Long Lake

Long Lake grades an F: every scored parameter (clarity and phosphorus) rates poorly, placing it among the most stressed lakes monitored in Minnesota. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

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. Long Lake reaches 33 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. Long Lake covers 285 acres alongside 3.9 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within Hennepin County's 95 graded lakes, Long Lake ranks 62 — below the local median, though not at the bottom.

Long Lake carries an invasive watermilfoil record — boat-launch decontamination and shoreline care matter more here than at uninfested lakes. The fishery includes walleye among the lake's 14 documented species — a notable draw for Minnesota anglers. Public access is available — the lake is on the Minnesota PCA public-access list. Ice-out has been recorded 21 times at Long Lake, with a median around Mar 31. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.