bridge (Montgomery County, New York)
Built 1940; rehabilitated 1972
Through truss bridge over Mohawk River on NY 10 in Palatine Bridge
Open to traffic

Morgan Lane Bridge (Robertson County, Texas)
Built 1940
Pony truss bridge over Cedar Creek on Morgan Lane
Open to traffic

Moshannon Creek Bridge (Clearfield County, Pennsylvania)
Built 1940; rehabilitated 1971
Pony truss bridge over Moshannon Creek on TR 680 in Chester Hill
Open to traffic

Moss Road Bridge (Blount County, Alabama)
Built 1940
Through truss bridge over Calvert Prong Little War on Moss Road
Open to traffic

Mountville Road Bridge (Lawrence County, Pennsylvania)
Built 1940
Through truss bridge over Slippery Rock Creek on Mountville Road
Open to traffic

Mouse River Bridge (Ward County, North Dakota)
Built 1940
Through truss bridge over Mouse River on a county highway, 2 mi. east of Sawyer in Sawyer Township
Open to traffic

Mt. Baker Ridge Tunnel (King County, Washington)
Built 1940 and twinned in 1989
Pair of tunnels under Mt. Baker Ridge on I-90 in Seattle
Open to traffic

Mud Run CR 26T Bridge (Marion County, Ohio)
Built 1940; rehabilitated 1984
Pony truss bridge over Mud Run on CR 26T
Open to traffic

Muddy Creek Bridge (Nemaha County, Nebraska)
Built 1940
Pony truss bridge over Muddy Creek on FAS 3674
Open to traffic

Muddy Fork CR 80 Bridge (Washington County, Arkansas)
Built ca. 1940 by the Works Progress Administration; replaced 1995
Lost pony truss bridge over Muddy Fork on CR 80
Replaced by a new bridge

Mulberry Fork Bridge (Walker County, Alabama)
Built 1940
Lost through truss bridge over Mulberry Fork Warrior River on Northbound US 78
Replaced by modern bridge

Mulberry Relief Creek Bridge (Franklin County, Arkansas)
Built 1940
Steel stringer bridge over Mulberry Relief Creek on CR 67 - D
Open to traffic

Mustang Creek Bridge (Leon County, Texas)
Built 1940
Pony truss bridge over Mustang Creek on CR 402
Open to traffic

Natchez Bridge (Adams County, Mississippi)
First bridge built 1940; second bridge 1988
Pair of cantilevered through truss bridges over the Mississippi River on US 65 at Natchez
Open to traffic

NC 1629 Bridge (Buncombe County, North Carolina)
Built 1940; rehabilitated 1963
Wooden bridge over an unnamed creek on NC 1629
Open to traffic

NC 197 Bridge (Buncombe County, North Carolina)
Built 1940; rehabilitated 1962
Wooden bridge over an unnamed creek on NC 197
Open to traffic

NE 148th Terrace Bridge (Marion County, Florida)
Built 1940
Steel arch bridge over Creek on NE 148th Terrace
Open to traffic

New Jersey Avenue Bridge (Cumberland County, New Jersey)
Built 1940; rehabilitated 1995
Wooden bridge over Oyster Creek on New Jersey Avenue
Open to traffic

Newtown Creek I-278 Bridge (Kings County, New York)
Built 1940; rehabilitated 1973
Through truss bridge over Newtown Creek on I-278 in New York
Open to traffic

NHRR Bridge (Merrimack County, New Hampshire)
Built 1940
Wooden bridge over Roy Ford Road on abandoned NHRR in Danbury
Open to pedestrians only

Nickeltown Road Bridge (Sebastian County, Arkansas)
Built 1940 by the Works Progress Administration
Stringer bridge over an unnamed creek on Nickeltown Road (CR 37)
Open to traffic

Ninole Stream Bridge (Hawaii County, Hawaii)
Built 1940
Wooden bridge over Ninole Stream on Hawaii Belt Road
Open to traffic

North Branch Little Salmon River Bridge (Oswego County, New York)
Built 1940; rehabilitated 1960
Concrete arch bridge over North Branch Little Salmon River on CR 26 in Parish
Open to traffic

North Fork Bridge (Madison County, Tennessee)
Built 1940
Through truss bridge over North Fork Forked Deer River on NFA 868
Open to traffic

North Fork CR 13 Bridge (Highland County, Ohio)
Built 1940
Truss bridge over North Fork White Oak Creek on CR 13
Open to traffic

North Fork Ivy Creek Bridge (Buncombe County, North Carolina)
Built 1940; rehabilitated 1962
Wooden bridge over North Fork Ivy Creek on NC 197
Open to traffic

North Fork Ivy Creek Bridge (Buncombe County, North Carolina)
Built 1940; rehabilitated 1962
Wooden bridge over North Fork Ivy Creek on NC 197
Open to traffic

North Mineral Creek Bridge (Robertson County, Texas)
Built 1940
Pony truss bridge over North Mineral Creek on CR 384
Open to traffic

North Pack Road Bridge (Hawaii County, Hawaii)
Built 1940
Wooden bridge on North Pack Road in Mountain View
Open to traffic

Oconee River Bridge (Wheeler County, Georgia)
Built 1940
Swing bridge over Oconee River on GA 46
Open to traffic

Oil Creek Bridge (Niobrara County, Wyoming)
Built 1940
Wooden bridge over Oil Creek on WY 271
Open to traffic

Old Cazadero Road Bridge (Sonoma County, California)
Built 1940
Pony truss bridge over Austin Creek on Old Cazadero Road
Open to traffic

Old Mulberry Road Bridge (Hillsborough County, Florida)
Built 1940; rehabilitated 1965
Concrete arch bridge over English Creek on Old Mulberry Road
Open to traffic

Old Rudy Way Bridge (Crawford County, Arkansas)
Built 1940 by the Works Progress Administration
Stringer bridge with stone piers over an unnamed creek on Old Rudy Way (CR 19) just off AR 282 at Rudy
Open to traffic

Oneida River Bridge (Oswego County, New York)
Built 1940; rehabilitated 1991
Through truss bridge over Oneida River on CR 57
Open to traffic

Orchard Bench Road Bridge (Big Horn County, Wyoming)
Built 1940
Wooden bridge over Elk Creek on Orchard Bench Road
Open to traffic

Oshiro Road Bridge (Hawaii County, Hawaii)
Built 1940
Wooden bridge on Oshiro Road
Open to traffic