Strup Lake

Strup Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. The lake's 195 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. Strup Lake covers 1,689 acres alongside 22.9 miles of shoreline, large enough that conditions can vary meaningfully between bays. Strup Lake sits at rank 104 of 142 in Lake County, in the lower half of the local distribution.

No invasive species are currently listed at Strup Lake — the lake remains off the Minnesota infested-waters roster. Bass fishing is part of the appeal: the species list runs to 5, anchored by largemouth and/or smallmouth bass. The lake lacks a documented public access point, so visitor use is limited. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.