Sofie Lake

On the LakeGrade rubric, Sofie Lake pulls an A: clarity at 15.4 ft and 21 µg/L of phosphorus put it in the top bracket for Minnesota. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI near 44 places Sofie Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. 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. Sofie Lake ranks 3 of 33 in Carlton County, putting it in the upper tier of locally monitored lakes.

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