Yep, that's it. I'll check, but I would bet that my shot is about the same as yours.
Hey, Ed, why don't you ask one of the CRHS cronies in Marysville to run out in the backyard and shoot that very tunnel or retaining wall for you? Otherwise, with some time, I might be able to shoot a straight-on, close-up pic of a single-arch stone bridge in Newark, Del. on the Northeast Corridor or possibly a retaining wall near the Susquehanna River bridge. Lemme know.
EDIT: My shot of that marble plaque looks identical to yours, Lee. Oh well...