Download coordinates as: Thorn Creek is a 20.8-mile-long (33.5 km)[2] tributary of the Little Calumet River that travels through Will and Cook counties in northeastern Illinois just south of Chicago.

[1] It starts in the high land of the Valparaiso Moraine before dropping 200 feet (60 m) to the lower elevations of the Little Calumet River valley.

This dam creates an accumulation of several feet of silt in Sauk Lake and is being considered for Notching in 2016 by the Corps of Engineers.

The impact upon Ground Water Recharge, mitigation of Thorn Creek's 'flashiness' and future recreational activities are also concerns of Water-Shed Stakeholders.

This article related to a river in Illinois is a stub.