File:T J OBrien Lock and Dam.jpg

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English: Aerial view of T.J. O’Brien Lock and Dam on the Calumet River, which is part of the Illinois Waterway. The dam is situated at river mile 326.5 on the Waterway (326.5 river miles up from the Mississippi River). T.J. O’Brien lock is the uppermost lock on the waterway, and there is not another barrier between the lock and Lake Michigan. There is very little elevation change in the lock, which serves mainly to regulate water flow from Lake Michigan into the waterway. The dam is located in Chicago, Illinois.
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Source U.S. Army Corps of Engineers Digital Visual Library
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Author Carol Arney, U.S. Army Corps of Engineers
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This image or file is a work of a U.S. Army Corps of Engineers soldier or employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.

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Location
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Chicago, Illinois, USA
Camera location41° 39′ 07.55″ N, 87° 34′ 01.84″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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current00:50, 3 April 2007Thumbnail for version as of 00:50, 3 April 20071,500 × 1,000 (279 KB)DanMS (talk | contribs){{Information | Description = {{en|Aerial view of T. J. O’Brien Lock and Dam on the Calumet River, which is part of the Illinois Waterway. The dam is situated at river mile 326 on the Waterway (326 river miles up from the Mississippi River). T.J. O�

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