Newton Lake

On the scoring rubric Newton Lake grades a D: clarity at 4.5 ft and phosphorus readings still being added keep it in the lower bracket for Lake County.

At a TSI of 55, Newton Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. Newton Lake reaches 47 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. Newton Lake covers 516 acres alongside 12.1 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within the 142 graded lakes of Lake County, Newton Lake sits at rank 132, near the bottom of the county list.

An invasive species record — spiny waterflea — has been logged at Newton Lake; Minnesota PCA maintains the official infested-waters list. The fishery includes walleye among the lake's 8 documented species — a notable draw for Minnesota anglers. The lake lacks a documented public access point, so visitor use is limited. 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.