Not too many years ago when I was a teenager, (1986 or so) this bridge still had the "draw" portion in place and the entire bridge was wooden. The bridge was open to traffic even though not all of the wood was in place. You would have to travel a piece, stop, get out, and move good wood from behind you to fill holes in front of you so you could advance a little more before repeating the process. A trip across the bridge took a good 15 - 30 minutes. The concrete portion was placed there in the late 80's or early 90's. Around this same time someone took a torch and cut the placard from the bridge...a dying shame!
This is definitely one of the coolest bridges I've ever come across.