Status: Open to traffic
Location: 40.247969,-105.289607
Carries Apple Valley Road (CR 71) over North St. Vrain Creek
Design: arch/through/wood
Design Details: Modern timber through arch
Total Length: 76.1 Feet
Span Length: 66.9 Feet
Overview: Through arch bridge over North St. Vrain Creek on Apple Valley Road (CR 71)
History: Built 1991
Built: 1991
Location: Boulder County
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Status: Open to traffic
Location: 40.006080,-105.334480
Carries CO 119 over Rock formation
Design: tunnel
Design Details: Tunnel
Total Length: 350.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on CO 119, between Nederland and Boulder
History: Built 1953
Built: 1953
Location: Boulder County
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481190
CO 119 Tunnel
Photofrom mesalek
Status: Open to traffic
Location: 40.014444,-105.321111
Carries Sh 119 Ml over Boulder Creek
Design: beam/tee
Design Details: Concrete tee beam
Total Length: 100.1 Feet
Span Length: 49.9 Feet
Overview: Concrete tee beam bridge over Boulder Creek on Sh 119 Ml
History: Built 1953
Built: 1953
Location: Boulder County
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193889
Photo From National Register Multiple Property Submission
193890
Photo From National Register Multiple Property Submission
488783
Boulder Creek Bridge
Photo taken by Storyofwhere
Status: Open to traffic
Location: 40.222500,-105.271389
Carries CO-7 over North St Vrain Creek
Design: frame/concrete
Design Details: Concrete Rigid-Frame
Total Length: 65.9 Feet
Span Length: 60.0 Feet
Overview: Concrete rigid frame bridge over North St Vrain Creek on CO-7
History: Built 1955
Built: 1955
Location: Boulder County
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193891
Photo From National Register Multiple Property Submission
193892
Photo From National Register Multiple Property Submission
Status: Closed to all traffic
1988 preservation project failed after partial collapse in 1990, which remains controversial today.
Location: 39.935961,-105.659393
Carries Denver & Salt Lake Railway over
Design: tunnel
Design Details: Tunnel
Total Length: 150.0 Feet
Span Length: 150.0 Feet
Overview: Tunnel on Abandoned Moffat Road
History: Built 1903-1905; Bypassed 1928; Abandoned 1935; Reopened as a road 1955-1979 and 1988-1990.
Built: 1903
Location: Boulder County
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295352
Photo taken by Alex Patton in July 2006
295423
View through tunnel
Looking through the Needle's Eye Tunnel from a distance to the south. At the time this picture was taken, rehabilitation was underway and you could see through it.
Photo taken by Roger Deschner in July, 1987
Status: Closed to all traffic, but still carries a natural gas pipeline
Location: 39.940081,-105.669757
Carries Denver and Salt Lake Railway over Devil's Slide
Design: beam/stringer/wood
Design Details: Two timber stringer trestles
Total Length: 0.0 Feet
Span Length: 0.0 Feet
Overview: Timber stringer bridge over Devil's Slide on Denver and Salt Lake Railway
History: Built 1903-05; bypassed 1928; tracks removed 1935; reopened as a road 1955-1979.
Built: 1903
Location: Boulder County
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295618
Devil's Slide - east trestle
Winston Walker
Status: Open to traffic
Location: 39.932867,-105.395724
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 639.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.928663,-105.373730
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 1553.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.932826,-105.387205
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 812.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.924780,-105.367196
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 180.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.924485,-105.363699
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 667.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.924310,-105.358466
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 460.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.923553,-105.354694
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 1055.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.920546,-105.323302
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 238.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.918527,-105.320354
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 1730.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.913985,-105.306995
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 434.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.915555,-105.305240
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 312.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.917246,-105.302863
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 429.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.918683,-105.300892
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 238.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.918992,-105.298340
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 1572.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903, wood lining burned 1943
Built: 1903
Location: Boulder County
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315874
Tunnel #10
One of the many rail tunnels in the Tunnel District of the Moffat Route west of Denver. The tracks are located at the end of the Rattlesnake Gulch Trail in Eldorado Canyon State Park.
