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File:VIEW OF WESTERN BRIDGE PORTAL, LOOKING EAST - Chicago River Bascule Bridge, West Cortland Street, Spanning North Branch of Chicago River at West Cortland Street, Chicago, Cook HAER ILL, 16-CHIG, 136-2.tif

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VIEW OF WESTERN BRIDGE PORTAL, LOOKING EAST - Chicago River Bascule Bridge, West Cortland Street, Spanning North Branch of Chicago River at West Cortland Street, Chicago, Cook County, IL
Title
VIEW OF WESTERN BRIDGE PORTAL, LOOKING EAST - Chicago River Bascule Bridge, West Cortland Street, Spanning North Branch of Chicago River at West Cortland Street, Chicago, Cook County, IL
Description
Chicago Department of Transportation; Ericson, John; Chicago Department of Transportation, sponsor; Daley, Richard M, sponsor; Walker, Thomas R, sponsor; Kaderbek, S L, sponsor; Fitzsimons, Gray, transmitter; Lowe, Jet, photographer; Fitzsimons, Gray, historian
Depicted place Illinois; Cook County; Chicago
Date Documentation compiled after 1968
Dimensions 5 x 7 in.
Current location
Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA http://hdl.loc.gov/loc.pnp/pp.print
Accession number
HAER ILL, 16-CHIG, 136-2
Credit line
This file comes from the Historic American Buildings Survey (HABS), Historic American Engineering Record (HAER) or Historic American Landscapes Survey (HALS). These are programs of the National Park Service established for the purpose of documenting historic places. Records consist of measured drawings, archival photographs, and written reports.

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Notes
  • Significance: Designated a landmark by the American Society of Civil Engineers, the Cortland Street Bridge is a double-leaf bascule span that became in the early twentieth century the standard for movable bridges designed by the city engineer of Chicago. The Cortland Street bridge was the first of this type and featured electric motors that drove pinion gears which engaged a rack attached to the end of each truss. Counterweights on the shore sides of the bridge counterbalanced the roadway and superstructure that spanned the river and thus little power was required to raise or lower the bridge. When raised, each leaf assumed a nearly vertical position providing a wide clearance for vessels plying the river. City engineers designed the machinery so that the bridge could open within one minute during calm weather and under three minutes during windy conditions.
  • Survey number: HAER IL-138
  • Building/structure dates: 1901 Initial Construction
Source https://www.loc.gov/pictures/item/il0760.photos.048660p
Permission
(Reusing this file)
Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.

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current11:37, 17 July 2014Thumbnail for version as of 11:37, 17 July 20145,000 × 3,531 (16.84 MB)Fæ (talk | contribs)GWToolset: Creating mediafile for Fæ. HABS 16 July 2014 (1201:1400)

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Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:VIEW_OF_WESTERN_BRIDGE_PORTAL,_LOOKING_EAST_-_Chicago_River_Bascule_Bridge,_West_Cortland_Street,_Spanning_North_Branch_of_Chicago_River_at_West_Cortland_Street,_Chicago,_Cook_HAER_ILL,_16-CHIG,_136-2.tif&oldid=283280695"