Arrowhead Lake

Arrowhead Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Adams County. 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 40 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. Arrowhead Lake sits at rank 15 of 20 in Adams County, in the lower half of the local distribution.

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.