Hall Lake

On the LakeGrade rubric Hall Lake fails the cutoffs — a TSI of 69 and persistent algal pressure put it in the bottom tier. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

At a TSI of 69, Hall Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. A maximum depth of 27 ft puts Hall Lake in the middle of Minnesota's depth distribution. At 548 acres, Hall Lake fits the Minnesota median for monitored lakes, with 4.1 miles of shoreline. Hall Lake ranks 3 of 7 in Martin County — solidly in the upper half of the local distribution.

No invasive species are currently listed at Hall Lake — the lake remains off the Minnesota infested-waters roster. Hall Lake's fishery is anchored by muskellunge, with 19 documented species in total — a destination water for muskie anglers. A documented public access point at Hall Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Ice-out has been recorded 18 times at Hall Lake, with a median around Mar 21. Multiple sampling years from Minnesota PCA volunteers and partner agencies back the grade, so the letter should hold steady absent a major watershed shift.