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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.
* (four) Chicago, Milwaukee, St. Paul and Pacific Railroad (Milwaukee Road) tunnels, abandoned rail tunnels, Great Falls Line, from east to west:
* , abandoned rail tunnel, c. 1913, Milwaukee Road, Chouteau County, Montana, 47°32′58″N 110°55′01″W / 47.54944°N 110.91694°W, el. 3,386 feet (1,032 m)
* , abandoned rail tunnel, 1913, Milwaukee Road, Chouteau County, Montana, 47°33′06″N 110°55′44″W / 47.55167°N 110.92889°W, el. 3,376 feet (1,029 m)
* , abandoned rail tunnel, 1913, Milwaukee Road, Chouteau County, Montana, 47°33′19″N 110°56′49″W / 47.55528°N 110.94694°W, el. 3,307 feet (1,008 m)
* , abandoned rail tunnel, 1914, Milwaukee Road, Cascade County, Montana, 47°33′14″N 110°57′15″W / 47.55389°N 110.95417°W, el. 3,287 feet (1,002 m)
* , 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, el. 3,691 feet (1,125 m)
* , 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, 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, 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
* , 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, el. 4,035 feet (1,230 m)
* , rail tunnel, in Sanders County, Montana northwest of Missoula, 47°20′06″N 114°47′12″W / 47.33500°N 114.78667°W, el. 2,680 feet (820 m)
* , abandoned rail tunnel, in Butte, Silver Bow County, Montana, 46°01′24″N 112°28′32″W / 46.02333°N 112.47556°W, 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, el. 5,830 feet (1,780 m)
* (two) , 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, 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)
* , rail tunnel, in Golden Valley County, Montana northwest of Billings, 46°11′41″N 108°56′32″W / 46.19472°N 108.94222°W, 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, 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, el. 5,141 feet (1,567 m)
* , Powell County, Montana, 46°17′21″N 112°33′48″W / 46.28917°N 112.56333°W, el. 7,424 feet (2,263 m)
* , water tunnel, Broadwater County, Montana, between Helena and Bozeman, 46°07′36″N 111°26′32″W / 46.12667°N 111.44222°W, 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:
* , 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, el. 3,504 feet (1,068 m)
* , 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, el. 3,592 feet (1,095 m)
* , 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, 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:
* , rail tunnel, 48°22′06″N 113°40′31″W / 48.36833°N 113.67528°W, el. 3,734 feet (1,138 m)
* , rail tunnel, 48°22′23″N 113°40′55″W / 48.37306°N 113.68194°W, el. 3,783 feet (1,153 m)
* , water tunnel, in Big Horn County, Montana north of Hardin, 45°58′22″N 107°32′13″W / 45.97278°N 107.53694°W, el. 2,789 feet (850 m)
* , 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, el. 3,179 feet (969 m)
* , 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, el. 3,779 feet (1,152 m)
* /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, el. 6,224 feet (1,897 m) (en)
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