Lake Thompson

Lake Thompson sits at a C on the grading scale — not impaired, not pristine, with summer measurements that vary year to year. Secchi readings are the weakest of the three parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. The lake bottoms out at 30 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. The lake's 401 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. Lake Thompson sits at rank 85 of 134 in Oneida County, in the lower half of the local distribution.

An invasive species record — Chinese Mystery Snail — has been logged at Lake Thompson; Wisconsin DNR maintains the official infested-waters list. Walleye are documented at Lake Thompson, one of 6 fish species on record for the lake. A documented public access point at Lake Thompson makes the lake usable for shore fishing, paddle craft, and trailered boats. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.