Currently showing all bridges · Only show bridges with photos
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MAX Blue/Red Lines - Robertson Tunnel (Multnomah County, Oregon)
Built 1998
Tunnel under the West Hills (Tualatin Mountains) on MAX Light Rail Blue Line & Red Line
Open to traffic
MBTA - East Boston Tunnel (Suffolk County, Massachusetts)
Built 1904
Tunnel under Boston Harbor on MBTA Blue Line
Open to traffic
MBTA - Washington St Tunnel - Salem (Essex County, Massachusetts)
built in 1839; extended in 1948-58
Tunnel under downtown Salem- Washington St on MBTA frmr B&M RR
Open to traffic
MC Trail - Meredith Tunnel (Marion County, West Virginia)
Tunnel for Marion County (MC) Rail Trail under Speedway Avenue/Hoult Road/Suncrest Blvd
Open to pedestrians only
McCallie Tunnels (Hamilton County, Tennessee)
First tunnel built 1913, signed as U.S. 11 (1926), signed as U.S. 64 (1931). Second tunnel built 1950
Tunnels under Missionary Ridge on U.S. 11 & 64
Open to traffic
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
Memorial Tunnel (Kanawha County, West Virginia)
Built in 1954 and closed to vehicular traffic in 1987, it is now utilized by the Center For National Response as an anti-terrorism training facility
Tunnel on Old I-64 Old I-77
Intact but closed to all traffic
MGA - Simpson Tunnel (Fayette County, Pennsylvania)
Built 1904; Abandoned ca. 1976; Filled in ?
Lost Tunnel on Monongahela Railroad
Filled in
Mickelson Trail - Tunnel #1 (Pennington County, South Dakota)
Built 1890
Tunnel under Hill on Mickelson Trail
Open to pedestrians only
Mickelson Trail - Tunnel #2 (Pennington County, South Dakota)
Built 1890
Tunnel under Hill on Mickelson Trail
Open to pedestrians only
Mickelson Trail - Tunnel #3 (Pennington County, South Dakota)
Built 1890
Tunnel under Hill on Mickelson Trail
Open to pedestrians only
Mickelson Trail - Tunnel #4 (Pennington County, South Dakota)
Built 1890
Tunnel under hillside on Mickelson Trail
Open to pedestrians only
Middle Matilija Tunnel (Ventura County, California)
Built 1931
Middle Matilija Tunnel on State Route 33
Open to traffic
Middle Tunnel (Oconee County, South Carolina)
Built 1953
Abandoned tunnel
Derelict/abandoned - Majority of tunnel was filled in in the early 1900s
Midland Tunnel No. 1 (Chaffee County, Colorado)
Built 1887 by the Colorado Midland Railroad
First of four tunnels on CR 371 north of Buena Vista
Open to one-lane traffic
Midland Tunnel No. 2 (Chaffee County, Colorado)
Built 1887 by the Colorado Midland Railroad
Second of four tunnels on CR 371 north of Buena Vista
Open to one-lane traffic
Midland Tunnel No. 3 (Chaffee County, Colorado)
Built 1887 by the Colorado Midland Railroad
Third of four tunnels on CR 371 north of Buena Vista
Open to one-lane traffic
Midland Tunnel No. 4 (Chaffee County, Colorado)
Built 1887 by the Colorado Midland Railroad
Fourth of four tunnels on CR 371 north of Buena Vista
Open to one-lane traffic
MILW - Amphitheatre Tunnel (Chouteau County, Montana)
Built 1913
Abandoned tunnel on former Milwaukee Road Railway
Derelict/abandoned and partially collapsed
MILW - Beavertail Tunnel (Missoula County, Montana)
Built 1908
Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railroad
Derelict/abandoned
MILW - Belt Creek Tunnel (Chouteau County, Montana)
Built 1913
Abandoned tunnel on former Milwaukee Road Railway
Derelict/abandoned
MILW - Bonner Tunnel (Missoula County, Montana)
Built 1909
Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railroad
Derelict/abandoned
MILW - Cyr Tunnel (Mineral County, Montana)
Built ca. 1908
Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railroad
Derelict/abandoned
MILW - Eagle's Nest Tunnel (Gallatin County, Montana)
Tunnel on Francis Road (Formerly Milwaukee Road)
Open to private traffic only.
