WELLS OF OGLE COUNTY, ILLINOIS. #05 



direction. It is filled nearly to the level of the bluffs, and judging by the 

 distance to rock in portions of the valley to the north and south, there is 

 probably not less than 400 feet of drift filling. Along the present course 

 of Rock River there are continuous bluffs rising to heights varying from 

 75 up to fully 200 feet. 



On the uplands, in fully three-fourths of the county, wells commonly 

 enter the rock at 10 to 40 feet, and obtain water at depths ranging from 50 

 feet up to about 300 feet. Along the lines of preglacial valleys water is 

 usually obtained at a shallow depth/in gravel. There are belts of gravelly 

 drift of esker type in the western part of this county similar to those in 

 Stephenson County on the north, and with a similar east to west trend. 

 Aside from these gravelly strips the drift is usually a compact till. There are, 

 however, as in Stephenson and Winnebago counties, many places where it 

 is made up largely of coarse stony material. In the portion outside the 

 Wisconsin drift there are two drift sheets of widely different age. The 

 later of these, the Iowan, appears to extend but little west of Rock River, 

 thus leaving only the Illinoian, in the western part of the county, unless a 

 sheet older than Illinoian is found to be present. 



INDIVIDUAL AVELLS. 



In the northwest part of the county, in the vicinity of Foreston, a till 

 sheet 30 to 40 feet in thickness is generally present. Some of the wells are 

 obtained without entering the rock, but the stronger wells are usuallv 

 drilled into the limestone. The public water supply at Foreston is obtained 

 from a well 300 feet in depth, in which water rises within 20 feet of the 

 surface. The private wells are 35 to 80 feet in depth. 



At Mount Morris the public supply is from a well 502 feet in depth, 

 whose head is nearly 200 feet below the surface and near the top of the St. 

 Peter sandstone. 



At Adeline the drift is gravelly, the village being situated on a plexus 

 of knolls and ridges associated with an esker which leads westward along 

 Leaf River. Wells here obtain water at depths of 30 to 75 feet in gravel. 



At Hazelhurst, on the west border of the county, there is an esker in 

 which a well was sunk to a depth of 135 feet before striking rock, though 

 the well mouth is 50 feet below the highest part of the esker. Between 



