Reshanau Lake

Reshanau Lake earns a D — measurements through 2024 show persistent nutrient pressure that limits clarity through the summer. The lake's weakest score is on Secchi depth — the water looks more turbid than its phosphorus number alone would predict.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. A maximum depth of 16 ft puts Reshanau Lake in the middle of Minnesota's depth distribution. Reshanau Lake covers 337 acres alongside 4.2 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Reshanau Lake ranks 20 of 26 in Anoka County — at the lower end of the locally monitored distribution.

Reshanau Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Reshanau Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Reshanau 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.