MILW - Fish Creek Tunnel (Jefferson County, Montana)
Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railroad
Abandoned
MILW - Garrison Tunnel (Powell County, Montana)
Built 1908
Abandoned tunnel on Railroad (MILW)
Abandoned
MILW - Lawton Tunnel (Vernon County, Wisconsin)
Built 1897; Abandoned in 1938; Filled in ca. 1982
Lost Tunnel on Railroad
Filled in
MILW - Lombard Tunnel (Broadwater County, Montana)
Abandoned tunnel on Abandoned Chicago, Milwaukee, St. Paul & Pacific Railroad
Abandoned
MILW - Nimrod Tunnel (Granite County, Montana)
Built 1908, abandoned 1980
Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railway
Derelict/abandoned
MILW - Ninemile Tunnel (Missoula County, Montana)
Built ca. 1908
Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railroad
Derelict/abandoned
MILW - Pipestone Pass Tunnel (Silver Bow County, Montana)
Built 1908; line abandoned 1980
Abandoned tunnel under Pipestone Pass on Chicago, Milwaukee, St. Paul & Pacific Railroad
Derelict/abandoned
MILW - Red Coulee Tunnel (Cascade County, Montana)
Built 1914
Abandoned tunnel on Former Milwaukee Road Railway
Derelict/abandoned
Milwaukee Road Boyslton Tunnel (Kittitas County, Washington)
Tunnel on Abandoned Milwaukee Road
Open to pedestrians only
Milwaukee Trail - Blacktail Tunnel #2 (Silver Bow County, Montana)
Built 1908
Abandoned tunnel on Railroad (MILW)
Abandoned
Mitchell Point Tunnel (Hood River County, Oregon)
Built 1915 back filled 1954 blasted away 1966
Lost Tunnel under tunnels though Mitchell point on Former route US 30
Demolished
MNA - Cotter Tunnel (Marion County, Arkansas)
Built 1903-04
Tunnel on the MNA Railroad (formerly Missouri Pacific) just northwest of Cotter
Open to railroad traffic
MNA - Crest Tunnel (Boone County, Arkansas)
Built 1903-05
Tunnel on the Missouri and Northern Arkansas (formerly Missouri Pacific) Railway northwest of Omaha
Open to railroad traffic
MNA - Cricket Tunnel (Boone County, Arkansas)
Built 1903-05
Tunnel on the Missouri and Northern Arkansas (formerly Missouri Pacific) just south of Omaha
Open to railroad traffic
MNA - Pyatt Tunnel (Marion County, Arkansas)
Built 1903-04
Tunnel on the Missouri and Northern Arkansas Railroad (formerly Missouri Pacific) southeast of Pyatt
Open to railroad traffic
MNA - Reeds Spring Tunnel (Stone County, Missouri)
Tunnel on the MNA Railroad just southeast of Reeds Spring
Open to railroad traffic
MNCW - Anthony's Nose Tunnel (Westchester County, New York)
Tunnel under hillside and Bear Mt Bridge on Metro North Railroad
Open to traffic
MNCW - Breakneck Ridge Tunnels (Dutchess County, New York)
Tunnel under Breakneck Ridge on Metro-North Commuter Railroad
Open to traffic
MNCW - Garrison Tunnel (Putnam County, New York)
Tunnel on Metro-North Hudson Line West Track
Open to traffic
MNCW - Oscawana Tunnel (Westchester County, New York)
Tunnel on Metro-North Commuter Railroad
Open to traffic
MNCW - Otisville Tunnel (Orange County, New York)
Built 1908 by Erie Railroad
Tunnel on Metro-North Railroad
Open to traffic
Monitor-Merrimac Memorial Bridge-Tunnel (Suffolk, Virginia)
Built 1992
Tunnel under Hampton Roads on I-664
