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 1910
Abandoned tunnel under the Continental Divide on the Denver, South Park & Pacific Railroad, southwest of St. Elmo
Abandoned 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 24
Lost Tunnel on Denver & Rio Grande Western Railroad

Eisenhower Tunnel (Summit County, Colorado)
Built 1973
I-70 WB Tunnel under Loveland Pass.
Open to traffic

Henderson Mine Tunnel (Clear Creek County, Colorado)
Built 1976
Tunnel through Red Mountain on Conveyor Belt (Formerly Henderson Mine Railroad)
Open to private traffic

Johnson Tunnel (Summit County, Colorado)
Built 1979
I-70 EB under Loveland Pass.
Open to traffic

MILW - Pipestone Pass Tunnel (Silver Bow County, Montana)
Built 1908
Abandoned tunnel under Pipestone Pass on Chicago, Milwaukee, St. Paul & Pacific Railroad

MRL - Mullan Tunnel (Lewis and Clark County, Montana)
Built 1883, enlarged and shortened 2009-10
Bridge over Mullan Pass/Continental Divide on Montana Rail Link
Open to traffic

UP - Moffat Tunnel (Grand County, Colorado)
Built 1923-1928
Tunnel under Continental Divide west of Denver on Union Pacific RR
Open to railroad traffic, including Amtrak's California Zephyr and Ski Train

UP - Tennessee Pass Tunnel (Eagle County, Colorado)
Built 1945; unused since 1997
Railroad tunnel under Tennessee Pass north of Leadville on closed Union Pacific RR
Embargoed (unused but technically open)