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Boulder County

17th Street-Boulder Creek Bridge [Map]
Lost Luten arch bridge over Boulder Creek on 17th Street
Replaced by new bridge
Built ca. 1907; Replaced 1985

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

Broadway Bridge [Map · Street View]
Steel stringer bridge over Boulder Creek on Broadway
Open to traffic
Built 1922

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.

First National Center Bridge [Map · Street View]
Pratt pony truss bridge over Wonderland Creek on a driveway
Open to traffic

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

Old James Creek Bridge [Map · Street View]
Concrete stringer bridge over James Creek on Old SR 72
Open to traffic to access parking area
Built ca 1927; bypassed 1959

Peaceful Valley Road Bridge [Map]
Concrete stringer bridge over Middle Saint Vrain Creek on Peaceful Valley Road (current CR 103, former CO 72)
Open to traffic
Built 1927; CO 72 bypassed this bridge in 1959

Riverside Drive Bridge [Map]
Concrete stringer bridge over Cave Creek on Riverside Drive (current CR 103, former SH 72)
Open to traffic
Built ca 1927

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 25 [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

Varsity Bridge [Map · Street View]
Stone arch bridge over Varsity Lake on Pedestrian Trail
Open to pedestrians only
Built 1935