2 votes

Mt Murphy Road Bridge


Mt. Murphy Road Bridge

from the north

Photo taken by Michael Goff on March 13, 2009


BH Photo #135608

Street Views 


Through truss bridge over South Fork American River on Mt Murphy Road
Coloma-Lotus, El Dorado County, California
Open to traffic
Future prospects
At risk for demolition. Project development, with study to determine whether to rehabilitate or replace, is underway.
Through girder bridge built 1915, 2 center spans destroyed by flooding and truss installed 1931
- American Bridge Co. of New York (Truss Fabricator)
- D.M. Bassi
- H. Williamson (Contractor)
- Henry Lahiff of County Galway, Connach, Republic of Ireland (Engineer)
Main span: Pin-connected, 9-panel Pratt through truss
Length of largest span: 162.1 ft.
Total length: 488.9 ft.
Deck width: 10.5 ft.
Vertical clearance above deck: 13.7 ft.
Eligible for the National Register of Historic Places
Also called
Coloma Bridge
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:
Average daily traffic (as of 2012)
Inventory numbers
CA 25C-4 (California bridge number)
BH 10870 (Bridgehunter.com ID)
Inspection report (as of July 2018)
Overall condition: Fair
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Fair (5 out of 9)
Deck condition rating: Fair (5 out of 9)
Sufficiency rating: 20.6 (out of 100)
View more at BridgeReports.com

Update Log 

  • September 29, 2021: Updated by Nathan Holth: Added truss builder per plaque photo.
  • 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



Mt Murphy Road Bridge in the News
Posted September 27, 2021, by Jose Luis Caceres (jlplusdiana [at] hotmail [dot] com)

The bridge got damaged by a truck 9/25/2021 and it's closed 2-6 months.


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.