PROFILE OF A SECTION OF THE ILLINOIS RIVER 
Profile of the Illinois River from Chillicothe to Lagrange dam, showing 
elevations of water surface at low gage of 1901, channel depths, and general 
character of upper layer of bottom soils and sediments. The profile marks out 
clearly the three deep, flat-sloped, mud-bottomed, natural pools in which the 
richest accumulations of small bottom-animals were found both in 1913 and 
1915, viz.:. the Peoria Lake pool, lying behind the great bar thrown up by Farm 
Creek; the Havana pool, behind the great natural wier formed by the wash 
from Spoon River; and the Sangamon pool, lying behind the high bar thrown 
up by the mouths of the Sangamon. The data here used (elevations, soundings, 
and borings) are from the report of the U. S. Engineers’ Survey for a deep 
waterway, House Document No. 263, 59th Congress, Ist session, Washington, 
1905. ; 
