I guess I can respond, since I was raised on McCullough arches and have been expanding my truss knowledge since joining you folks in 2005. 3 rib open spandrel deck arch, for sure.
A real gem!.......hidden under the ruse of the ugly replacement railing.
Being raised on trusses and with limited knowledge of concrete arches leads me to ask...... Would this not be considered a 3-ribbed open-spandrel arch?
I was on vacation in this part of TN last week and drove right over this bridge. Sure wish I'd checked here first, so I would have known to pull over and find a place to climb down the bank so I could see this for myself!!
I have driven or ridden over this bridge for the past 50 years, and had no idea how elegant the structure is just below the railing. Very impressed with the '78 renovations, too...the sculptured lines of the spandrels are very elegant. Obviously, too deep for support piers, unlike the railroad bridge beside it. It is a hidden jewel, unseen as you approach and cross it. Well worth the trip (and the mosquito bites) to see it.
Thanks for fixing that, Michael!