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Tunnel
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MBTA - East Boston Tunnel (Suffolk County, Massachusetts)
Built 1904Tunnel under Boston Harbor on MBTA Blue LineOpen to traffic
MBTA - Washington St Tunnel - Salem (Essex County, Massachusetts)
built in 1839; extended in 1948-58Tunnel under downtown Salem- Washington St on MBTA frmr B&M RROpen to traffic
MC Trail - Meredith Tunnel (Marion County, West Virginia)
Tunnel for Marion County (MC) Rail Trail under Speedway Avenue/Hoult Road/Suncrest BlvdOpen 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 1950Tunnels under Missionary Ridge on U.S. 11 & 64Open to traffic
Memorial Drive Land Bridge (Harris County, Texas)
Built in 2022 as part of Memorial Park 10 Year Master PlanTunnel 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 facilityTunnel on Old I-64 Old I-77Intact but closed to all traffic
MGA - Simpson Tunnel (Fayette County, Pennsylvania)
Built 1904; Abandoned ca. 1976; Filled in ?Lost Tunnel on Monongahela RailroadFilled in
Mickelson Trail - Tunnel #4 (Pennington County, South Dakota)
Built 1890Tunnel under hillside on Mickelson TrailOpen to pedestrians only
Middle Matilija Tunnel (Ventura County, California)
Built 1931Middle Matilija Tunnel on State Route 33Open to traffic
Middle Tunnel (Oconee County, South Carolina)
Built 1953Abandoned tunnelDerelict/abandoned - Majority of tunnel was filled in in the early 1900s
Midland Tunnel No. 1 (Chaffee County, Colorado)
Built 1887 by the Colorado Midland RailroadFirst of four tunnels on CR 371 north of Buena VistaOpen to one-lane traffic
Midland Tunnel No. 2 (Chaffee County, Colorado)
Built 1887 by the Colorado Midland RailroadSecond of four tunnels on CR 371 north of Buena VistaOpen to one-lane traffic
Midland Tunnel No. 3 (Chaffee County, Colorado)
Built 1887 by the Colorado Midland RailroadThird of four tunnels on CR 371 north of Buena VistaOpen to one-lane traffic
Midland Tunnel No. 4 (Chaffee County, Colorado)
Built 1887 by the Colorado Midland RailroadFourth of four tunnels on CR 371 north of Buena VistaOpen to one-lane traffic
Midtown Tunnel (Portsmouth, Virginia)
Built 1962Tunnel under Elizabeth River on US-58Open to traffic
Mill Street Tunnel (Pendleton County, Kentucky)
Tunnel under CSX rail line in ButlerOpen to traffic
MILW - Amphitheatre Tunnel (Chouteau County, Montana)
Built 1913Abandoned tunnel on former Milwaukee Road RailwayDerelict/abandoned and partially collapsed
MILW - Arrow Creek Tunnel (Judith Basin County, Montana)
Built 1913; Daylighted 1961Lost Tunnel under Hill on Chicago, Milwaukee St. Paul & Pacific RailwayRemoved but not replaced
MILW - Beavertail Tunnel (Missoula County, Montana)
Built 1908Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific RailroadDerelict/abandoned
MILW - Belt Creek Tunnel (Chouteau County, Montana)
Built 1913Abandoned tunnel on former Milwaukee Road RailwayDerelict/abandoned
MILW - Bonner Tunnel (Missoula County, Montana)
Built 1909Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific RailroadDerelict/abandoned
MILW - Canyon Tunnel (Gallatin County, Montana)
Tunnel on Francis Road (Chicago, Milwaukee, St. Paul & Pacific Railroad)Open to traffic
MILW - Cyr Tunnel (Mineral County, Montana)
Built ca. 1908Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific RailroadDerelict/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 RailroadAbandoned
MILW - Lacey Tunnel (Chouteau County, Montana)
Built 1913Tunnel under Hill on Abandoned Chicago, Milwaukee St. Paul & Pacific RailwayIntact but closed to all traffic
MILW - Lawton Tunnel (Vernon County, Wisconsin)
Built 1897; Abandoned in 1938; Filled in ca. 1982Lost Tunnel on RailroadFilled in
MILW - Lombard Tunnel (Broadwater County, Montana)
