South Grave Lake

South Grave Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. 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. South Grave Lake ranks 117 of 141 in Itasca County — at the lower end of the locally monitored distribution.

No invasive species are currently listed at South Grave Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for South Grave Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. Public access is available — the lake is on the Minnesota PCA public-access list. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.