Florence Lake

The LakeGrade rubric puts Florence Lake at a C: clarity at 9.0 ft, phosphorus readings still being added, and a TSI of 45 signal an intermediate trophic state. 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 near 45 places Florence Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. A maximum depth of 26 ft puts Florence Lake in the middle of Minnesota's depth distribution. Florence Lake covers 135 acres alongside 2.2 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Florence Lake sits at rank 10 of 19 in Isanti County, in the lower half of the local distribution.

Florence Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. The fishery includes walleye alongside the lake's other 15 documented species — a notable draw for Minnesota anglers. Public access is available — the lake is on the Minnesota PCA public-access list. The lake has a long ice-out record — 25 observations on file, with a median ice-out around Apr 3. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.