Horseleg Lake

On the LakeGrade scale Horseleg Lake grades a B, with clarity at 3.7 ft and 17 µg/L of phosphorus placing it above the Minnesota median. Secchi readings are the weakest of the three parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

Mesotrophic conditions dominate at Horseleg Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. 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. Horseleg Lake ranks 6 of 19 in Isanti County — solidly in the upper half of the local distribution.

No invasive species are currently listed at Horseleg Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Horseleg Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Horseleg Lake — most use is by shoreline residents and their guests. Multiple sampling years from Minnesota PCA volunteers and partner agencies back the grade, so the letter should hold steady absent a major watershed shift.