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Castle Rock Lower Bridge

Photos 

Oblique view from northeast

Water flows from right to left in this photo.

Photo taken by Roger Deschner in May 2015

License: Creative Commons Attribution-Share-Alike (CC BY-SA)

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BH Photo #325493

Map 

Description 

One of two bridges on a former alignment of Boulder Canyon Highway (CO 119). When the highway was routed on a new alignment in 1953, this section of the old road, with its two bridges, was left in place, with picnic tables installed. The area around this bridge is popular today for fishing.

NBI lists construction date as 1930, noting that dates ending in 0 are often estimates. The style of the art deco railing does suggest the 1930s.

The two bridges are very different. This one is a concrete slab.

Facts 

Overview
Concrete slab bridge over Middle Boulder Creek on Old Boulder Canyon Drive (Co Rd 54A)
Location
Boulder County, Colorado
Status
Open to traffic; posted for load
History
Built ca. 1930; bypassed 1953, but left in place to serve recreational area
Design
Concrete slab
Dimensions
Length of largest span: 20.3 ft.
Total length: 23.6 ft.
Deck width: 20.3 ft.
Recognition
Eligible for the National Register of Historic Places
Approximate latitude, longitude
+39.98052, -105.45461   (decimal degrees)
39°58'50" N, 105°27'17" W   (degrees°minutes'seconds")
Approximate UTM coordinates
13/461183/4425693 (zone/easting/northing)
Inventory number
BH 67777 (Bridgehunter.com ID)
Inspection (as of 01/2015)
Deck condition rating: Fair (5 out of 9)
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Serious (3 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 39.0 (out of 100)
Average daily traffic (as of 2011)
75

Categories 

Boulder County, Colorado (27)
Built 1930 (1,605)
Built during 1930s (10,576)
Colorado (599)
Flared (406)
NR-eligible (3,971)
Open (36,569)
Owned by county (18,854)
Skewed (4,672)
Slab (1,524)
Span length under 25 feet (5,767)
Structurally deficient (18,430)
Total length under 25 feet (1,995)

Update Log 

  • May 25, 2015: Added by Roger Deschner

Related Bridges 

Sources 

  • Roger Deschner - rogerdeschner [at] gmail [dot] com