Photo by Jesse Varner
Status: Open to traffic
Location: 39.923677,-105.287599
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 753.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.920356,-105.283368
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 208.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.917292,-105.282964
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 536.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic
Location: 39.914289,-105.283629
Carries Union Pacific Railroad over
Design: tunnel
Design Details: Tunnel
Total Length: 585.0 Feet
Span Length: 0.0 Feet
Overview: Tunnel on Union Pacific Railroad
History: Built 1903
Built: 1903
Location: Boulder County
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Status: Open to traffic; posted for load
Location: 39.979205,-105.454437
Carries Old Boulder Canyon Drive (Co Rd 54A) over Middle Boulder Creek
Design: beam
Design Details: Girder/floorbeam system with jack-arch deck
Total Length: 33.1 Feet
Span Length: 28.5 Feet
Overview: Steel girder/floorbeam bridge over Middle Boulder Creek on Old Boulder Canyon Drive (Co Rd 54A, former CO 119)
History: Built ca. 1930; bypassed 1953, but left in place to serve recreational area
Built: 1930
Location: Boulder County
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325488
Oblique view from northwest
In this photo, water flows from right to left
Photo taken by Roger Deschner in May 2015
325489
View across deck, from west
Photo taken by Roger Deschner in May 2015
325490
View downstream from bridge
Photo taken by Roger Deschner in May 2015
340482
North face
This more clearly shows the bolts (not rivets) where the floorbeams are connected.
Photo taken by Roger Deschner in July 2015
340483
View of Jack-arch deck under bridge, looking north
I returned to this bridge, and dangled my phone under it with a "selfie stick" to get this image of the floorbeam system underneath. The large beam in this photo is perpendicular to the large side beams that support the whole bridge. The bolts in the previous photo are where this beam and its counterparts connect to the girders. Interesting and apparently rare jack-arch deck structure.
Photo taken by Roger Deschner in July 2015
Status: Open to traffic; posted for load
Location: 39.980519,-105.454606
Carries Old Boulder Canyon Drive (Co Rd 54A) over Middle Boulder Creek
Design: slab
Design Details: Concrete slab
Total Length: 23.6 Feet
Span Length: 20.3 Feet
Overview: Concrete slab bridge over Middle Boulder Creek on Old Boulder Canyon Drive (Co Rd 54A)
History: Built ca. 1930; bypassed 1953, but left in place to serve recreational area
Built: 1930
Location: Boulder County
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325493
Oblique view from northeast
Water flows from right to left in this photo.
Photo taken by Roger Deschner in May 2015
325494
Looking upstream beside bridge
Photo taken by Roger Deschner in May 2015
325495
Railing detail
Art deco style suggests construction in 1930s
Photo taken by Roger Deschner in May 2015
325496
Deck shot looking west (upstream)
Sign in distance lists recreation area regulations
Photo taken by Roger Deschner in May 2015
325497
View of bridge and stream looking west
Photo taken by Roger Deschner in May 2015
Status: Replaced by new bridge
Location: 40.011722,-105.272667
Carries 17th Street over Boulder Creek
Design: arch/deck/luten
Design Details: Luten arch
Total Length: 0.0 Feet
Span Length: 70.0 Feet
Overview: Lost Luten arch bridge over Boulder Creek on 17th Street
History: Built ca. 1907; Replaced 1985
Built: ca. 1907
Location: Boulder County
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374554
Published prior to 1923
Status: Open to pedestrians only
Location: 40.009668,-105.274266
Carries Pedestrian Trail over Varsity Lake
Design: arch/deck/stone
Design Details: Stone arch
Total Length: 0.0 Feet
Span Length: 0.0 Feet
Overview: Stone arch bridge over Varsity Lake on Pedestrian Trail
History: Built 1935
Built: 1935
Location: Boulder County
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484849
Varsity Bridge
Photo from elevation.maplogs
Status: Open to traffic
Location: 40.036998,-105.252090
Carries a driveway over Wonderland Creek
Design: truss/pony/pratt
Design Details: Pratt pony truss
Total Length: 0.0 Feet
Span Length: 0.0 Feet
Overview: Pratt pony truss bridge over Wonderland Creek on a driveway
History:
Built:
Location: Boulder County
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484570
Before and After photos along Wonderland Creek with bridge in background
This next series of photos is down along Iris Avenue near where we had to purchase and demolish that single-family residence. This is actually near where the Bolder Boulder used to start many years ago before it was moved near the 29th Street Mall. The before photo shows a creek that was perhaps two feet wide, and the after photo shows the deepened and widened creek, with a boulder drop structure providing stability.
