Parks Bar Bridge
The Parks Bar Bridge is significant under Criterion C, as a distinctive example of an unusual method of construction. It is one of the earliest and largest remaining examples of the Thomas System of pre-cast, reinforced concrete, three-hinged arch bridges. This early 20th-century design and method of bridge construction was patented by William M. Thomas during his association with W.S. Post in their Los Angeles engineering firm of Thomas and Post. This is the sixth of approximately seventeen Thomas System bridges built in California, and one of only three remaining. The bridge was determined eligible for the National Register of Historic Places in 1986.
-- Historic American Engineering Record
- Open-spandrel arch bridge over Yuba River on CA 20
- Yuba County, California
- Replaced in 1993 and destroyed.
- Built 1913
- - Thomas & Post (Engineering Firm)
- W. S. Post
- William M. Thomas (Engineer)
- Three-hinge pre-cast concrete open-spandrel arch. Built using the Thomas method of arch construction.
Length of largest span: 146.0 ft.
Total length: 685.1 ft.
Deck width: 21.0 ft.
Eligible for the National Register of Historic Places
- Also called
- Yuba River Bridge
- Approximate latitude, longitude
- +39.22000, -121.33167 (decimal degrees)
39°13'12" N, 121°19'54" W (degrees°minutes'seconds")
- Approximate UTM coordinates
- 10/644019/4342516 (zone/easting/northing)
- Quadrangle map:
- Average daily traffic (as of 2009)
- Inventory numbers
- CA 16-11 (California bridge number)
BH 51216 (Bridgehunter.com ID)
- Inspection report (as of September 2017)
- Overall condition: Good
Superstructure condition rating: Good (7 out of 9)
Substructure condition rating: Good (7 out of 9)
Deck condition rating: Good (7 out of 9)
Sufficiency rating: 97.9 (out of 100)
View more at BridgeReports.com
- February 6, 2012: Added by Michael Goff
- Mike Goff - michael [dot] goff [at] hotmail [dot] com
- HAER CA-132 - Parks Bar Bridge, Spanning Yuba River at State Highway 20, Smartville, Yuba County, CA