Illinois River 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. South of Hennepin, the Illinois River is following the ancient channel of the Mississippi River. The Illinoian Stage, about 300,000 to 132,000 years ago, blocked the Mississippi near Rock Island, diverting it into its present channel. After the
Muddy River (Massachusetts) Muddy River (Massachusetts) The Muddy River is a series of brooks and ponds that runs through sections of Boston's Emerald Necklace, including along the south boundary of Brookline, Massachusetts (a town that went by the name of Muddy River Hamlet before it was incorporated in 1705). The river, which is narrower than most waterways designated as rivers in the United States, is a protected public recreation area surrounded by parks and hiking trails, managed by the Massachusetts Department of Conservation and Recreation. The river flows from Jamaica Pond through Olmsted Park's Wards Pond, Willow Pond, and Leverett Pond. It then