4. Center section of the dam showing the pivoting mechanism - Lockport Historic District, Chicago Sanitary & Ship Canal, Butterfly Dam, Lockport, Will County, IL

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Prints & Photographs Online Catalog

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4. Center section of the dam showing the pivoting mechanism - Lockport Historic District, Chicago Sanitary & Ship Canal, Butterfly Dam, Lockport, Will County, IL

Digital ID: (None) hhh il0434.photos.064240p http://hdl.loc.gov/loc.pnp/hhh.il0434/photos.064240p
Reproduction Number: HAER ILL,99-LOCK,3A--4
Repository: Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA http://hdl.loc.gov/loc.pnp/pp.print

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4. Center section of the dam showing the pivoting mechanism - Lockport Historic District, Chicago Sanitary & Ship Canal, Butterfly Dam, Lockport, Will County, IL