Dunes Lake

Dunes Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. 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.

Mesotrophic conditions dominate at Dunes Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. At 48 acres, Dunes Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Within Door County's 11 graded lakes, Dunes Lake ranks 7 — below the local median, though not at the bottom.

No invasive species are currently listed at Dunes Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Dunes Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.