Powderhorn Lake (Illinois)

Powderhorn Lake, within Illinois but close to the state line, is a 48 acres (19 ha) lake that is part of the sand wetlands of the Indiana Dunes, most of which are located in the nearby state of Indiana. It is the centerpiece of the 192 acres (78 ha) Powderhorn Lake Forest Preserve, part of the Forest Preserve District of Cook County in Cook County, Illinois.

Powderhorn Lake drains into the Grand Calumet River, which is historically part of the Lake Michigan watershed. Man-made engineering now moves the Grand Calumet River’s water into the Cal-Sag canal and valley system, which drains into the Des Plaines River and ultimately into the Illinois River.