WELLS OF LASALLE COUNTY, ILLINOIS. 



639 



Streator, a city located on the southern border of the county, obtains 

 its public supply by pumping from Vermilion -River. Many private wells 

 are obtained at depths of 20 to 40 feet, from gravel in the drift. An artesian 

 well was sunk in this city to a depth of 2,496 feet, terminating in the 

 Potsdam sandstone. Water was struck in the St. Peter sandstone at 450 

 feet, which has a head 578 feet above tide, or 40 feet below the surface. 

 In the Lower Magnesian strata the head was increased a few feet, and in 

 the Potsdam, at 2,170 to 2,496 feet, water was struck which has a head 

 45 feet above the surface, or 663 feet above tide. A section of this well 

 and also of the deepest well at Ottawa has been published in the Seven- 

 teenth Annual Report of this Survey. 1 



At Vermilionville, in the valley of Vermilion River, a few miles below 

 Streator, a boring made for oil reached a depth of 1,000 feet and obtained 

 a strong flow of excellent water. Numerous springs occur along the Ver- 

 milion River below Streator, which are in part from the St. Peter and in 

 part from Coal Measures. The water is usually of excellent quality. 



An artesian well 2,189 feet in depth was made by Mr. Pedicord on the 

 uplands north of the Illinois River -near Marseilles, at an altitude about 700 

 feet above tide. When cased, an overflow from a depth of 1,850 feet was 

 obtained. The well penetrated 169 feet of glacial drift. 2 



The following table of deep wells along the Marseilles moraine begins 

 in the northeast part of the county and proceeds southward. The moraine 

 is situated immediately east of Fox River as far south as the mouth of that 

 stream. Upon crossing the Illinois it bears east of south, leaving the county 

 near the southeast corner. The width, including the slopes, is 5 or 6 miles. 



Wells along the Marseilles moraine in eastern Lasalle County. 



'Part II, pp. 798-799. 



- Geol. of Illinois, Vol. VII, p. 50. 



