Morgan Chapel Road Bridge
Looking south
Photo taken by Michael Miller in September 2013
View this photo at panoramio.com
BH Photo #265888
The truss bridge was listed as built in 1920 and rehabilitated in 1961. The current bridge is indeed a pre-stressed concrete box beam. Trusses likely placed as decorations as mitigation for Section 106. While this is not a form of preservation, for a Section 106 mitigation, I consider this a good outcome since some original bridge material is saved.
Agree. Concrete box beam, with 1930's or so warren pony truss webs an decoration. I suspect it was a "compromise", allowing the engineer to use a "safe" concrete span, but quiet the noise from the folks wishing their truss bridge was still there. A mutt bridge.
You nailed it. The trusses are decorative. It might be a box beam from the looks of the underside.
I will preface this by saying that I'm not an engineer, but do not believe this is a truss bridge. Does it have trusses? Yes. There used to be a truss bridge here. I know this because I have crossed it before, but they demolished the truss bridge & built this new bridge just a few years ago. It appears as if they kept the steel from the old truss bridge & incorporated it into the design so that it is strictly ornamental and not structural. This is actually a concrete stringer bridge now. I tried doing some online research, but I couldn't find anything relating to the construction of this bridge.
Perhaps a real engineer or someone who knows more about bridges than I do can look at the pictures I've added and either confirm or deny my theory.
And this replacement bridge actually had some thought put into it. Instead of just slapping the trusses on a slab they really did a good job with the overall design and made them stand out nicely.
Not as good as rehabilitating the truss bridge itself... but better than nothing.