WELLS OF MARSHALL COUNTY, ILLINOIS. 6fi9 



east bluff of the Illinois River or along- its tributaries. At Wenona, on the 

 eastern border of the county, the drift is about 100 feet in thickness and is 

 of similar depth at Toluca. These are the only points at which the distance 

 to rock in that part of the county has been ascertained. 



But few records of wells were obtained in this county, only a hasty 

 reconnaissance having been made. Nothing was learned to indicate that 

 wells are difficult to obtain. 



INDIVIDUAL WELLS. 



At Henry wells are usually obtained at a depth of 60 or 70 feet in the 

 sand of the Illinois River bottom. But a few reach a depth of 100 or 110 

 feet. An artesian well 1,300 feet in depth obtains a "white sulphur" water 

 in its lower part, probably either from the Lockport (Niagara) or Galena 

 limestone. The drift at this well is 135 feet in depth. The discharge of 

 the well is estimated at 32 gallons per minute from a pipe 3£ inches in 

 diameter 



At Lacon wells are usually obtained in the sand of the Illinois River 

 Valley at a depth of about 60 feet, though on a higher terrace in the east 

 part of the village a depth of about 100 feet is reached. It is reported that 

 some of the wells in the lower part of the city strike a limestone at about 

 60 feet, but no very authentic data could be obtained. The Manual of 

 American Waterworks reports that the public water supply is from a well, 

 depth not given. 



The public water supply at Wenona is obtained from a well 1,854 feet 

 in depth which is reported by residents to have entered the Potsdam near 

 the bottom, but perhaps terminated in St. Peter sandstone. It has a head 

 120 feet below the surface, or 565 feet above tide. The capacity is estimated 

 at 100 gallons per minute. Strong wells are obtained from the drift in the 

 vicinity of Wenona at depths of 40 to 60 feet. .The drift in that vicinity, as 

 already noted, is about 100 feet in depth. 



At Toluca the coal shafts encounter a large amount of water in the 

 lower part of the drift and also in the sandstones of the Coal Measures. 

 It is proposed to utilize the water from one of these horizons as the public 

 supply, but at last reports (in 1897) the waterworks had not been constructed. 



