<P> For the last 20 miles ( 32 km ) of its course , the Illinois is separated from the Mississippi River by only about five miles , by a peninsula of land that makes up Calhoun County . The Illinois joins the Mississippi near Grafton , approximately 25 miles ( 40 km ) northwest of downtown St. Louis and about 20 miles upstream from the confluence of the Missouri River and the Mississippi . </P>
<P> For the last 20 miles ( 32 km ) of its course , the Illinois is separated from the Mississippi River by only about five miles , by a peninsula of land that makes up Calhoun County . The Illinois joins the Mississippi near Grafton , approximately 25 miles ( 40 km ) northwest of downtown St. Louis and about 20 miles upstream from the confluence of the Missouri River and the Mississippi . </P>
where do the illinois and mississippi rivers meet
where do the illinois and mississippi rivers meet
near Grafton , approximately 25 miles ( 40 km ) northwest of downtown St. Louis and about 20 miles upstream from the confluence of the Missouri River and the Mississippi
near Grafton , approximately 25 miles ( 40 km ) northwest of downtown St. Louis and about 20 miles upstream from the confluence of the Missouri River and the Mississippi