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Watersheds of Illinois is a list of basins or catchment areas into which the State of Illinois can be divided based on the place to which water flows.. At the simplest level, in pre-settlement times, Illinois had two watersheds: the Mississippi River and Lake Michigan, with almost the entire State draining to the Mississippi, except for a small area within a few miles of the Lake.
The Illinois side includes Henry County, Mercer County, and Rock Island County. [4] In extreme northwestern Illinois the Driftless Zone, a region of unglaciated and therefore higher and more rugged topography, occupies a small part of the state. Charles Mound, located in this region, is the state's highest elevation above sea level.
The aquifer underlies 1,260,000 acres (510,000 hectares) of land in east-central Illinois and spans 15 counties (Panno and Korab, 2000). The Mahomet ranges from 4 to 15 miles (6 to 24 km) and 50 to 200 feet (15 to 60 m) thick, although the average thickness is 100 feet (30 m).
Bodies of water of Cook County, Illinois (2 C, 3 P) Bodies of water of Crawford County, Illinois (1 C) Bodies of water of Cumberland County, Illinois (1 C, 1 P)
A plot of sugarcane yield versus depth of water table in Australia. The critical depth is 0.6 m. [4] [5] Most crops need a water table at a minimum depth. [6] For some important food and fiber crops a classification was made [7] because at shallower depths the crop suffers a yield decline. [8]
Salt Creek is a major tributary to the Sangamon River, which it joins at the boundary between Mason and Menard County, Illinois. [2] There are at least two other Salt Creeks in Illinois, Salt Creek (Des Plaines River Tributary), and in Effingham County, Illinois. Salt Creek is about 110 miles (180 km) in length. [3]
The Vermilion River is a 74.8-mile-long (120.4 km) [2] tributary of the Illinois River in the state of Illinois, United States. [3] The river flows north, in contrast to a second Vermilion River in Illinois, which flows south to the Wabash River. The Illinois and Wabash rivers each have a tributary named the Little Vermilion River as well.
Devil's Kitchen Lake is an 810-acre (3.3 km 2) reservoir in southern Illinois, created by the damming of Grassy Creek, a tributary of Crab Orchard Lake and the Big Muddy River. Most of the lake is located in Williamson County, southwest of Marion, Illinois. The lake is accessible from Interstate 57.