Robinson Lake

Robinson Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Bayfield 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. Robinson Lake reaches 36 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. Robinson Lake is small — 89 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Robinson Lake ranks 11 of 55 in Bayfield County, putting it in the upper tier of locally monitored lakes.

An invasive species record — Banded Mystery Snail — has been logged at Robinson Lake; Wisconsin DNR maintains the official infested-waters list. The fishery includes walleye alongside the lake's other 4 documented species — a notable draw for Wisconsin anglers. 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.