Little Portage Lake

Little Portage Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Cass County. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

The lake's low TSI puts it in oligotrophic territory — the cleanest of the four trophic classes, but also the most vulnerable to nutrient-driven shifts. 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. Little Portage Lake ranks 19 of 133 in Cass County, putting it in the upper tier of locally monitored lakes.

No invasive species are currently listed at Little Portage Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Little Portage Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Little Portage Lake — most use is by shoreline residents and their guests. The lake has a partial ice record — 5 observed ice-outs, centered near Apr 12. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.