Deer Lake

Deer Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Itasca County. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

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 121 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. Deer Lake covers 4,093 acres alongside 26.1 miles of shoreline, large enough that conditions can vary meaningfully between bays. Among the 141 graded lakes in Itasca County, Deer Lake sits at rank 42, above the county median.

No invasive species are currently listed at Deer Lake — the lake remains off the Minnesota infested-waters roster. Deer Lake's fishery is anchored by muskellunge, with 17 documented species in total — a destination water for muskie anglers. Public access is available — the lake is on the Minnesota PCA public-access list. Ice-out has been logged at Deer Lake more than two dozen times, putting the median around Apr 27 — a useful baseline for tracking climate trends. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.