Arrowhead Lake

The LakeGrade rubric puts Arrowhead Lake at a C: clarity at 6.5 ft, 21 µg/L of phosphorus, and a TSI of 49 signal an intermediate trophic state. Secchi readings are the weakest of the three parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

A TSI near 49 places Arrowhead Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. A maximum depth of 30 ft puts Arrowhead Lake in the middle of Wisconsin's depth distribution. Arrowhead Lake covers 295 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within the 19 graded lakes of Adams County, Arrowhead Lake sits at rank 15, near the bottom of the county list.

Arrowhead Lake is on the Wisconsin infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. Walleye are documented at Arrowhead Lake, one of 4 fish species on record for the lake. Public access is available — the lake is on the Wisconsin DNR public-access list. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.