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There are 27 named tunnels in Montana. A tunnel is an underground passageway, completely enclosed except for openings for egress, commonly at each end. Tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal.

This list is incomplete; you can help by adding missing items. (February 2011)

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• (four) Chicago, Milwaukee, St. Paul and Pacific Railroad (Milwaukee Road) tunnels, abandoned rail tunnels, Great Falls Line, from east to west:
  • Lacey Tunnel Number 3, abandoned rail tunnel, c. 1913, Milwaukee Road, Chouteau County, Montana, 47°32′58″N 110°55′01″W / 47.54944°N 110.91694°W / 47.54944; -110.91694 (Lacey Tunnel Number 3), el. 3,386 feet (1,032 m)
  • Amphitheater Tunnel Number 4, abandoned rail tunnel, 1913, Milwaukee Road, Chouteau County, Montana, 47°33′06″N 110°55′44″W / 47.55167°N 110.92889°W / 47.55167; -110.92889 (Amphitheater Tunnel Number 4), el. 3,376 feet (1,029 m)
  • Belt Creek Tunnel Number 5, abandoned rail tunnel, 1913, Milwaukee Road, Chouteau County, Montana, 47°33′19″N 110°56′49″W / 47.55528°N 110.94694°W / 47.55528; -110.94694 (Belt Creek Tunnel Number 5), el. 3,307 feet (1,008 m)
  • Red Coulee Tunnel Number 6, abandoned rail tunnel, 1914, Milwaukee Road, Cascade County, Montana, 47°33′14″N 110°57′15″W / 47.55389°N 110.95417°W / 47.55389; -110.95417 (Red Coulee Tunnel Number 6), el. 3,287 feet (1,002 m)
• Beavertail Tunnel, rail tunnel, near I-90 interchange 130 in Missoula County, Montana, 46°43′26″N 113°34′59″W / 46.72389°N 113.58306°W / 46.72389; -113.58306 (Beavertail Tunnel), el. 3,691 feet (1,125 m)
• Bighorn Tunnel, abandoned rail tunnel, 1882-1952, near I-94 interchange 49 in Yellowstone County, Montana, 46°08′39″N 107°31′11″W / 46.14417°N 107.51972°W / 46.14417; -107.51972 (Bighorn Tunnel), el. 2,835 feet (864 m)
• (two) Bozeman Tunnels, rail tunnels, under I-90 at Bozeman Pass in Gallatin County, Montana, 45°39′57″N 110°48′29″W / 45.66583°N 110.80806°W / 45.66583; -110.80806 (Bozeman Tunnel), el. 5,738 feet (1,749 m)
  • abandoned rail tunnel, 1884-c. 1945, Northern Pacific Railway
  • active rail tunnel, 1945, Montana Rail Link (formerly Northern Pacific Railway)
• Flathead Tunnel, rail tunnel, 1970, BNSF Railway (formerly Burlington Northern Railroad and Great Northern Railway) in Lincoln County northwest of Kalispell
• Helena Valley Canal Tunnel, water tunnel, east of Helena in Lewis and Clark County, Montana, 46°38′35″N 111°45′20″W / 46.64306°N 111.75556°W / 46.64306; -111.75556 (Helena Valley Canal Tunnel), el. 4,035 feet (1,230 m)
• John Tunnel, rail tunnel, in Sanders County, Montana northwest of Missoula, 47°20′06″N 114°47′12″W / 47.33500°N 114.78667°W / 47.33500; -114.78667 (John Tunnel), el. 2,680 feet (820 m)
• Monitor Tunnel, abandoned rail tunnel, in Butte, Silver Bow County, Montana, 46°01′24″N 112°28′32″W / 46.02333°N 112.47556°W / 46.02333; -112.47556 (Monitor Tunnel), el. 6,361 feet (1,939 m)
• Mullan Tunnel, rail tunnel, c. 1883, Montana Rail Link (formerly Northern Pacific Railway), under the Continental Divide at Mullan Pass, northwest of Helena between Lewis and Clark County, Montana and Powell County, Montana, 46°38′11″N 112°18′30″W / 46.63639°N 112.30833°W / 46.63639; -112.30833 (Mullan Tunnel), el. 5,830 feet (1,780 m)
• (two) Nimrod Tunnels, rail tunnels, adjacent to I-90 in Granite County, Montana southeast of Missoula, 46°42′35″N 113°30′56″W / 46.70972°N 113.51556°W / 46.70972; -113.51556 (Nimrod Tunnels), el. 3,681 feet (1,122 m)
  • abandoned rail tunnel, in use 1908-1980, Chicago, Milwaukee, St. Paul & Pacific Railroad Tunnel Number 15
  • active rail tunnel, 1882, BNSF Railway (formerly Montana Rail Link and Northern Pacific Railway)
• Painted Robe Tunnel, rail tunnel, in Golden Valley County, Montana northwest of Billings, 46°11′41″N 108°56′32″W / 46.19472°N 108.94222°W / 46.19472; -108.94222 (Painted Robe Tunnel), el. 3,763 feet (1,147 m)
• Ptarmigan Tunnel, pedestrian tunnel, 1930, in Glacier National Park, Glacier County, Montana, 48°50′57″N 113°42′28″W / 48.84917°N 113.70778°W / 48.84917; -113.70778 (Ptarmigan Tunnel), el. 7,100 feet (2,200 m)
• St. Paul Pass Tunnel/Taft Tunnel, abandoned rail tunnel, in use 1908-1980, Chicago, Milwaukee, St. Paul & Pacific Railroad Tunnel Number 20, between Mineral County, Montana and Shoshone County, Idaho, now part of Milwaukee Road Rail Trail, 47°23′25″N 115°38′55″W / 47.39028°N 115.64861°W / 47.39028; -115.64861 (Saint Paul Pass Tunnel), el. 5,141 feet (1,567 m)
