Gilfillan Lake

Gilfillan Lake earns a D — measurements through 2024 show persistent nutrient pressure that limits clarity through the summer. Clarity is the limiting factor — phosphorus is reasonable but suspended particles or algal cells keep water transparency below Minnesota norms.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. 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. Within Ramsey County's 49 graded lakes, Gilfillan Lake ranks 36 — below the local median, though not at the bottom.

No invasive species are currently listed at Gilfillan Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Gilfillan Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Gilfillan Lake — most use is by shoreline residents and their guests. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.