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

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Historic American Buildings Survey/Historic American Engineering Record/Historic American Landscapes Survey

7 b&w photos
2 data pages
1 photo caption pages

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

CALL NUMBER:
HAER ILL, 16-CHIG, 125-

REPRODUCTION NUMBER:
[See Call Number]

MEDIUM:
Photo(s): 7 (5 x 7 in.)
Data Page(s): 1 plus cover page
Photo Caption Page(s): 1

DATE:
Documentation compiled after 1968.

CREATOR:
Historic American Engineering Record, creator

NOTE:
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:
ILLINOIS--Cook County--Chicago
bascule bridges

COLLECTION:
Historic American Engineering Record (Library of Congress)

REPOSITORY:
Library of Congress, Prints and Photograph Division, Washington, D.C. 20540 USA

DIGID:
http://hdl.loc.gov/loc.pnp/hhh.il0761

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

CONTROL #:
IL0761

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