Abandoned tunnel on Abandoned Chicago, Milwaukee, St. Paul & Pacific RailroadAbandoned
MILW - Nimrod Tunnel (Granite County, Montana)
Built 1908, abandoned 1980Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific RailwayDerelict/abandoned
MILW - Ninemile Tunnel (Missoula County, Montana)
Built ca. 1908Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific RailroadDerelict/abandoned
MILW - Pipestone Pass Tunnel (Silver Bow County, Montana)
Built 1908; line abandoned 1980Abandoned tunnel under Pipestone Pass on Chicago, Milwaukee, St. Paul & Pacific RailroadDerelict/abandoned
MILW - Red Coulee Tunnel (Cascade County, Montana)
Built 1914Abandoned tunnel on Former Milwaukee Road RailwayDerelict/abandoned
MILW - Small Creek Tunnel #1 (Shoshone County, Idaho)
Built 1909Abandoned tunnel on Chicago, Milwaukee, St. Paul & Pacific RailroadDerelict/abandoned & collapsing
MILW - Tunnel No. 2 (Meagher County, Montana)
Tunnel on Unnamed Road (Former MILW Pacific Extension)
MILW - Tunnel No. 6 (Gallatin County, Montana)
Built ca. 1908Tunnel on 16 Mile Road (Former MILW Pacific Extension)Open to traffic
MILW - Tunnel No. 7 (Gallatin County, Montana)
Built ca. 1908Tunnel on 16 Mile Road (Former MILW Pacific Extension)Open to traffic
MILW - Tunnel No. 8 (Gallatin County, Montana)
Built ca. 1908Tunnel on 16 Mile Road (Former MILW Pacific Extension)Open to traffic
Minnehaha Tunnel (Hennepin County, Minnesota)
Built 1999Tunnel under MN 55 on Minnehaha ParkwayOpen to traffic
Mitchell Point Tunnel (Hood River County, Oregon)
Built 1915 back filled 1954 blasted away 1966Lost Tunnel under tunnels though Mitchell point on Former route US 30Demolished
MNA - Cotter Tunnel (Marion County, Arkansas)
Built 1903-04Tunnel on the MNA Railroad (formerly Missouri Pacific) just northwest of CotterOpen to railroad traffic
MNA - Crest Tunnel (Boone County, Arkansas)
Built 1903-05Tunnel on the Missouri and Northern Arkansas (formerly Missouri Pacific) Railway northwest of OmahaOpen to railroad traffic
MNA - Cricket Tunnel (Boone County, Arkansas)
Built 1903-05Tunnel on the Missouri and Northern Arkansas (formerly Missouri Pacific) just south of OmahaOpen to railroad traffic
MNA - Pyatt Tunnel (Marion County, Arkansas)
Built 1903-04Tunnel on the Missouri and Northern Arkansas Railroad (formerly Missouri Pacific) southeast of PyattOpen to railroad traffic
MNA - Reeds Spring Tunnel (Stone County, Missouri)
Tunnel on the MNA Railroad just southeast of Reeds SpringOpen to railroad traffic
MNCW - Otisville Tunnel (Orange County, New York)
Built 1908 by Erie RailroadTunnel on Metro-North RailroadOpen to traffic
Montgomery Bell Tunnel (Cheatham County, Tennessee)
Built 1819Tunnel 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 RROpen to pedestrians only
Montour Trail - National Tunnel (Allegheny County, Pennsylvania)
Tunnel under hill and Klinger road on Montour Trail - frmr Montour RROpen to pedestrians only
Moonville Rail Trail - Moonville Tunnel (Vinton County, Ohio)
Built 1857 and abandoned in 1989Abandoned tunnel with approach that crosses Raccoon Creek on CSX line between Cumberland, Maryland and CincinnatiAbandoned, but used by pedestrians
Moreau Tunnel (Cole County, Missouri)
Abandoned 1923Abandoned tunnel on Missouri Pacific RailroadDerelict/abandoned
Morenci Southern - Tunnel #1 (Greenlee County, Arizona)
Built 1902; Abandoned 1922Abandoned tunnel on Morenci Southern RailroadDerelict/abandoned
Morenci Southern - Tunnel #2 (Greenlee County, Arizona)
Built 1902; Abandoned 1922Abandoned tunnel on Morenci Southern RailroadDerelict/abandoned
Morenci Southern - Tunnel #3 (Greenlee County, Arizona)
