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Chicago River Bascule Bridge, Grand Avenue, Spanning North Branch Chicago River at Grand Avenu, Chicago, Cook County, IL



B&W Photos


Data Pages


Photo Caption Pages


Item Title


Location
Spanning North Branch Chicago River at Grand Avenu, Chicago, IL

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Created/Published
Documentation compiled after 1968.

Notes
Survey number HAER IL-139
Building/structure dates: 1913 initial construction
Significance: The Grand Avenue Bridge represents the "second generation" of the Chicago bascule bridge with improvements executed in the design of the counterweights, a new rack-and-pinion assembly (namely, the use of an internal rack, instead of an external rack that extended along the truss superstructure's upper chords), and a steel pony truss superstructure.

Subjects
Bascule Bridges


Related Names
Strobel Steel Construction Company
Fitzsimons & Connell Dock & Dredge Company
Fitzsimons, Gray, Historian


Collection
Historic American Engineering Record (Library of Congress)

Contents
Photograph caption(s): 
1. GENERAL VIEW OF BRIDGE, LOOKING NORTH
2. DETAIL OF BUILDER'S PLATE: 'SUPERSTRUCTURE BUILT BY STROBEL STEEL CONSTRUCTION CO., CHICAGO, ILL., 1913, SUBSTRUCTURE BUILT BY FITZSIMONS & CONNELL D&D CO., CHICAGO, ILL.'
3. DETAIL OF UPPER CHORD AND RIVETED GUSSET PLATE CONNECTION
4. DETAIL OF COUNTERWEIGHT INSIDE THE BRIDGE ABUTMENT
5. VIEW OF ELECTRIC MOTOR THAT POWERS GEARS FOR LIFTING THE BRIDGE
6. DETAIL OF RACK AND PINION GEAR
7. INTERIOR VIEW OF BRIDGETENDER'S HOUSE


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