Rock Creek is a 24.7 miles (39.8 km) tributary of the Kankakee River

Kankakee River

The Kankakee River is a tributary of the Illinois River, approximately long, in northwestern Indiana and northeastern Illinois in the United States. At one time the river drained one of the largest wetlands in North America and furnished a significant portage between the Great Lakes and the...

 in the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of Illinois

Illinois

Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...

. It empties into the Kankakee River in Kankakee River State Park

Kankakee River State Park

Kankakee River State Park is an Illinois state park on primarily in Kankakee and Will Counties, Illinois, United States. Originally, of land was donated by Ethel Sturges Dummer for the creation of the state park in 1938. Another was donated by Commonwealth Edison in 1956, and again donated more...

 which is just north west of the city of Kankakee. It starts in higher land and then drops into the Kankakee River Valley. Because of this, the river has cut through the rock, forming a gorge. The majority of this gorge is in the state park. There is also a trail in Kankakee River State Park that follows Rock Creek.Rock creek waterfalls area is a popular summer destination for the local residents who know of its location approx 1.5 miles upstream from the main entrance of the state park.The cliffs can reach as high as 80 feet high in this area from the park entrance to the falls.Its a very popular small mouth fishing destination for many northern and central area Illinois residents.