Bass Lake

On the LakeGrade scale Bass Lake grades a B, with clarity at 13.5 ft and phosphorus readings still being added placing it above the Minnesota median.

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. At 76 ft of maximum depth, Bass Lake stratifies reliably through the summer — the hypolimnion stays cooler and clearer than the surface layer suggests. With 2,715 acres of surface and 24.4 miles of shoreline, Bass Lake is a large water by Minnesota standards — recreational pressure is spread across a long shoreline. Among the 141 graded lakes in Itasca County, Bass Lake sits at rank 61, above the county median.

Zebra mussels have been documented at Bass Lake, which alters the filter-feeding balance and can paradoxically increase water clarity while disrupting the food web. Walleye are documented at Bass Lake, one of 19 fish species on record for the lake. Public access is available — the lake is on the Minnesota PCA public-access list. The lake has a partial ice record — 20 observed ice-outs, centered near Apr 23. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.