Mole Lake

Mole Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Secchi readings are the weakest of the scored parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

Mesotrophic conditions dominate at Mole Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. A maximum depth of 17 ft puts Mole Lake in the middle of Wisconsin's depth distribution. Mole Lake is small — 77 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Mole Lake sits at rank 21 of 34 in Forest County, in the lower half of the local distribution.

Eurasian watermilfoil has been documented at Mole Lake, requiring shoreline management to keep dense mats from crowding native vegetation. Walleye are documented at Mole Lake, one of 4 fish species on record for the lake. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.