Gerhardt Lake

Gerhardt Lake pulls a D on the LakeGrade rubric — phosphorus loading and limited clarity hold it below the Minnesota average. The lake's weakest score is on Secchi depth — the water looks more turbid than its phosphorus number alone would predict.

At a TSI of 63, Gerhardt Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Gerhardt Lake sits at rank 24 of 36 in Dakota County, in the lower half of the local distribution.

No invasive species are currently listed at Gerhardt Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Gerhardt Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Gerhardt Lake — most use is by shoreline residents and their guests. The grade is supported by multiple sampling years from Minnesota PCA volunteers and partner agencies, giving the letter a reasonably stable foundation.