Spring Lake

Spring Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Secchi readings are the weakest of the three parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

Mesotrophic conditions dominate at Spring Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. Spring Lake reaches 16 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. At 236 acres, Spring Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. Within Vilas County's 191 graded lakes, Spring Lake ranks 100 — below the local median, though not at the bottom.

Spring Lake has no invasive species recorded in Wisconsin state databases as of 2025, though prevention practices still apply at all access points. The fishery is bass-led, with 4 documented species across the lake's records. Public access is available — the lake is on the Wisconsin DNR public-access list. 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.