How deep is the Illinois River at its deepest point?
How deep is the Illinois River at its deepest point? The Illinois River flows entirely within our state and is the second-longest river at 332 miles (behind the Mississippi). Morris, Ottawa, La Salle, Peru, Peoria, Pekin, Havana, and Beardstown are cities along the Illinois River. Illinois River is approximately 80 feet (24.4 m) at its deepest point.
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