WELLS OF BOONE COUNTY, ILLINOIS. 573 



30 feet. In the neighboring section on the north there are several outcrops 

 of limestone, though one well in that section fails to reach rock at 106 feet. 

 A well in sec. 1, T. 26, R. 10, 114 feet in depth, enters rock at 50 feet. 



In the northwestern one-fourth of the county rock is usually entered at 

 slight depth except in a narrow belt along the Pecatonica and Sugar rivers. 

 But here, as in the southwestern portion of the county, occasional wells on 

 the upland reach a depth of 80 feet or .more before entering rock. 



BOONE COUNTY. 

 GENERAL STATEMENT. 



Boone County is situated immediately east of Winnebago County, on 

 the north border of the State, and has an area of but 290 square miles. 

 Belvidere, the county seat, is situated near the southern edge of the county 

 It is drained chiefly by the Kishwaukee and its tributaries, which occupy 

 gravel plains leading westward from the moraines of the Wisconsin drift 

 sheet in McHemy County. These gravel plains are in places a mile or 

 more in width and afford an abundance of water at shallow depth, wells 

 seldom exceeding 25 feet. 



The drift is thinnest in the southern portion of the county, there being 

 numerous quarries in the two townships on its south border. In the north- 

 ern part of the county the drift is probably not less than 75 feet in average 

 depth, and it may possibly be as deep as in the neighboring portion of 

 Winnebago County, from which the list of wells in the above table was 

 prepared. Water is usually obtained at depths of 30 or 40 feet in that 

 portion of the county from beds of gravel or sand associated with the till, 

 the greater part of the drift being a typical till. In this county the glacial 

 drift with its bowlders is not covered by deposits of loess or other silt as in 

 counties to the west, and the surface sheet of drift, like that of eastern 

 Winnebago County, is referred to the Iowan stag-e of glaciation. 



INDIVIDUAL WELLS. 



The city of Belvidere obtains its public water supply from a well 

 sunk to a depth of 1,950 feet. The well is cased only to the limestone, 

 58 feet, and water is found at several horizons above the Potsdam (in which 

 the well terminates) as well as in that formation. The head is but 6 feet 

 below the well mouth, or 757 feet above tide. Though only 4 inches in 

 diameter in its lower portion, it is found to have a capacity of 400 gallons 

 per minute. The hardness 



