
The Illinois River and Sangamon River converge in this detailed topographic record, defining a landscape dominated by complex waterways and river-bottom agriculture. At the heart of the sheet lies Grand Island, separated from the mainland by the East Branch and surrounded by a network of named backwaters including Swan Lake, Moscow Lake, and Jack Lake. The interaction between the natural river systems and early 20th-century engineering is evident in the presence of several pumping stations and drainage features like the Snicarte Slough.
126 named features on this map. Tap any name to fly to it.
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