Tadd Lake

Tadd Lake grades an F: water clarity, phosphorus, and chlorophyll-a all rate poorly, placing it among the most stressed lakes monitored in Minnesota. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI above 70 puts Tadd Lake in hypereutrophic territory: visible blooms are common, and clarity rarely climbs even in early summer. At only 8 ft deep, Tadd Lake is shallow — wind keeps the water column mixed and sediment resuspension drives phosphorus levels harder to manage. The lake is compact at 39 acres, with 1.7 miles of shoreline and little volume to buffer nutrient inputs. Tadd Lake ranks 35 of 35 in Kandiyohi County — at the lower end of the locally monitored distribution.

No invasive species are currently listed at Tadd Lake — the lake remains off the Minnesota infested-waters roster. Walleye are documented at Tadd Lake, one of 10 fish species on record for the lake. The lake lacks a documented public access point, so visitor use is limited. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.