Photo from Mile High Flood District
Status: Open to traffic to access parking area
Location: 40.089225,-105.496428
Carries Old SR 72 over James Creek
Design: beam/stringer/concrete
Design Details: Concrete stringer on stone masonry abutments
Total Length: 0.0 Feet
Span Length: 0.0 Feet
Overview: Concrete stringer bridge over James Creek on Old SR 72
History: Built ca 1927; bypassed 1959
Built: 1927
Location: Boulder County
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452559
East side view
Note beautiful stone masonry abutments
Photo taken by Roger Deschner in July 2019
452560
Deck view, lookig south
Note parked cars on abandoned roadway across bridge. This is overflow parking for a popular trailhead.
Photo taken by Roger Deschner in July 2019
452561
Deck view, looking north
This is the main parking area for the trailhead. SH 72 is to the right, and the trail heads off to the left.
Photo taken by Roger Deschner in July 2019
452562
Concrete balusrade railing
Photo taken by Roger Deschner in July 2019
452563
Endpost detail, southeast
Photo taken by Roger Deschner in July 2019
452564
Southeast endpost with wooden post
The wooden post may have held a reflector of some kind.
Photo taken by Roger Deschner in July 2019
452565
Stone masonry wingwall detail
Photo taken by Roger Deschner in July 2019
452566
Damage to concrete deck
Photo taken by Roger Deschner in July 2019
452567
Replacement culvert on modern SH 72
NBI says it was built in 1959
Photo taken by Roger Deschner in July 2019
Status: Open to traffic
Location: 40.136090,-105.492069
Carries Peaceful Valley Road (CR 103, former CO 72) over Middle Saint Vrain Creek
Design: beam/stringer/concrete
Design Details: Concrete tee beam with stone abutments
Total Length: 35.4 Feet
Span Length: 29.2 Feet
Overview: Concrete stringer bridge over Middle Saint Vrain Creek on Peaceful Valley Road (current CR 103, former CO 72)
History: Built 1927; CO 72 bypassed this bridge in 1959
Built: 1927
Location: Boulder County
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452477
Peaceful Valleu Road Bridge Deck View
Looking south
Photo taken by Roger Deschner in July 2019
452481
Northeast endpost
Note that endpost is separate from railing. Also embossed pattern at ends of railings
Photo taken by Roger Deschner in July 2019
452482
Railing detail, east railing
Photo taken by Roger Deschner in July 2019
452483
US Benchmark on southeast endpost
Photo taken by Roger Deschner in July 2019
452486
View north
Stone embankment; road beyond stop sign is mainline CO-72.
Photo taken by Roger Deschner in July 2019
452487
County benchmark
on southwest endpost
Photo taken by Roger Deschner in July 2019
452488
West side railing
also showing location of county benchmark, and embossed pattern on side of endposts that faces the water.
Photo taken by Roger Deschner in July 2019
452490
Endpost detail, embossed pattern facing water
Photo taken by Roger Deschner in July 2019
452491
West railing, with water rushing under bridge.
Water was high. It had been raining a lot.
Photo taken by Roger Deschner in July 2019
452492
View from northwest
Photo taken by Roger Deschner in July 2019
452493
Deck view looking south
Photo taken by Roger Deschner in July 2019
Status: Open to traffic
Location: 40.154607,-105.466265
Carries Riverside Drive (current CR 103, former SH 72) over Cave Creek
Design: beam/stringer/concrete
Design Details: Concrete stringer on stone masonry abutments
Total Length: 0.0 Feet
Span Length: 0.0 Feet
Overview: Concrete stringer bridge over Cave Creek on Riverside Drive (current CR 103, former SH 72)
History: Built ca 1927
Built: 1927
Location: Boulder County
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452568
View from northwest
Photo taken by Roger Deschner in July 2019
452569
Deck view, looking north
Photo taken by Roger Deschner in July 2019
452570
View east from bridge
Confluence of Cave Creek, and Middle Saint Vrain Creek, which parallels Riverside Drive
Photo taken by Roger Deschner in July 2019
452571
West railing with pipeline
"103-3" stenciled on bridge is the Boulder County highway number.
Photo taken by Roger Deschner in July 2019
452572
FAILING stone masonry south abutment
Photo taken by Roger Deschner in July 2019
452573
East railing endpost detail
Note endpost separate from railing. BTW both west side endposts have been heavily damaged. Both east side endposts are OK.
Photo taken by Roger Deschner in July 2019
452574
East railing overview
Photo taken by Roger Deschner in July 2019
Special Bridge Conditions Legend: R - Former location of relocated bridge. ! - At risk for demolition or destruction. X - Confirmed demolished or collapsed. S - Dismantled and/or in storage. L - Severe loss of historic integrity due to alteration.
