Gabbro Lake

Gabbro Lake earns a D — measurements through 2021 show persistent nutrient pressure that limits clarity through the summer.

At a TSI of 56, Gabbro Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. The lake's 50 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. The lake's 977 acres and 23.7 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Within the 142 graded lakes of Lake County, Gabbro Lake sits at rank 133, near the bottom of the county list.

Gabbro Lake has no invasive species recorded in Minnesota state databases as of 2021, though prevention practices still apply at all access points. Walleye are documented at Gabbro Lake, one of 8 fish species on record for the lake. No formal public access is documented at Gabbro 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.