• Schurchs Tunnel, Powell County, Montana, 46°17′21″N 112°33′48″W / 46.28917°N 112.56333°W / 46.28917; -112.56333 (Schurchs Tunnel), el. 7,424 feet (2,263 m)
• Toston Canal Tunnel, water tunnel, Broadwater County, Montana, between Helena and Bozeman, 46°07′36″N 111°26′32″W / 46.12667°N 111.44222°W / 46.12667; -111.44222 (Toston Tunnel), el. 4,209 feet (1,283 m)
• (two) rail tunnels, on the other side of the Missouri River from I-15, from east to west:
  • Tunnel Number 1, rail tunnel, on the other side of the Missouri River from interchange 244 on I-15 in Cascade County, Montana, 47°09′33″N 111°49′52″W / 47.15917°N 111.83111°W / 47.15917; -111.83111 (Tunnel Number 1), el. 3,504 feet (1,068 m)
  • Tunnel Number 3, rail tunnel, on the other side of the Missouri River from Mile Marker 237 on I-15 in Lewis and Clark County, Montana, 47°06′32″N 111°57′03″W / 47.10889°N 111.95083°W / 47.10889; -111.95083 (Tunnel Number 3), el. 3,592 feet (1,095 m)
• Tunnel Number 1, former rail tunnel, possibly either bypassed or daylighted, just north of interchange 324 on I-90 in Park County, Montana, 45°39′52″N 110°44′03″W / 45.66444°N 110.73417°W / 45.66444; -110.73417 (Tunnel Number 1), el. 5,371 feet (1,637 m)
• (two) adjacent rail tunnels along US 2 adjacent to Glacier National Park in Flathead County, Montana, from south to north:
  • Tunnel Number 2, rail tunnel, 48°22′06″N 113°40′31″W / 48.36833°N 113.67528°W / 48.36833; -113.67528 (Tunnel Number 2), el. 3,734 feet (1,138 m)
  • Tunnel Number 3, rail tunnel, 48°22′23″N 113°40′55″W / 48.37306°N 113.68194°W / 48.37306; -113.68194 (Tunnel Number 3), el. 3,783 feet (1,153 m)
• Two Leggins Canal Tunnel, water tunnel, in Big Horn County, Montana north of Hardin, 45°58′22″N 107°32′13″W / 45.97278°N 107.53694°W / 45.97278; -107.53694 (Two Leggins Tunnel), el. 2,789 feet (850 m)
• Vista Tunnel, former rail tunnel, either bypassed or daylighted, northwest of Whitefish in Flathead County, Montana, 48°28′17″N 114°26′33″W / 48.47139°N 114.44250°W / 48.47139; -114.44250 (Vista Tunnel), el. 3,179 feet (969 m)
• Wayne Tunnel, rail tunnel, 1911, BNSF Railway (formerly Great Northern Railway), southeast of Great Falls in Cascade County, Montana, 47°26′21″N 110°56′35″W / 47.43917°N 110.94306°W / 47.43917; -110.94306 (Wayne Tunnel), el. 3,779 feet (1,152 m)
• Wickes Tunnel/Boulder Tunnel, abandoned rail tunnel, Great Northern Railway, north of Boulder in Jefferson County, Montana, 46°19′48″N 112°06′48″W / 46.33000°N 112.11333°W / 46.33000; -112.11333 (Wickes Tunnel), el. 6,224 feet (1,897 m)

See also

• Railroads in Montana
• List of tunnels in the United States

Notes

1. "Lacey Tunnel Number 3". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
2. "Amphitheater Tunnel Number 4". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
3. "Belt Creek Tunnel Number 5". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
4. "Red Coulee Tunnel Number 6". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
5. "Beavertail Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
6. "Bighorn Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
7. "Bozeman Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
8. "Helena Valley Canal Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
9. "John Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
10. "Monitor Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
11. "Mullan Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
12. "Nimrod Tunnels". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
13. "Painted Robe Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
14. "Ptarmigan Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
15. "Saint Paul Pass Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
16. "Schurchs Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
17. "Toston Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
18. "Tunnel Number 1". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
19. "Tunnel Number 3". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
20. "Tunnel Number 1". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
21. "Tunnel Number 2". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
22. "Tunnel Number 3". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
23. "Two Leggins Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
24. "Vista Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
25. "Wayne Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
26. "Wickes Tunnel". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.

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