Des Plaines 

 River 



•^•-) Detailed Map 



Ohio River 



Figure 1.1. Location of sediment sampling stations on the Illinois Waterway. 

 Stations are identified according to river miles: Illinois River miles (IR) 

 start at Grafton at mile 0.0 and proceed upstream to Chicago. A reference 

 station was established on the Mississippi River (MR), 377 miles above the 

 confluence with the Ohio River. ^ 



