Photo taken by Steven Miller
License: Creative Commons Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)
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BH Photo #241910
Great photos, Craig.
I just thought it was a polygonal Warren at first...But I do agree that it indeed a Pegram with inclined verticals as apposed to being all diagonal members.
Good eye on that one Clark!
There is a good photo over on panoramio of this bridge and yes, the top chord segments do appear to be the same length. Interesting.
It's hard to tell the length of the segments in the top chord but might this be a Pegram Truss?
Other remarks on the web suggest this is abandoned from an old electric trolly system in the region. This would make sense since the width is less then a standard gauge single track bridge. There is also a photo accessible through street view on google maps that indicates this bridge is an interesting design with a curved top chord and tilted compression members. None of the "vertical" compression members are exactly vertical but rather are tilted toward the center.
Santa Ana River Trail is on both sides of this bridge...looks like this would be a perfect way to connect them!