Illinois IL-1040 2021 State Tax Form

The Illinois River is a principal tributary of the Mississippi River at approximately 273 miles in length. Located in the U.S. state of Illinois, the river has a drainage basin of 28,756.6 square miles. The Illinois River begins with the confluence of the Des Plaines and Kankakee rivers in the Chicago metropolitan area, and it generally flows to the southwest ac…
The Illinois River is a principal tributary of the Mississippi River at approximately 273 miles in length. Located in the U.S. state of Illinois, the river has a drainage basin of 28,756.6 square miles. The Illinois River begins with the confluence of the Des Plaines and Kankakee rivers in the Chicago metropolitan area, and it generally flows to the southwest across Illinois, until it empties into the Mississippi near Grafton, Illinois. Its drainage basin extends into southeastern Wisconsin, northwestern Indiana, and a very small area of southwestern Michigan in addition to central Illinois. Along its banks are several river ports, including the largest, Peoria, Illinois. Historic and recreation areas on the river include Starved Rock, and the internationally important wetlands of the Emiquon Complex and Dixon Waterfowl Refuge.
  • Country: United States
  • State: Illinois
  • Source: Confluence of the Kankakee and Des Plaines Rivers
  • Mouth: Mississippi River
  • Length: 273 mi (439 km)
  • Basin size: 28,070 sq mi (72,700 km²)
  • Progression: Illinois → Mississippi → Gulf of Mexico

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Data from: en.wikipedia.org