Big Moon Lake at

Big Moon Lake at earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Barron County. 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.

Mesotrophic conditions dominate at Big Moon Lake at: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. The lake bottoms out at 48 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. The lake's 187 acres and partial shoreline records put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Big Moon Lake at ranks 16 of 38 in Barron County — solidly in the upper half of the local distribution.

An invasive species record — Chinese Mystery Snail — has been logged at Big Moon Lake at; Wisconsin DNR maintains the official infested-waters list. Walleye are documented at Big Moon Lake at, one of 5 fish species on record for the lake. Public access is available — the lake is on the Wisconsin DNR public-access list. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.