Thomas J O'Brien Lock and Dam USGS Lake Calumet Quad, IL,IN, Topographic Map
Thomas J O'Brien Lock and Dam is a Dam in the state of (county of Cook), located at latitude - longitude coordinates (also known as lat-long or GPS coordinates) of N 41.65223 and W -87.56654. Thomas J O'Brien Lock and Dam is shown in the center of the topographic (topo) map, which is sourced from the United States Geographical Survey map USGS Lake Calumet quad. The nearest major town is Burnham, IL.
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