Open to traffic
Montgomery Bell Tunnel (Cheatham County, Tennessee)
Built 1819
Tunnel under hillside on Tributary of the Harpeth River
Montour Trail - Greer Tunnel (Allegheny County, Pennsylvania)
Tunnel under hill and Hidden Valley Road on Mountour Trail -frmr Montour RR
Open to pedestrians only
Montour Trail - National Tunnel (Allegheny County, Pennsylvania)
Tunnel under hill and Klinger road on Montour Trail - frmr Montour RR
Open to pedestrians only
Moonville Rail Trail - Kings Hollow Tunnel (Athens County, Ohio)
Built 1855
Abandoned tunnel on former CSX(B&O) line
Derelict/abandoned
Moonville Rail Trail - Moonville Tunnel (Vinton County, Ohio)
Built 1857 and abandoned in 1989
Abandoned tunnel with approach that crosses Raccoon Creek on CSX line between Cumberland, Maryland and Cincinnati
Abandoned, but used by pedestrians
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
Mosier Twin Tunnels (Wasco County, Oregon)
Built 1920, Closed due to rock fall problems 1953, Reopened to public in 2000
Tunnel under Mosier Tunnel on Historical Columbia River Highway Trail
Open to pedestrians
Mount Baldy Tunnel #2 (Los Angeles County, California)
Built 1954
Tunnel under hillside on Mount Baldy Road
Open to traffic
MP - East Barretts Tunnel (St. Louis County, Missouri)
Built 1851-1853; Abandoned 1944
Lost Tunnel on Missouri Pacific Railroad
Tunnel demolished in 2000's
MP - Glenallen Tunnel (Bollinger County, Missouri)
Completed August 14, 1869; Final train through in April 1973; Abandoned 1974
Abandoned railroad tunnel north of Glenallen on the Belmont Branch, Missouri Pacific
Abandoned and inaccessible on private land
MP - West Barretts Tunnel (St. Louis County, Missouri)
Built between 1851-53 by the Pacific (later MO Pacific) Railroad for a single broad gauge track; Gauge standardized in 1869. Tunnel remained in service until congestion caused the railroad to bypass the tracks via a cut 100' to the south in 1944.
Tunnel under a hill in Keyes Summit, Missouri on former Missouri Pacific Railroad
Abandoned
MPA - Sisson Street Tunnel (Baltimore, Maryland)
Lost Tunnel under Maryland & Pennsylvania RR on Sisson Street
Removed but not replaced
MRL - Bonita Tunnel (Missoula County, Montana)
Built 1882, widened 1909
Tunnel on Montana Rail Link
Open to traffic
MRL - Bozeman Tunnel (Gallatin County, Montana)
Built 1945 to replace earlier 1884 tunnel
Tunnel under Bozeman Pass on Montana Rail Link
Open to traffic
MRL - Garrison Tunnel (Powell County, Montana)
Built 1882, widened 1909
Tunnel on Montana Rail Link
Open to traffic
MRL - Mullan Tunnel (Lewis and Clark County, Montana)
Built 1883, enlarged and shortened 2009-10
Bridge over Mullan Pass/Continental Divide on Montana Rail Link
Open to traffic
MRL - Nimrod Tunnel (Granite County, Montana)
Built 1882, widened 1909
Tunnel on Montana Rail Link
Open to traffic
Mueller Tunnel (Los Angeles County, California)
Built 1942
Tunnel under hillside on Mount Lowe Road
Open to pedestrians only
MUNI - Sunset Tunnel (San Francisco County, California)
Built 1928
Tunnel under Buena Vista Park on SF Muni
Open to traffic
