4 
toward the southeast and flows over a bed of predom- proximately 180-mile course through eastern Illinois 
inantly sand and Illinoian clays. The river empties into Chemical measurements taken in the Embarra 
the Wabash River near Billett, Lawrence County, River at Camargo in Douglas County from October 
having drained about 2,400 square miles in its ap- 1966, to April, 1968, by the Illinois State Water Survey 
Fig. 2. — Two stations in the study area: Embarras River 1 mile west (top) and 3 miles southwest (bottom) of 
Greenup, Cumberland County, Illinois. 
