WELLS OF KENDALL COUNTY, ILLINOIS. 643 



KENDALL COUNTY. 

 GENERAL STATEMENT. 



Kendall is a small county, with an area of but 330 square miles, sit- 

 uated east of the northern part of Lasalle and the southern part of Dekalb 

 County, with Yorkville as the county seat. Fox River crosses its north- 

 western portion in a southwestward course, and nearly half the county is 

 tributary to it, The remainder of the county drains southeastward directly 

 to the Illinois River through Aux Sable Creek and smaller streams. 



The Marseilles moraine traverses this county centrally from northeast 

 to southwest, following- the southeast border of Fox River Valley, or rather 

 Fox River Valley follows the outer border of this moraine, the course of 

 the stream being- determined by the moraine. The remainder of the county 

 has a plane surface, except the east border, which is occupied bv the 

 Minooka till ridge. The drift is of moderate thickness, averaging probably 

 100 feet. A small area in the southern part is very thinly coated and there 

 are numerous rock outcrops along the Fox River Valley. The heaviest 

 drift, apparently, is along the line of the Marseilles moraine, where, as 

 shown in the table below, the thickness usually exceeds 150 feet. 



An extensive gravelly area occupies townships bordering Fox River. 

 The gravel extends usually as deep as wells have penetrated, and may con- 

 tinue to the underlying rock. The remainder of the count}' outside the 

 moraine apparently has much sand a,nd gravel in the lower part of the drift. 

 The Marseilles moraine and the plain to the southeast are characterized by 

 a heavy sheet of till, though there are limited areas in which wells pene- 

 trate a large amount of sand or gravel. The Minooka Ridge, also, is com- 

 posed largely, of till. Wells are ordinarily obtained in this county at depths 

 of 25 to 35 feet. The deeper ones are largely found along the Marseilles 

 and Minooka ridges. 



INDIVIDUAL WELLS. 



At Piano, in the northwest part of the county, several wells reach a 

 depth of 45 feet without entering rock, and are mainly through sand and 

 gravel. The public water supply is from a well. 1 North of this village 

 for 2 or 3 miles wells usually penetrate about 20 feet of till and then enter 

 sand and gravel, in which they terminate at depths of 40 or 50 feet. One 



1 Manual of American Waterworks. 18117. 



