North Stanchfield Lake

North Stanchfield Lake earns an F: 171 µg/L of phosphorus and clarity at 2.8 ft signal heavy nutrient loading from the surrounding watershed. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. At only 11 ft deep, North Stanchfield Lake is shallow — wind keeps the water column mixed and sediment resuspension drives phosphorus levels harder to manage. The lake's 157 acres and 3.5 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 19 graded lakes of Isanti County, North Stanchfield Lake sits at rank 18, near the bottom of the county list.

No invasive species are currently listed at North Stanchfield Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for North Stanchfield Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. Ice-out has been recorded 8 times at North Stanchfield Lake, with a median around Apr 1. Multiple sampling years from Minnesota PCA volunteers and partner agencies back the grade, so the letter should hold steady absent a major watershed shift.