Rating:
2 votes

Mt Murphy Road Bridge

Photos 

Mt. Murphy Road Bridge

from the north

Photo taken by Michael Goff on March 13, 2009

Enlarge

BH Photo #135608

Map 

Street Views 

Facts 

Overview
Through truss bridge over South Fork American River on Mt Murphy Road
Location
Coloma-Lotus, El Dorado County, California
Status
Open to traffic
Future prospects
At risk for demolition. Project development, with study to determine whether to rehabilitate or replace, is underway.
History
Through girder bridge built 1915, 2 center spans destroyed by flooding and truss installed 1931
Builders
- D.M. Bassi
- H. Williamson (Contractor)
- Henry Lahiff of County Galway, Connach, Republic of Ireland (Engineer)
Design
Main span: Pin-connected, 9-panel Pratt through truss
Dimensions
Length of largest span: 162.1 ft.
Total length: 488.9 ft.
Deck width: 10.5 ft.
Vertical clearance above deck: 13.7 ft.
Recognition
Eligible for the National Register of Historic Places
Approximate latitude, longitude
+38.80155, -120.89055   (decimal degrees)
38°48'06" N, 120°53'26" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/683178/4296868 (zone/easting/northing)
Quadrangle map:
Coloma
Inventory numbers
CA 25C-4 (California bridge number)
BH 10870 (Bridgehunter.com ID)
Inspection (as of 07/2014)
Deck condition rating: Satisfactory (6 out of 9)
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Good (7 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 13.5 (out of 100)
Average daily traffic (as of 2012)
284

Update Log 

  • May 1, 2016: New photos from Erik Hoffman
  • May 24, 2013: New Street View added by Craig Philpott
  • May 21, 2013: Updated by Nathan Holth: This bridge is at risk for demolition.
  • November 27, 2011: Removed duplicate listing
  • November 27, 2011: New photos from Craig Philpott
  • March 30, 2010: Updated by Craig Philpott: updated status and name
  • March 4, 2010: New photo from Larry Matthews
  • March 3, 2010: Updated by Joshua Collins: added gps coordinates and road name
  • March 2, 2010: Added by Larry Matthews
  • March 17, 2009: New photos from Michael Goff

Sources 

Comments 

Mt Murphy Road Bridge
Posted November 28, 2011, by Michael Goff (michael [dot] goff [at] hotmail [dot] com)

I agree Craig. The hypothesis I came up with is that the concrete through girder used to continue all the way across the river, until the pre-mentioned flooding event took it out (probably scoured out a mid river pier). Then the truss was more than likely installed later to clear span the normal river channel.

Mt Murphy Road Bridge
Posted November 27, 2011, by Craig Philpott (cphilpott [at] puc [dot] edu)

Five different construction plaques on bridge with three different years listed. Builders plaque on steel work on each end of bridge indicates 1915 construction date. County engineers plaque above South portal indicates 1916 year. Two plaques set in concrete on South approach less then 20 feet apart indicate 1931 on one plaque and 1936 on the other plaque. I suspect that this same 1915 truss has been re-installed in this location on multiple concrete piers after various historical flood episodes.