MUNI - Twin Peaks Tunnel (San Francisco County, California)
Built 1918
Tunnel on San Francisco Municipal Railway
Open to traffic
N&W - Hollins Mill Tunnel (Lynchburg, Virginia)
Built ca1850-rough cut tunnel; abandoned 1982
Tunnel under Hillside on James River Heritage Trail
Open to pedestrians only
Nada Tunnel (Powell County, Kentucky)
Was constructed to haul logs via narrow gauge railroad from timber operations in the Gorge. Construction began in December 1910 and was completed in September 1911. Rock and dirt were removed by dynamite, steam drills and hand tools
Tunnel on KY 77
Open to traffic
National Road Bikeway - Tunnel (Belmont County, Ohio)
Built 1902, Rehabbed 1949 and 2009
Tunnel under US 40 on National Road Bikeway (formerly B&O RR)
Open to traffic
NECR - Bellows Falls Tunnel (Windham County, Vermont)
Built 1851; Floor lowered 1897, 1977, & 2007
Tunnel under Bridge St on New England Central Railroad
Open to traffic
NECR - Burlington Tunnel (Chittenden County, Vermont)
Built 1860-1861, shotcrete lining applied 2008
Tunnel under North Avenue on New England Central Railroad
Open to traffic
NECR - Norwich Tunnel (New London County, Connecticut)
Tunnel under Sherman Street on New England Central Railroad in Norwich
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
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Tunnel
View Exhibit mapMAX Blue/Red Lines - Robertson Tunnel (Multnomah County, Oregon)Built 1998
Tunnel under the West Hills (Tualatin Mountains) on MAX Light Rail Blue Line & Red Line
Open to traffic
MBTA - East Boston Tunnel (Suffolk County, Massachusetts)Built 1904
Tunnel under Boston Harbor on MBTA Blue Line
Open to traffic
MBTA - Washington St Tunnel - Salem (Essex County, Massachusetts)built in 1839; extended in 1948-58
Tunnel under downtown Salem- Washington St on MBTA frmr B&M RR
Open to traffic
MC Trail - Meredith Tunnel (Marion County, West Virginia)Tunnel for Marion County (MC) Rail Trail under Speedway Avenue/Hoult Road/Suncrest Blvd
Open to pedestrians only
McCallie Tunnels (Hamilton County, Tennessee)First tunnel built 1913, signed as U.S. 11 (1926), signed as U.S. 64 (1931). Second tunnel built 1950
Tunnels under Missionary Ridge on U.S. 11 & 64
Open to traffic
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
Built 1929
Tunnel on Meadow River Rail Trail
Open to pedestrians only
Memorial Drive Land Bridge (Harris County, Texas)
Built in 2022 as part of Memorial Park 10 Year Master Plan
Tunnel under Memorial Drive
Open
Built in 2022 as part of Memorial Park 10 Year Master Plan
Tunnel under Memorial Drive
Open
Memorial Tunnel (Kanawha County, West Virginia)Built in 1954 and closed to vehicular traffic in 1987, it is now utilized by the Center For National Response as an anti-terrorism training facility
Tunnel on Old I-64 Old I-77
Intact but closed to all traffic
MGA - Brownsville Tunnel (Fayette County, Pennsylvania)
Built 1904
Tunnel under PA 4003 on Monongahela Railroad
Filled in
Built 1904
Tunnel under PA 4003 on Monongahela Railroad
Filled in
MGA - Simpson Tunnel (Fayette County, Pennsylvania)Built 1904; Abandoned ca. 1976; Filled in ?
