Illinois State Water Survey Films include a 16 mm film and VHS videos concerning the Embarras River tributary of the Wabash River; the Big Bureau Creek tributary of the Illinois River; the Des Plaines River; the Big Indian Creek tributary of the Fox River; the Kishwaukee River tributary of the Rock River; the Little Wabash River tributary of the Wabash River; the Mackinaw River tributary of the Illinois River; Rock River confluences with Kishwaukee River; the Spring Creek tributary of the Sangamon River; the Iroqouis River tributary of the Kankakee River; Spring Creek confluence with Iroquois River; Sugar Creek confluence with Iroquois River; the Vermillion River tributary of the Illinois River; and the first documented Hook Echo from the tornado event of April 9, 1953. With the exception of Hook Echo film, the content was created by the National Park Service.