Casey Creek (Illinois) and Atchison Creek. Gun Creek, which enters Rend Lake on the east side, might also be considered a Casey Creek tributary. Casey Creek (Illinois) Casey Creek is a major tributary of the Big Muddy River in Illinois, United States. It is about long, measured from the junction of its arm of Rend Lake with the arm formed by the Big Muddy River. Casey Creek is shown on federal maps as Casey Fork, following a 1967 decision by the U.S. Board on Geographic Names. It is named for Zadok Casey, a congressman from Illinois in the early 19th century. Casey Creek
Muddy, Illinois Muddy, Illinois Muddy is a small incorporated village located in the Harrisburg Township in Saline County, Illinois, United States. The population was 78 at the 2000 census. During the 19th century, the site of Muddy was home to a small settlement known as Robinson's Ford, which was among the communities considered for the seat of Saline County after the county's creation in the 1840s. The modern village of Muddy had its start as a mining settlement established by the Harrisburg Big Muddy Coal Company, for which it was named, in 1903. The mine was sold to the larger O'Gara Coal