Uncredited photos on this page taken by: Nathan Holth. Unless stated in a caption, all photos are Copyright with All Rights Reserved. Learn about reuse of our photos.
View of lowest level of bridge tender house.
Middle levels of bridge tender house.
Top level of bridge tender house.
Stairways.
Views showing the large circular window.
Additional windows.
Riveted roof trusses as seen from top level.
Ceiling.
Riveted structural support beams.
Illinois brand on riveted structural support beams.
Looking south down Michigan Avenue from top level of bridge tender building.
Looking northbound up Michigan Avenue from top level of bridge tender building.
Looking down at the bridge deck from top level of bridge tender building.
Southeast bridge tender building as viewed from the top level of the southwest bridge tender building.
Overview of part of the room which is essentially the inside of the bridge and includes the drive system and the counterweight tail pit.
Bridge interior: View showing rack with gear in foreground.
Bridge interior: In the foreground is a gear that is part of the drive system that connects to the pinion. The rack and pinion are visible in the background through the hole in the big gear.
Views of the main trunnion.
Extra counterweight blocks being stored. Changes in the weight of the bridge due to repairs and other variable conditions sometimes require the adjustment of the counterweight system.
Detail photos showing the end of the bascule leaf which would include the counterweight.
View of the trusses leading up to the very end of the bascule leaf and counterweight.
Various views showing the gearing and braking system, located alongside the rack and pinion.
Views showing the very back of the room where the motors and additional gearing is located.
Exhibit, the old throttle control for controlling the speed during lifting and lowering the bridge.
Photo Credit: Historic American Engineering Record
Exhibit, additional bridge/electrical controls and meters.
Photo Credit: Historic American Engineering Record
Views inside operable bridge tender house control room.
Photo Credit: Historic American Engineering Record
Machinery basement.
Photo Credit: Historic American Engineering Record
Trunnion and trunnion girder.
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