WELLS OF CRAWFORD COUNTY, ILLINOIS. 755 



At St. Marie a well at Mr. Picquet's did not enter rock at a depth of 30 

 feet, but other wells in the village strike rock at only 16 feet. West from 

 St. Marie, along the divide between Embarras and Little Wabash rivers, 

 wells are about 20 feet in depth and do not enter rock. 



Wells along the Embarras River in the southeast part of the county 

 are 30 to 45 feet in depth without entering rock. After penetrating a few 

 feet of sand they are largely through blue till. 



CRAWFORD COUNTY. 

 GENERAL STATEMENT. 



Crawford County is situated on the eastern border of the State imme- 

 diately south of Clark County and east of Jasper. It has an area of 452 

 square miles, with Robinson as the county seat. The eastern border is fol- 

 lowed by the Wabash River, which receives the drainage of a narrow strip 

 along its west bluff. The western half of the county is tributary to the 

 Embarras River, but that stream touches only the extreme southwest corner 

 of the county. This county, like those on the north and west, is covered 

 with white clay which absorbs rainfall slowly, although not so impervious 

 to water as the white clay in the south-central part of the State. 



The drift is apparently of slight depth on the uplands, rock being 

 entered in wells at many points within 10 or 15 feet of the surface. There 

 may, however, be deeply filled preglacial valleys tributary to the Wabash 

 and Embarras, whose courses are concealed by the drift. Where wells do 

 not enter rock they usually obtain water at a depth of 20 feet or less, and 

 thus do not test the thickness of the drift in its deeper portions. Wells 

 which enter rock obtain water without penetrating to great depth, there 

 being few wells more than 100 feet in depth. 



INDIVIDUAL WELLS. 



In the northern part of the county wells are usually obtained in sand- 

 stone at a depth of 35 feet or less. The drift is often not more than 15 feet 

 in depth. 



In the vicinity of Trimble the rock is in places scarcely 10 feet below 

 the surface and wells are obtained at moderate depths in sandstone. 



At Robinson wells are 20 to 25 feet in depth and usually enter sand- 

 stone a few feet. The mayor, Mr. Aldridge Walters, estimates that good 

 wells will vield 40 or 50 barrels per clay. 



