During my wildlife spotting tours along the Mississippi I visit frequently Sabula, Iowa’s only island city. Beside the road bridge and causeway that connects Sabula and Savannah, Illinois there is also the Sabula Rail Bridge. This wonderful single track swing bridge was opened in 1906. During the winter, with no barge traffic, the bridge was always open for the railroad. Last weekend I saw it in its other position, open for the boats. Both sides of the pivot point are navigable. The swing span of the bridge is 364 ft (~111 m) long.
The photo shows also that the Mississippi is relatively clear at the moment. The water we see is mostly from the snow melt up north and therefor not so muddy as after heavy rain sometime.