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.

Illinois River, navigable stream of northern and central Illinois, U.S. It is formed by the junction of the Des Plaines and Kankakee rivers in Grundy county, about 10 miles (16 km) southwest of Joliet.

Illinois is bordered by 880 miles of rivers and has 87,110 miles of rivers and streams within its borders. The Mississippi River, Ohio River and Wabash River are the bordering rivers of the state. The Mississippi River forms the western border of Illinois in a 581 mile stretch of its course and as such is the longest river in the state.

May 15, 2023 · Illinois River. The Illinois River is the most significant river in the state of Illinois. Formed by the Des Plaines and Kankakee River junction, the Illinois River traverses west from Joliet toward Hennepin. Then, it changes course and flows southward until it joins the Mississippi River at Grafton.

The Illinois River is a principal tributary of the Mississippi River, approximately 273 miles (439 km) long, in the State of Illinois. The river drains a large section of central Illinois, with a drainage basin of 28,070 square miles. The drainage basin extends into Wisconsin and Indiana.

Illinois River Fishing Guide. The slow-moving Illinois River, which twists 273 miles through the heart of the state before joining the Mississippi River 14 miles upstream from Alton, has shown an improved fishery since the late 1970s, and anglers have made fine catches of sauger and walleyes, white bass, channel catfish, largemouth bass and ...

It is in the state of Illinois. It is an important tributary of the Mississippi River. The length of the river is about 439 km. The source of the river is in northeastern Illinois, near the city of Joliet. It flows west across Illinois, then southwest. It passes the city of Peoria, the largest city on the river. It flows into southwestern Illinois.

Illinois has approximately 86,076 miles of river, of which 17.1 miles of one river are designated as wild & scenic—approximately 2/100ths of 1% of the state's river miles. The Middle Fork of the Vermilion River is the only national wild and scenic river in Illinois.

The Illinois River, a tributary of the Mississippi River, is located in central and northern Illinois. It is 273 miles in length and has a drainage area of 28,906 square miles. The Illinois River Basin covers 44 percent of the state, and 90% of Illinois’ population resides in the counties overlapping wholly or partially with the watershed.

The Illinois River is a principal tributary of the Mississippi River, approximately 273 miles (439 km) long, in the State of Illinois.[3] The river drains a large section of central Illinois, with a drainage basin of 28,070 square miles (72,701 km2).[2]