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- Iroquois River
Class I
Iroquois River, IL/IN
Illinois Fishing River (Indiana State Line to Kankakee River)
The Iroquois River originates in Indiana and flows in a northwest direction for 55.4 miles through Illinois to its confluence with the Kankakee River near Aroma Park. The drainage area of the Iroquois River basin is 2137 square miles with 1240 square miles of that area being in Illinois. There are 11 named tributaries to the Iroquois River in Illinois, Spring Creek at 65 miles in length and Sugar Creek at 38.9 miles in length being the two largest. The mainstem Iroquois River is a relatively low gradient, slow moving river that is prone to diatom algae blooms in recent years. (Illinois DNR)