Rating:
1 vote

West Walker River Bridge

Photos 

West Walker River

Photo taken by Craig Philpott

Enlarge

BH Photo #199976

Map 

Facts 

Overview
Glue laminated timber arched Pratt pony truss bridge over West Walker River on Cunningham Lane
Location
Mono County, California
Status
Open to traffic
History
Built 1951
Design
Laminated wood arched Pratt pony truss with concrete abutments.
Dimensions
Length of largest span: 80.1 ft.
Total length: 83.0 ft.
Deck width: 20.0 ft.
Approximate latitude, longitude
+38.57972, -119.50667   (decimal degrees)
38°34'47" N, 119°30'24" W   (degrees°minutes'seconds")
Approximate UTM coordinates
11/281649/4273119 (zone/easting/northing)
Quadrangle map:
Coleville
Elevation
5085 ft. above sea level
Average daily traffic (as of 2009)
82
Inventory numbers
CA 47C-12 (California bridge number)
BH 48007 (Bridgehunter.com ID)
Inspection report (as of July 2017)
Overall condition: Poor
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Fair (5 out of 9)
Deck condition rating: Poor (4 out of 9)
Sufficiency rating: 43.7 (out of 100)
View more at BridgeReports.com

Categories 

Built 1951 (274)
Built during 1950s (3,714)
California (2,338)
Mono County, California (5)
Open (38,824)
Owned by county (20,253)
Pony truss (15,854)
Pratt pony truss (3,534)
Pratt truss (8,948)
Span length 75-100 feet (6,275)
Total length 75-100 feet (6,433)
Truss (31,772)

Update Log 

  • May 30, 2011: Updated by Craig Philpott: refined design description and added elevation
  • May 29, 2011: New photos from Craig Philpott
  • February 5, 2011: Added by J.P.

Sources 

  • J.P. - wildcatjon2000 [at] gmail [dot] com
  • Craig Philpott - craigphilpott63 [at] gmail [dot] com

Comments 

West Walker River Bridge
Posted May 31, 2011, by Michael Goff (michael [dot] goff [at] odot [dot] state [dot] or [dot] us)

"Parker Pony" is probably the best answer. I think we might have a three-hinged timber tied arch with a Pratt configured hanger-stiffening system. It appears that the arch ribs are made of two large curved timbers, spliced at the crown and "tied" with the bottom chord. I maybe streching here but its a thought.

West Walker River Bridge
Posted May 31, 2011, by Robert Elder (robertelder1 [at] gmail [dot] com)

Interesting, my first reaction was "Parker pony".

West Walker River Bridge
Posted May 31, 2011, by Michael Goff (michael [dot] goff [at] odot [dot] state [dot] or [dot] us)

Agreed, this truss is definitely a Pratt configuration. Excellent work again Craig, it is nice to see some more photos from my neighbor to the south.

West Walker River Bridge
Posted May 29, 2011, by Tony Dillon (spansaver [at] hotmail [dot] com)

Looks like a Pratt to me as well Craig.....with the diagonals overlapping in the center panel to form the X.

Certainly don't see anything here to suggest a Warren.

West Walker River Bridge
Posted May 29, 2011, by Craig Philpott (cphilpott [at] puc [dot] edu)

The description for this bridge lists the design as polygonal warren truss. It seems to me this is an arched pratt truss design. I am interested in receiving design comments from others.

West Walker River Bridge
Posted February 5, 2011, by Anthony Dillon (spansaver [at] hotmail [dot] com)

What a unique span......and an amazing photograph!

Nice find on this one J.P.!!

West Walker River Bridge
Posted February 5, 2011, by Craig Philpott (cphilpott [at] puc [dot] edu)

JP, fantastic find. I will make a serious effort to get out that way and photograph this bridge this year. I have driven by this junction many times and did not know about this bridge.

West Walker River Bridge
Posted February 5, 2011, by J.P.