Lake Kohlmier Aeration
Each winter, Parks & Recreation Department staff apply for a permit with the Department of Natural Resources (DNR) to operate an aeration system on Lake Kohlmier. The DNR has several requirements including proof of public notice when it starts, verification of liability insurance, posting thin ice signs four to six feet high, at least 100 feet apart around the open area and completing a written inspection once every seven days.
The aeration system creating open water and thin ice is operating on Lake Kohlmier. Please stay clear of the marked areas.
Aeration increases oxygen levels in the lake to prevent winter fish kills. Oxygen is created through photosynthesis. Oxygen is used up by live plants, fish and bacteria that feed on decaying vegetation. When that level declines, fish can begin to suffocate. The aeration opens an area for sunlight to reach vegetation in the lake, replenishing the oxygen supply. Winterkill is a natural process that can be detrimental which is the reason the DNR issues permits for lakes that should use aeration.