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Gilpin County

Bobtail Road Bridge [Map · Street View]
Steel through arch bridge over Bobtail Creek on Bobtail Road in Black Hawk
Open to traffic
Built 1999

Moffat Tunnel [Map]
Tunnel under Continental Divide west of Denver on Union Pacific RR
Open to railroad traffic, including Amtrak's California Zephyr
Built 1923-1928

Tunnel No. 4 [Map · Street View]
Abandoned tunnel on CO 119 near the junction with US 6
Still intact, but boarded up after the roads were realigned to make this tunnel unnecessary
Built 1939