BOS votes to “dismiss” any further study of rehabilitating the Mt. Murphy bridge and look to Fed Funds to replace “structural deficiency and structural obsolescence” Mt. Murphy bridge. The vote, in effect, scraps any notions of trying to keep the bridge as a viable structure to provide the service for which it was intended. Even if they bridge is not to be used by vehicles, it may be saved as a pedestrian/bike bridge with the new vehicular bridge built elsewhere.
Chris Daley | Feb 12 2014
The Feb. 4 Board of Supervisors afternoon agenda focused on the “bridges of El Dorado County” — specifically Mt. Murphy and Bucks Bar bridges... Mt. Murphy Road Bridge crosses the South Fork of the American River at Coloma in the Gold Discovery Park...
Federal Highway Administration funds could provide 100 percent of the money to replace the Mt. Murphy bridge, Smeltzer said...
Supervisors voted unanimously to accept the DOT recommendation to “dismiss” any further study of rehabilitating the Mt. Murphy bridge...
The work would further require motorists to use a more-than-20-mile detour...
Supervisor Brian Veerkamp added a caveat to his motion to accept the DOT recommendations. If financially and structurally feasible, the county would like to retain the old structure as a pedestrian/cycling bridge. The span connects visitors over the river to the Coloma Resort and to the Marshall Gold Discovery State Park but is not a part of either of those entities. Smeltzer noted that rehabbing the bridge for that purpose would cost the county about $1.7 million as federal funding would not cover that kind of work, but that project could retain the bridge within the state’s historical classification as the work would not be nearly as extensive as full rehabilitation...
Former DOT engineer and current president of the county’s Historical Society Kris Payne noted that building a new bridge on the exact location could pose significant problems in the state park by jeopardizing sensitive buildings which could not withstand the “vibrations” from heavy construction equipment. “We should be looking for a location for a new bridge,” he concluded...
Board Chairwoman Norma Santiago revisited an issue raised by Melody Lane, whose property adjoins the state park and is directly affected by the bridge and the road. Lane expressed grave concern for provision of an evacuation route that would allow residents to get out in case of fire or other emergency. She described an incident when a large recreational vehicle got stuck on the bridge temporarily preventing residents and emergency vehicles (had there been an emergency) from crossing the river. Santiago noted that an evacuation plan would have to be part of any analysis and future planning.
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
Approximate latitude, longitude
+38.80155, -120.89055(decimal degrees) 38°48'06" N, 120°53'26" W (degrees°minutes'seconds")
Approximate UTM coordinates
USGS topographic map
CA 25C-4 (California bridge number) BH 10870 (Bridgehunter.com ID)
Inspection (as of 01/2011)
Deck condition rating: Poor(4 out of 9) Superstructure condition rating: Fair(5 out of 9) Substructure condition rating: Good(7 out of 9) Appraisal: Structurally deficient Sufficiency rating: 0.0 (out of 100)
Average daily traffic (as of 2009)
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
Mike Goff - michael [dot] goff [at] hotmail [dot] com
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.