Greigs Lake

On the LakeGrade scale Greigs Lake grades a B, with clarity at 12.6 ft and phosphorus readings still being added placing it above the Minnesota median. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI near 41 places Greigs Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake's 68 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. Greigs Lake is small — 55 acres alongside 1.2 miles of shoreline — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Among the 19 graded lakes in Pine County, Greigs Lake sits at rank 8, above the county median.

No invasive species are currently listed at Greigs Lake — the lake remains off the Minnesota infested-waters roster. Bass fishing is part of the appeal: the species list runs to 9, anchored by largemouth and/or smallmouth bass. No formal public access is documented at Greigs Lake — most use is by shoreline residents and their guests. 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.