List of tunnels in Montana
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.
- Chicago, Milwaukee, St. Paul and Pacific Railroad 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,, el.
- * Amphitheater Tunnel Number 4, abandoned rail tunnel, 1913, Milwaukee Road, Chouteau County, Montana,, el.
- * Belt Creek Tunnel Number 5, abandoned rail tunnel, 1913, Milwaukee Road, Chouteau County, Montana,, el.
- * Red Coulee Tunnel Number 6, abandoned rail tunnel, 1914, Milwaukee Road, Cascade County, Montana,, el.
- Beavertail Tunnel, rail tunnel, near I-90 interchange 130 in Missoula County, Montana,, el.
- Bighorn Tunnel, abandoned rail tunnel, 1882-1952, near I-94 interchange 49 in Yellowstone County, Montana,, el.
- Bozeman Tunnels, rail tunnels, under I-90 at Bozeman Pass in Gallatin County, Montana,, el.
- *abandoned rail tunnel, 1884-c. 1945, Northern Pacific Railway
- *active rail tunnel, 1945, Montana Rail Link
- Flathead Tunnel, rail tunnel, 1970, BNSF Railway in Lincoln County northwest of Kalispell
- Going-to-the-Sun Road, automobile tunnels, Glacier National Park
- Helena Valley Canal Tunnel, water tunnel, east of Helena in Lewis and Clark County, Montana,, el.
- John Tunnel, rail tunnel, in Sanders County, Montana northwest of Missoula,, el.
- Monitor Tunnel, abandoned rail tunnel, in Butte, Silver Bow County, Montana,, el.
- Mullan Tunnel, rail tunnel, c. 1883, Montana Rail Link, under the Continental Divide at Mullan Pass, northwest of Helena between Lewis and Clark County, Montana and Powell County, Montana,, el.
- Nimrod Tunnels, rail tunnels, adjacent to I-90 in Granite County, Montana southeast of Missoula,, el.
- *abandoned rail tunnel, in use 1908-1980, Chicago, Milwaukee, St. Paul & Pacific Railroad Tunnel Number 15
- *active rail tunnel, 1882, BNSF Railway
- Painted Robe Tunnel, rail tunnel, in Golden Valley County, Montana northwest of Billings,, el.
- Ptarmigan Tunnel, pedestrian tunnel, 1930, in Glacier National Park, Glacier County, Montana,, el.
- 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,, el.
- Schurchs Tunnel, Powell County, Montana,, el.
- Toston Canal Tunnel, water tunnel, Broadwater County, Montana, between Helena and Bozeman,, el.
- 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,, el.
- * 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,, el.
- Tunnel Number 1, former rail tunnel, possibly either bypassed or daylighted, just north of interchange 324 on I-90 in Park County, Montana,, el.
- adjacent rail tunnels along US 2 adjacent to Glacier National Park in Flathead County, Montana, from south to north:
- * Tunnel Number 2, rail tunnel,, el.
- * Tunnel Number 3, rail tunnel,, el.
- Two Leggins Canal Tunnel, water tunnel, in Big Horn County, Montana north of Hardin,, el.
- Vista Tunnel, former rail tunnel, either bypassed or daylighted, northwest of Whitefish in Flathead County, Montana,, el.
- Wayne Tunnel, rail tunnel, 1911, BNSF Railway, southeast of Great Falls in Cascade County, Montana,, el.
- Wickes Tunnel/Boulder Tunnel, abandoned rail tunnel, Great Northern Railway, north of Boulder in Jefferson County, Montana,, el.