Lost Tunnel on Monongahela Railroad
Filled in
Mickelson Trail - Tunnel #1 (Pennington County, South Dakota)Built 1890
Tunnel under Hill on Mickelson Trail
Open to pedestrians only
Mickelson Trail - Tunnel #2 (Pennington County, South Dakota)Built 1890
Tunnel under Hill on Mickelson Trail
Open to pedestrians only
Mickelson Trail - Tunnel #3 (Pennington County, South Dakota)Built 1890
Tunnel under Hill on Mickelson Trail
Open to pedestrians only
Mickelson Trail - Tunnel #4 (Pennington County, South Dakota)
Built 1890
Tunnel under Hill on Mickelson Trail
Open to pedestrians only
Built 1890
Tunnel under Hill on Mickelson Trail
Open to pedestrians only
Mickelson Trail - Tunnel #4 (Pennington County, South Dakota)Built 1890
Tunnel under hillside on Mickelson Trail
Open to pedestrians only
Middle Matilija Tunnel (Ventura County, California)Built 1931
Middle Matilija Tunnel on State Route 33
Open to traffic
Middle Tunnel (Oconee County, South Carolina)Built 1953
Abandoned tunnel
Derelict/abandoned - Majority of tunnel was filled in in the early 1900s
Midland Tunnel No. 1 (Chaffee County, Colorado)Built 1887 by the Colorado Midland Railroad
First of four tunnels on CR 371 north of Buena Vista
Open to one-lane traffic
Midland Tunnel No. 2 (Chaffee County, Colorado)Built 1887 by the Colorado Midland Railroad
Second of four tunnels on CR 371 north of Buena Vista
Open to one-lane traffic
Midland Tunnel No. 3 (Chaffee County, Colorado)Built 1887 by the Colorado Midland Railroad
Third of four tunnels on CR 371 north of Buena Vista
Open to one-lane traffic
Midland Tunnel No. 4 (Chaffee County, Colorado)Built 1887 by the Colorado Midland Railroad
Fourth of four tunnels on CR 371 north of Buena Vista
Open to one-lane traffic
MILW - Amphitheatre Tunnel (Chouteau County, Montana)Built 1913
Abandoned tunnel on former Milwaukee Road Railway
Derelict/abandoned and partially collapsed
MILW - Arrow Creek Tunnel (Judith Basin County, Montana)
Built 1913; Daylighted 1961
Lost Tunnel under Hill on Chicago, Milwaukee St. Paul & Pacific Railway
Removed but not replaced
Built 1913; Daylighted 1961
Lost Tunnel under Hill on Chicago, Milwaukee St. Paul & Pacific Railway
Removed but not replaced
MILW - Beavertail Tunnel (Missoula County, Montana)Built 1908
Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railroad
Derelict/abandoned
MILW - Belt Creek Tunnel (Chouteau County, Montana)Built 1913
Abandoned tunnel on former Milwaukee Road Railway
Derelict/abandoned
MILW - Bonner Tunnel (Missoula County, Montana)Built 1909
Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railroad
Derelict/abandoned
MILW - Canyon Tunnel (Gallatin County, Montana)
Tunnel on Francis Road (Chicago, Milwaukee, St. Paul & Pacific Railroad)
Open to traffic
Tunnel on Francis Road (Chicago, Milwaukee, St. Paul & Pacific Railroad)
Open to traffic
MILW - Cyr Tunnel (Mineral County, Montana)Built ca. 1908
Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railroad
Derelict/abandoned
MILW - Eagle's Nest Tunnel (Gallatin County, Montana)Tunnel on Francis Road (Formerly Milwaukee Road)
Open to private traffic only.
