530 



THE GLACIAL LAKE AGASSIZ. 



Arlesian rvelh deriving water from the Dakota sandstone in North, and South Dakota. 



Devils Lake . . 

 Jamestown - - . 



Oakes 



Ellendale 



Britton 



Columbia 



Andover 



Groton 



Aberdeen 



Ipswich 



Mellette 



Ashton 



Doland 



Eedfield 



Faulkton 



Hitchcock 



Huron 



Miller 



Highmore 



Harold 



Woonsocket . . 



Letcher 



Mitchell 



Plankinton . .. 



Kimball 



Vermillion 



Meckling 



Yankton 



Tyndall 



Fort Eandall . 



Distance on latitude 

 and longitude from 

 the southeast corner 

 of South Dakota. 



106 



Fett. 

 1,511 

 1,476 

 944 

 1,087 

 1,004 



1,148 

 1,552 

 1,453 



600 



Pressure 

 at surface 

 per square 



Head above 

 surface, 

 computed 

 from pres- 

 sure. 



45 



104 



Altitudes above the e 



Source of 

 water in 

 upper part 

 of the Da- 

 kota sand- 

 stone. 



Surface, 



railroad at 



station. 



Feet. 

 1,464 

 1,408 

 1,322 

 1,449 

 1,354 

 1,304 

 1,476 

 1,304 

 1,300 

 1,530 

 1,300 

 1,296 

 1,355 

 1,295 

 1,573 

 1. 339 

 1.287 

 1,587 

 1,890 



1,300 

 1,301 

 1,528 

 1,788 

 1,150 

 1,156 



n,260 



Head, com- 

 puted from 

 pressure. 



1,619 

 1,737 



1,684 

 1,736 

 1,704 

 1,692 



1,743 

 1,691 

 1,875 

 1,948 

 1,986 

 1,061 



1,851 

 2,007 

 1,185 



1,364 



• The pressure reported at Ashton is 100 or 125 pounds less than would be expected in proportion with other localities, 

 and at Groton it is somewhat more. The discrepancy of the latter, however, is no greater than may be due to the superior 

 permeability of the waterbearing stratum. 



^Approximate altitude of high water of the Missouri River at Fort Kandall. 



For the greater part of my notes of the artesian wells of South 

 Dakota, also of Ellendale and Oakes, in North Dakota, I am indebted to 

 "Resources of Dakota," published by the Territorial commissioner of 

 immigration in 1887, and to recent correspondence with Prof G. E. Culver, 

 then of the University of South Dakota, and Avith Prof C. W. Hall, of 

 the University of Minnesota. These data, A\'ith those obtained by me at 

 Devils Lake and Jamestown, I have placed in tabular form for convenient 

 comparison, showing (1 and 2) the distances of the localities north and 



