1880s+1915 UP/Central Pacific Bridges over Long Ravine near Colfax, CA (BoB)

1915: (Bridge Hunter; Satellite)

BoB = Bridge on Bridge so that later I can find these more easily.

Marc Mcgowan posted

A double headed Central Pacific train passes 113 feet over a Nevada County Narrow Guage train at the 880 foot Long Ravine Trestle near Colfax, Ca. about 1880.

This trestle was replaced by a steel viaduct about 1915.

(SP collection)

Marc Mcgowan posted
Jeff Lewis: I've seen this image before but never noticed the train below.

BridgeOfWeek via BridgeHunter, License: Creative Commons Attribution-NonCommercial-ShareAlike (CC BY-NC-SA)

There are several more photos of the wood bridge here (scroll to the bottom).

Thomas Houseworth & Company
Section of Long Ravine Trestle Bridge - from below; 120 feet high., about 1872, Albumen silver print
84.XC.979.4694
The J. Paul Getty Museum, Los Angeles, Gift of Weston J. and Mary M. Naef

I presume one of these trestle bridges were built in 1915 and the second one was built later when more capacity was needed. We are looking at the southern trestle. 

Street View, Mar 2021

This photo shows that the southern trestle is the older one because the truss members are built with lacing. It was modified with the concrete piers and deeper girders to remove a steel tower to make room for the highway. If the second trestle was built before I-80 was built, they at least knew were I-80 was going to be so they designed the spacing of the steel towers so that towers were next to the highway and the span was shorter. They then used the depth of the girders needed to span I-80 in the girders across the towers. That seems to be overkill and a waste of steel.

Photo by Craig Philpott, Jan 2010 via BridgeHunter

Even thought the outside was solid, the inside of the bents used lacing. That is an interesting hybird.

Street View