Morrison Lake

On the LakeGrade rubric, Morrison Lake pulls an A: clarity at 39.4 ft and 13 µg/L of phosphorus put it in the top bracket for Minnesota. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

A TSI value of 33 puts Morrison Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. 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 Clearwater County's 40 graded waters, Morrison Lake sits at rank 6, near the top of the local distribution.

No invasive species are currently listed at Morrison Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Morrison Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. 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.