T.J. O'Brien Lock and Dam (Chicago, Illinois)

USA / Illinois / Burnham / Chicago, Illinois
The O'Brien lock and dam is the uppermost barrier on the Illinois Waterway and the closest to Lake Michigan. Its main purpose is to control flow of lake waters into the waterway, rather than to raise or lower vessels (the elevation difference across the lock is minimal).
Wikipedia article: http://en.wikipedia.org/wiki/Illinois_Waterway
Nearby cities:
Coordinates:   41°39'6"N   87°34'1"W

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  • Photo is public domain (from U.S. Army Corps of Engineers Digital Visual Library).
This article was last modified 2 years ago