Kaskaskia River - Hydrography

Hydrography

The Kaskaskia rises in east central Illinois in several farm ditches along the west side of Champaign. The headwaters of the river is just north of Interstate 74, where it is marked with a sign. The river flows south across rural Champaign and Douglas counties, then southwest across southern Illinois, past Vandalia. It joins the Mississippi from the north approximately 10 miles (16 km) northwest of Chester and 40 miles (64 km) south-southeast of St. Louis, Missouri. The watershed of the river encompasses approximately 5,746 square miles (14,880 km2), approximately 10.2% of the state of Illinois.

The Kaskaskia is impounded in Shelby County to form Lake Shelbyville. It is also impounded in Clinton County southwest of Vandalia to form Carlyle Lake.

For most of the 19th century, the river joined the Mississippi at Chester. Deforestation of river banks of the Mississippi and tributaries to fuel the hundreds of steamboats that plied the river had several significant environmental effects: destabilizing the banks, causing the Mississippi to become wider and more shallow, causing more severe flooding and leading to lateral channel changes in the American Bottoms area. In the aftermath of a major 1881 flood, the Mississippi changed its channel and moved east to flow along the lower 10 miles (16 km) of the channel of the Kaskaskia, shifting the confluence 10 miles north. As a result, a small portion of Illinois, including the former capital, Kaskaskia, was cut off from Illinois when the river moved to its east side. It is now located on the west side of the Mississippi. The community of Kaskaskia can now only be reached from the Missouri shore. The Kaskaskia River State Fish & Wildlife Area is located along the lower river in southern Illinois.

Fort Kaskaskia was located near the mouth of the river in Randolph County.