Bridges - 44 and counting

On the Intercoastal Waterway between Mile 1 in Virginia and Key West in Florida there are a total of 191 bridges of assorted design:  bascule, float, swing, train, lift and free standing. 
During our travels from Mile 1 in Virginia to the Georgia/Florida border we've passed through 44 bridges.  Florida, between the Georgia border and Key West has a total of 147 bridges. Some of them we simply float under while others we need to contact the bridge operator on the VHF radio and ask for an opening.  We've waited up to an hour at times, but most open more frequently or on request.
Some of the bridges are doubled....one for traffic, one for trains.