Lake at Rock Cut State Park Permanently Closed to Swimming

Buildup of vegetation in lake is making water quality too poor for swimming

WINNEBAGO COUNTY - The Illinois Department of Natural Resources will prohibit swimming at Olson Beach at Rock Cut State Park.

Officials say that siltation of the lake in recent years, the shallow depth and warmer water temperatures have diminished the water quality of Olson Lake.   Olson Lake was designed to be a silt basin for Rock Cut State Park’s larger Pierce Lake, and while IDNR officials say Olson Lake it continues to function in that capacity, an increase in aquatic vegetation in Olson Lake has made it difficult to maintain the quality of water required for swimming and other beach activities.

The IDNR encourages suggest other beaches in the region for swimming, including the Lake Le-Aqua-Na State Recreation Area near Lena and the Rockford Park District’s Standfield Beach at Levings Lake Park.


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