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Photos: Michigan Avenue Bridge

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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.

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View of lowest level of bridge tender house.

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Middle levels of bridge tender house.

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Top level of bridge tender house.

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Stairways.

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Views showing the large circular window.

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Additional windows.

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Riveted roof trusses as seen from top level.

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Ceiling.

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Riveted structural support beams.

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Illinois brand on riveted structural support beams.

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Looking south down Michigan Avenue from top level of bridge tender building.

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Looking northbound up Michigan Avenue from top level of bridge tender building.

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Looking down at the bridge deck from top level of bridge tender building.

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Southeast bridge tender building as viewed from the top level of the southwest bridge tender building.

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Overview of part of the room which is essentially the inside of the bridge and includes the drive system and the counterweight tail pit.

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Bridge interior: View showing rack with gear in foreground.

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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.

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Views of the main trunnion.

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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.

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Detail photos showing the end of the bascule leaf which would include the counterweight.

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View of the trusses leading up to the very end of the bascule leaf and counterweight.

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Various views showing the gearing and braking system, located alongside the rack and pinion.

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Views showing the very back of the room where the motors and additional gearing is located.

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Exhibit, the old throttle control for controlling the speed during lifting and lowering the bridge.

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Photo Credit: Historic American Engineering Record

Exhibit, additional bridge/electrical controls and meters.

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Photo Credit: Historic American Engineering Record

Views inside operable bridge tender house control room.

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Photo Credit: Historic American Engineering Record

Machinery basement.

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Photo Credit: Historic American Engineering Record

Trunnion and trunnion girder.

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