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LakeQuality
B

Inlet To Dunes Lake

Door County, WisconsinLimited DataEutrophic

On the LakeGrade scale Inlet To Dunes Lake grades a B, with clarity readings still being added and 29 µg/L of phosphorus placing it above the Wisconsin median. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. A maximum depth of just 1 ft means sediment-bound phosphorus releases back into the water column whenever wind stirs the bottom — a classic shallow-lake dynamic. The lake is compact at 48 acres, with partial shoreline records and little volume to buffer nutrient inputs. Inlet To Dunes Lake ranks 9 of 11 in Door County — at the lower end of the locally monitored distribution.

No invasive species are currently listed at Inlet To Dunes Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Inlet To 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.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2021-05-18. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

No clarity data. Phosphorus level: 28.9 µg/L. Trophic State Index: 53.

MetricValueGrade
Water Clarity (Secchi Depth)No data
Phosphorus28.9 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)53Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth1 ft
Surface Area48 acres

Water Quality Trend: Improving

Based on 2 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.5 m/yr2
Phosphorus Improving-21.9 µg/L/yr2

Location

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County Ranking

Ranked #9 of 11 lakes in Door County

Nearby Lakes in Door County

Eutrophic Lakes in Wisconsin

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 2 stations on file (most recent sample 2022).

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Fish and recreation data from Wisconsin DNR Lakes

Most recent sample: 2021-05-18

Monitoring stations: 1