MILW - Fish Creek Tunnel (Jefferson County, Montana)Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railroad
Abandoned
MILW - Garrison Tunnel (Powell County, Montana)Built 1908
Abandoned tunnel on Railroad (MILW)
Abandoned
MILW - Lacey Tunnel (Chouteau County, Montana)
Built 1913
Tunnel under Hill on Abandoned Chicago, Milwaukee St. Paul & Pacific Railway
Intact but closed to all traffic
Built 1913
Tunnel under Hill on Abandoned Chicago, Milwaukee St. Paul & Pacific Railway
Intact but closed to all traffic
MILW - Lawton Tunnel (Vernon County, Wisconsin)Built 1897; Abandoned in 1938; Filled in ca. 1982
Lost Tunnel on Railroad
Filled in
MILW - Lombard Tunnel (Broadwater County, Montana)Abandoned tunnel on Abandoned Chicago, Milwaukee, St. Paul & Pacific Railroad
Abandoned
MILW - Nimrod Tunnel (Granite County, Montana)Built 1908, abandoned 1980
Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railway
Derelict/abandoned
MILW - Ninemile Tunnel (Missoula County, Montana)Built ca. 1908
Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railroad
Derelict/abandoned
MILW - Pipestone Pass Tunnel (Silver Bow County, Montana)Built 1908; line abandoned 1980
Abandoned tunnel under Pipestone Pass on Chicago, Milwaukee, St. Paul & Pacific Railroad
Derelict/abandoned
MILW - Red Coulee Tunnel (Cascade County, Montana)Built 1914
Abandoned tunnel on Former Milwaukee Road Railway
Derelict/abandoned
MILW - Small Creek Tunnel #1 (Shoshone County, Idaho)
Built 1909
Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railroad
Derelict/abandoned & collapsing
Built 1909
Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railroad
Derelict/abandoned & collapsing
MILW - Tunnel No. 6 (Gallatin County, Montana)
Built ca. 1908
Tunnel on 16 Mile Road (Former MILW Pacific Extension)
Open to traffic
Built ca. 1908
Tunnel on 16 Mile Road (Former MILW Pacific Extension)
Open to traffic
MILW - Tunnel No. 7 (Gallatin County, Montana)
Built ca. 1908
Tunnel on 16 Mile Road (Former MILW Pacific Extension)
Open to traffic
Built ca. 1908
Tunnel on 16 Mile Road (Former MILW Pacific Extension)
Open to traffic
MILW - Tunnel No. 8 (Gallatin County, Montana)
Built ca. 1908
Tunnel on 16 Mile Road (Former MILW Pacific Extension)
Open to traffic
Built ca. 1908
Tunnel on 16 Mile Road (Former MILW Pacific Extension)
Open to traffic
Milwaukee Road Boyslton Tunnel (Kittitas County, Washington)Tunnel on Abandoned Milwaukee Road
Open to pedestrians only
Milwaukee Trail - Blacktail Tunnel #1 (Silver Bow County, Montana)
Built 1908
Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railroad
Derelict/abandoned
Built 1908
Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific Railroad
Derelict/abandoned
Milwaukee Trail - Blacktail Tunnel #2 (Silver Bow County, Montana)Built 1908
Abandoned tunnel on Railroad (MILW)
Abandoned
Minnehaha Tunnel (Hennepin County, Minnesota)
Built 1999
Tunnel under MN 55 on Minnehaha Parkway
Open to traffic
Built 1999
Tunnel under MN 55 on Minnehaha Parkway
Open to traffic
Mitchell Point Tunnel (Hood River County, Oregon)Built 1915 back filled 1954 blasted away 1966
Lost Tunnel under tunnels though Mitchell point on Former route US 30
Demolished
MNA - Cotter Tunnel (Marion County, Arkansas)Built 1903-04
Tunnel on the MNA Railroad (formerly Missouri Pacific) just northwest of Cotter
Open to railroad traffic
MNA - Crest Tunnel (Boone County, Arkansas)Built 1903-05
Tunnel on the Missouri and Northern Arkansas (formerly Missouri Pacific) Railway northwest of Omaha
Open to railroad traffic
MNA - Cricket Tunnel (Boone County, Arkansas)Built 1903-05
Tunnel on the Missouri and Northern Arkansas (formerly Missouri Pacific) just south of Omaha
Open to railroad traffic
MNA - Pyatt Tunnel (Marion County, Arkansas)Built 1903-04
Tunnel on the Missouri and Northern Arkansas Railroad (formerly Missouri Pacific) southeast of Pyatt
Open to railroad traffic
MNA - Reeds Spring Tunnel (Stone County, Missouri)Tunnel on the MNA Railroad just southeast of Reeds Spring
Open to railroad traffic
MNCW - Anthony's Nose Tunnel (Westchester County, New York)Tunnel under hillside and Bear Mt Bridge on Metro North Railroad
