South Sugar Lake

South Sugar 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.

Mesotrophic conditions dominate at South Sugar Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. The lake bottoms out at 36 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. South Sugar Lake is small — 83 acres alongside 2.3 miles of shoreline — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Within Itasca County's 141 graded waters, South Sugar Lake sits at rank 27, near the top of the local distribution.

No invasive species are currently listed at South Sugar Lake — the lake remains off the Minnesota infested-waters roster. The fishery includes walleye alongside the lake's other 8 documented species — a notable draw for Minnesota anglers. No formal public access is documented at South Sugar Lake — most use is by shoreline residents and their guests. The lake has a partial ice record — 15 observed ice-outs, centered near Apr 17. 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.