Long Lake

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

A TSI near 49 places Long Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. A maximum depth of 34 ft puts Long Lake in the middle of Minnesota's depth distribution. At 346 acres, Long Lake fits the Minnesota median for monitored lakes, with 9.2 miles of shoreline. Long Lake sits at rank 103 of 141 in Itasca County, in the lower half of the local distribution.

Long Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. Walleye are documented at Long Lake, one of 14 fish species on record for the 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.