Your First Clue your quarry is lost is a curve in the road...
When you see the road curve slightly before the bridge you're looking for, you can be pretty sure your target is gone.
Professor Kevin Patrick, of Indiana University of Pennsylvania says that when a straight road curves slightly, crosses a bridge, then gently curves back to the original alignment, the bridge is a replacement that was built next to its predecessor. Sadly, that's true here and I was too late to get the deck truss that was here.
Photo taken by J.R. Manning in July 2009
BH Photo #142420