This is a really neat structure. It’s actually a truss bridge. Truss bridges are composed of structures that connect in triangular units. They are one of the oldest types of modern bridges. Most truss bridges were built from the 1870’s through the 1930’s. This one was built in 1926 and reconstructed in 1960, according to uglybridges.com.
There are lots of hiding places on a bridge. I hope you enjoy searching for this cache. You are looking for small magnetic cache container.
Enjoy the view & Watch Your Step!