Open to traffic
MNCW - Breakneck Ridge Tunnels (Dutchess County, New York)Tunnel under Breakneck Ridge on Metro-North Commuter Railroad
Open to traffic
MNCW - Garrison Tunnel (Putnam County, New York)Tunnel on Metro-North Hudson Line West Track
Open to traffic
MNCW - Oscawana Tunnel (Westchester County, New York)Tunnel on Metro-North Commuter Railroad
Open to traffic
MNCW - Otisville Tunnel (Orange County, New York)Built 1908 by Erie Railroad
Tunnel on Metro-North Railroad
Open to traffic
Monitor-Merrimac Memorial Bridge-Tunnel (Suffolk, Virginia)Built 1992
Tunnel under Hampton Roads on I-664
Open to traffic
Monitor-Merrimack Memorial Bridge-Tunnel (Portsmouth, Virginia)
Built 1990, opened 1992
2 Bridge-Tunnels under James River on Interstate 664
Open to traffic
Built 1990, opened 1992
2 Bridge-Tunnels under James River on Interstate 664
Open to traffic
Montgomery Bell Tunnel (Cheatham County, Tennessee)Built 1819
Tunnel under hillside on Tributary of the Harpeth River
Montour Trail - Greer Tunnel (Allegheny County, Pennsylvania)Tunnel under hill and Hidden Valley Road on Mountour Trail -frmr Montour RR
Open to pedestrians only
Montour Trail - National Tunnel (Allegheny County, Pennsylvania)Tunnel under hill and Klinger road on Montour Trail - frmr Montour RR
Open to pedestrians only
Moonville Rail Trail - Kings Hollow Tunnel (Athens County, Ohio)Built 1855
Abandoned tunnel on former CSX(B&O) line
Derelict/abandoned
Moonville Rail Trail - Moonville Tunnel (Vinton County, Ohio)Built 1857 and abandoned in 1989
Abandoned tunnel with approach that crosses Raccoon Creek on CSX line between Cumberland, Maryland and Cincinnati
Abandoned, but used by pedestrians
Moreau Tunnel (Cole County, Missouri)
Abandoned 1923
Abandoned tunnel on Missouri Pacific Railroad
Derelict/abandoned
Abandoned 1923
Abandoned tunnel on Missouri Pacific Railroad
Derelict/abandoned
Morenci Southern - Tunnel #1 (Greenlee County, Arizona)
Built 1902; Abandoned 1922
Abandoned tunnel on Morenci Southern Railroad
Derelict/abandoned
Built 1902; Abandoned 1922
Abandoned tunnel on Morenci Southern Railroad
Derelict/abandoned
Morenci Southern - Tunnel #2 (Greenlee County, Arizona)
Built 1902; Abandoned 1922
Abandoned tunnel on Morenci Southern Railroad
Derelict/abandoned
Built 1902; Abandoned 1922
Abandoned tunnel on Morenci Southern Railroad
Derelict/abandoned
Morenci Southern - Tunnel #3 (Greenlee County, Arizona)
Built 1902; Abandoned 1922
Abandoned tunnel on Morenci Southern Railroad
Derelict/abandoned
Built 1902; Abandoned 1922
Abandoned tunnel on Morenci Southern Railroad
Derelict/abandoned
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
Mosier Twin Tunnels (Wasco County, Oregon)Built 1920, Closed due to rock fall problems 1953, Reopened to public in 2000
Tunnel under Mosier Tunnel on Historical Columbia River Highway Trail
Open to pedestrians
Mount Baldy Tunnel #2 (Los Angeles County, California)Built 1954
Tunnel under hillside on Mount Baldy Road
Open to traffic
MP - East Barretts Tunnel (St. Louis County, Missouri)Built 1851-1853; Abandoned 1944
Lost Tunnel on Missouri Pacific Railroad
Tunnel demolished in 2000's
MP - Glenallen Tunnel (Bollinger County, Missouri)Completed August 14, 1869; Final train through in April 1973; Abandoned 1974
Abandoned railroad tunnel north of Glenallen on the Belmont Branch, Missouri Pacific
Abandoned and inaccessible on private land
MP - Vineland Tunnel (Jefferson County, Missouri)
Tunnel completed ca. 1858; tunnel removed by "daylighting" in the 1940s
Lost tunnel under a ridge on the former Missouri Pacific Railroad
Tunnel converted into rock cut
Tunnel completed ca. 1858; tunnel removed by "daylighting" in the 1940s
Lost tunnel under a ridge on the former Missouri Pacific Railroad
Tunnel converted into rock cut
MP - West Barretts Tunnel (St. Louis County, Missouri)Built between 1851-53 by the Pacific (later MO Pacific) Railroad for a single broad gauge track; Gauge standardized in 1869. Tunnel remained in service until congestion caused the railroad to bypass the tracks via a cut 100' to the south in 1944.
