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LakeQuality
B

Balsam Lake

Polk County, WisconsinMesotrophic

Balsam Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Secchi readings are the weakest of the three parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

A TSI near 46 places Balsam 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. Balsam Lake sits at rank 45 of 77 in Polk County, in the lower half of the local distribution.

No invasive species are currently listed at Balsam Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Balsam 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 2025-09-08. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Moderate clarity, visible to about 7.4 ft. Phosphorus level: 15.2 µg/L. Trophic State Index: 46.

MetricValueGrade
Water Clarity (Secchi Depth)7.4 ftC
Phosphorus15.2 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)46Mesotrophic

Moderate nutrients, good water quality

Water Quality Trend: Stable

Based on 7 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.384 m/yr7
Phosphorus Declining+3.6 µg/L/yr6
See year-by-year chart →

Location

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County Ranking

Ranked #45 of 77 lakes in Polk County

Cleaner Lakes Within 30 Miles

Balsam Lake holds Grade B. 4 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Polk County

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-09-08

Monitoring stations: 2