Silver Island Lake

Silver Island Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. The lake's weakest score is on Secchi depth — the water looks more turbid than its phosphorus number alone would predict.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. Silver Island Lake reaches 16 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. At 1,239 acres, Silver Island Lake is one of the larger lakes in Lake County, with 16.9 miles of shoreline supporting multiple distinct use patterns. Silver Island Lake ranks 130 of 159 in Lake County — at the lower end of the locally monitored distribution.

No invasive species are currently listed at Silver Island Lake — the lake remains off the Minnesota infested-waters roster. Walleye are documented at Silver Island Lake, one of 11 fish species on record for the lake. Public access is available — the lake is on the Minnesota PCA public-access list. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.