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Lockport

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Lockport Historic District, Chicago Sanitary & Ship Canal, Butterfly Dam, Lockport, Will County, IL



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Item Title
Lockport Historic District, Chicago Sanitary & Ship Canal, Butterfly Dam, Lockport, Will County, IL

Location
Butterfly Dam, Lockport, IL

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Created/Published
Documentation compiled after 1968.

Notes
Survey number HAER IL-16-C
Building/structure dates: 1903 initial construction
Significance: The Butterfly Dam was constructed in the middle of the Chicago Sanitary and Ship Canal for the purpose of providing flood protection for Joliet and other points on the canal west of Lockport. The dam is unique in that it is suspended from a Pratt truss bridge which is supported by two concrete piers. The dam is on a pivoting mechanism, so it can be turned to cross the canal and block the flow of water. It is 30 feet high, and has six electrically operated valves on each leaf. The need to use the dam for flood prevention seems never to have arisen.

Subjects
Canals
Civil Engineering
Flood Control


Related Names
Randolph, Isham
Chicago Sanitary Commission


Collection
Historic American Engineering Record (Library of Congress)

Contents
Photograph caption(s): 
1. View of the Chicago Sanitary and Ship Canal Butterfly Dam from the north
2. General view of the butterfly dam
3. North end of the butterfly dam showing stone abutment
4. Center section of the dam showing the pivoting mechanism
5. South end of the butterfly dam
6. View of the south end of the dam looking northwest with Lockport visible in the background


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