Boulder County

Apple Valley Road Bridge   [Map · Street View]
Through arch bridge over North St. Vrain Creek on Apple Valley Road (CR 71)
Open to traffic
Built 1991
Boulder Creek Bridge   [Map · Street View]
Concrete tee beam bridge over Boulder Creek on Sh 119 Ml
Open to traffic
Built 1953
Boulder Creek Bridge   [Map]
Lost Luten arch bridge over Boulder Creek on 17th Street
Replaced by new bridge
Replaced 1985
Castle Rock Lower Bridge   [Map]
Concrete slab bridge over Middle Boulder Creek on Old Boulder Canyon Drive (Co Rd 54A)
Open to traffic; posted for load
Built ca. 1930; bypassed 1953, but left in place to serve recreational area
Castle Rock Upper Bridge   [Map]
Steel girder/floorbeam bridge over Middle Boulder Creek on Old Boulder Canyon Drive (Co Rd 54A, former CO 119)
Open to traffic; posted for load
Built ca. 1930; bypassed 1953, but left in place to serve recreational area
CO 119 Tunnel   [Map · Street View]
Tunnel on CO 119, between Nederland and Boulder
Open to traffic
Built 1953
Devil's Slide Trestles   [Map]
Timber stringer bridge over Devil's Slide on Denver and Salt Lake Railway
Closed to all traffic, but still carries a natural gas pipeline
Built 1903-05; bypassed 1928; tracks removed 1935; reopened as a road 1955-1979.
Needle's Eye Tunnel   [Map]
Tunnel on Abandoned Moffat Road
Closed to all traffic
Built 1903-1905; Bypassed 1928; Abandoned 1935; Reopened as a road 1955-1979 and 1988-1990.
North St Vrain Creek Bridge   [Map · Street View]
Concrete rigid frame bridge over North St Vrain Creek on CO-7
Open to traffic
Built 1955
UP - Tunnel 10   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903, wood lining burned 1943
UP - Tunnel 11   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903
UP - Tunnel 12   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903
UP - Tunnel 13   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903
UP - Tunnel 14   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903
UP - Tunnel 17   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903
UP - Tunnel 18   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903
UP - Tunnel 19   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903
UP - Tunnel 20   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903
UP - Tunnel 21   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903
UP - Tunnel 22   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903
UP - Tunnel 23   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903
UP - Tunnel 24   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903
UP - Tunnel 5   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903
UP - Tunnel 6   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903
UP - Tunnel 7   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903
UP - Tunnel 8   [Map]
Tunnel on Union Pacific Railroad
Open to traffic
Built 1903