Continental Divide
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Alpine Tunnel (Gunnison County, Colorado)
Built 1880-82 by the Denver, South Park & Pacific Railroad; collapsed and abandoned in 1910Abandoned tunnel under the Continental Divide on the Denver, South Park & Pacific Railroad, southwest of St. ElmoAbandoned and partially caved-in
DRGW - Tennessee Pass Tunnel (Eagle County, Colorado)
Built 1890; Replaced by the current tunnel in 1945; Caved in July 10, 2012, creating a sinkhole that affected US 24Lost Tunnel on Denver & Rio Grande Western RailroadCollapsed
Eisenhower Tunnel (Summit County, Colorado)
Constructed started March 15, 1968; tunnel opened March 8, 1973Tunnel on I-70 Westbound at Loveland PassOpen to traffic
Henderson Mine Tunnel (Clear Creek County, Colorado)
Built 1976Tunnel through Red Mountain on Conveyor Belt (Formerly Henderson Mine Railroad)Open to private traffic
Johnson Tunnel (Summit County, Colorado)
Constructed started Aug. 18, 1975; tunnel completed on Dec. 21, 1979Tunnel on I-70 Eastbound at Loveland PassOpen to traffic
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
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
UP - Moffat Tunnel (Grand County, Colorado)
Built 1923-1928Tunnel under Continental Divide west of Denver on Union Pacific RROpen to railroad traffic, both freight and passenger trains
UP - Tennessee Pass Tunnel (Eagle County, Colorado)
Built 1945; unused since 1997Railroad tunnel under Tennessee Pass north of Leadville on closed Union Pacific RREmbargoed (unused but technically open)