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B

Dace Lake

Polk County, WisconsinLimited DataMesotrophic

Dace 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.

A TSI near 48 places Dace Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Dace Lake ranks 25 of 74 in Polk County — solidly in the upper half of the local distribution.

No invasive species are currently listed at Dace Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Dace 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 2023-09-12. Grade methodology: LakeGrade methodology.

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

No clarity data. Phosphorus level: 21.3 µg/L. Trophic State Index: 48.

MetricValueGrade
Water Clarity (Secchi Depth)No data
Phosphorus21.3 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)48Mesotrophic

Moderate nutrients, good water quality

Water Quality Trend: Improving

Based on 6 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Stable+0.07 m/yr6
Phosphorus Improving-2.8 µg/L/yr6
See year-by-year chart →

Location

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County Ranking

Ranked #25 of 74 lakes in Polk County

Cleaner Lakes Within 30 Miles

Dace Lake holds Grade B. One nearby lake has a higher grade.

Nearby Lakes in Polk County

EPA Impairment Status

Dace Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5R).

Causes of impairment

Cause unknown

Source: EPA ATTAINS assessment unit WI10005006 · Official waterbody report · Matched by proximity (1.58 km)

Data Sources

Water quality data from the EPA Water Quality Portal

Impairment status from EPA ATTAINS 303(d) database

Grading methodology based on Metropolitan Council standards

Most recent sample: 2023-09-12

Monitoring stations: 1

Where to stay near Dace Lake

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