Tunnel under a hill in Keyes Summit, Missouri on former Missouri Pacific Railroad
Abandoned
MPA - Sisson Street Tunnel (Baltimore, Maryland)Lost Tunnel under Maryland & Pennsylvania RR on Sisson Street
Removed but not replaced
MRL - Bonita Tunnel (Missoula County, Montana)Built 1882, widened 1909
Tunnel on Montana Rail Link
Open to traffic
MRL - Bozeman Tunnel (Gallatin County, Montana)Built 1945 to replace earlier 1884 tunnel
Tunnel under Bozeman Pass on Montana Rail Link
Open to traffic
MRL - Garrison Tunnel (Powell County, Montana)Built 1882, widened 1909
Tunnel on Montana Rail Link
Open to traffic
MRL - John Tunnel (Sanders County, Montana)
Tunnel under hillside on Montana Rail Link
Open to traffic
Tunnel under hillside on Montana Rail Link
Open to traffic
MRL - Mullan Tunnel (Lewis and Clark County, Montana)Built 1883, enlarged and shortened 2009-10
Bridge over Mullan Pass/Continental Divide on Montana Rail Link
Open to traffic
MRL - Nimrod Tunnel (Granite County, Montana)Built 1882, widened 1909
Tunnel on Montana Rail Link
Open to traffic
Mueller Tunnel (Los Angeles County, California)Built 1942
Tunnel under hillside on Mount Lowe Road
Open to pedestrians only
MUNI - Sunset Tunnel (San Francisco County, California)Built 1928
Tunnel under Buena Vista Park on SF Muni
Open to traffic
MUNI - Twin Peaks Tunnel (San Francisco County, California)Built 1918
Tunnel on San Francisco Municipal Railway
Open to traffic
N&W - Hollins Mill Tunnel (Lynchburg, Virginia)Built ca1850-rough cut tunnel; abandoned 1982
Tunnel under Hillside on James River Heritage Trail
Open to pedestrians only
N. Airport Drive Tunnel (Erie County, New York)
Tunnel under Buffalo Niagara International Airport runway on N. Airport Drive
Tunnel under Buffalo Niagara International Airport runway on N. Airport Drive
Nada Tunnel (Powell County, Kentucky)Was constructed to haul logs via narrow gauge railroad from timber operations in the Gorge. Construction began in December 1910 and was completed in September 1911. Rock and dirt were removed by dynamite, steam drills and hand tools
Tunnel on KY 77
Open to traffic
National Road Bikeway - Tunnel (Belmont County, Ohio)Built 1902, Rehabbed 1949 and 2009
Tunnel under US 40 on National Road Bikeway (formerly B&O RR)
Open to traffic
NECR - Bellows Falls Tunnel (Windham County, Vermont)Built 1851; Floor lowered 1897, 1977, & 2007
Tunnel under Bridge St on New England Central Railroad
Open to traffic
NECR - Burlington Tunnel (Chittenden County, Vermont)Built 1860-1861, shotcrete lining applied 2008
Tunnel under North Avenue on New England Central Railroad
Open to traffic
NECR - Norwich Tunnel (New London County, Connecticut)Tunnel under Sherman Street on New England Central Railroad in Norwich
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
Negro Mountain Tunnel (Somerset County, Pennsylvania)
Tunnel for Railroad Grade (never used)
Intact but closed to all traffic
Tunnel for Railroad Grade (never used)
Intact but closed to all traffic
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