Built 1902; Abandoned 1922Abandoned tunnel on Morenci Southern RailroadDerelict/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 RoadTunnel under spur of State Line Ridge on U.S. 441 New Found Gap Road (formerly Indian Gap Highway), Great Smoky Mountains National Park, TennesseeOpen to traffic
Mosier Twin Tunnels (Wasco County, Oregon)
Built 1920, Closed due to rock fall problems 1953, Reopened to public in 2000Tunnel under Mosier Tunnel on Historical Columbia River Highway TrailOpen to pedestrians
Mount Baldy Tunnel #2 (Los Angeles County, California)
Built 1954Tunnel under hillside on Mount Baldy RoadOpen to traffic
MP - East Barretts Tunnel (St. Louis County, Missouri)
Built 1851-1853; Abandoned 1944Lost Tunnel on Missouri Pacific RailroadTunnel demolished in 2000's
MP - Glenallen Tunnel (Bollinger County, Missouri)
Completed August 14, 1869; Final train through in April 1973; Abandoned 1974Abandoned railroad tunnel north of Glenallen on the Belmont Branch, Missouri PacificAbandoned and inaccessible on private land
MP - Vineland Tunnel (Jefferson County, Missouri)
Tunnel completed ca. 1858; tunnel removed by "daylighting" in the 1940sLost tunnel under a ridge on the former Missouri Pacific RailroadTunnel 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 RailroadAbandoned
MPA - Sisson Street Tunnel (Baltimore, Maryland)
Lost Tunnel under Maryland & Pennsylvania RR on Sisson StreetRemoved but not replaced
MRL - Bonita Tunnel (Missoula County, Montana)
Built 1882, widened 1909Tunnel on Montana Rail LinkOpen to traffic
MRL - Bozeman Tunnel (Gallatin County, Montana)
Built 1945 to replace earlier 1884 tunnelTunnel under Bozeman Pass on Montana Rail LinkOpen to traffic
MRL - Garrison Tunnel (Powell County, Montana)
Built 1882, widened 1909Tunnel on Montana Rail LinkOpen to traffic
MRL - John Tunnel (Sanders County, Montana)
Tunnel under hillside on Montana Rail LinkOpen to traffic
MRL - Mullan Tunnel (Lewis and Clark County, Montana)
Built 1883, enlarged and shortened 2009-10Bridge over Mullan Pass/Continental Divide on Montana Rail LinkOpen to traffic
MRL - Nimrod Tunnel (Granite County, Montana)
Built 1882, widened 1909Tunnel on Montana Rail LinkOpen to traffic
Mueller Tunnel (Los Angeles County, California)
Built 1942Tunnel under hillside on Mount Lowe RoadOpen to pedestrians only
Mule Pass Tunnel (Cochise County, Arizona)
Built 1958Tunnel on SR 80Open to traffic
MUNI - Sunset Tunnel (San Francisco County, California)
Built 1928Tunnel under Buena Vista Park on SF MuniOpen to traffic
MUNI - Twin Peaks Tunnel (San Francisco County, California)
Built 1918Tunnel on San Francisco Municipal RailwayOpen to traffic
N&W - Hollins Mill Tunnel (Lynchburg, Virginia)
Built ca1850-rough cut tunnel; abandoned 1982Tunnel under Hillside on James River Heritage TrailOpen to pedestrians only
N. Airport Drive Tunnel (Erie County, New York)
Tunnel under Buffalo Niagara International Airport runway on N. Airport DriveOpen to authorized vehicles 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 toolsTunnel on KY 77Open to traffic
National Road Bikeway - Tunnel (Belmont County, Ohio)
Built 1902, Rehabbed 1949 and 2009Tunnel 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, & 2007Tunnel under Bridge St on New England Central RailroadOpen to traffic
NECR - Burlington Tunnel (Chittenden County, Vermont)
Built 1860-1861, shotcrete lining applied 2008Tunnel under North Avenue on New England Central RailroadOpen to traffic
NECR - Norwich Tunnel (New London County, Connecticut)
Tunnel under Sherman Street on New England Central Railroad in NorwichOpen 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 RoadClosed to all traffic
Negro Mountain Tunnel (Somerset County, Pennsylvania)
Tunnel for Railroad Grade (never used)Intact but closed to all traffic
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