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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.4 ft | C |
| Phosphorus | 15.2 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.384 m/yr | 7 |
| Phosphorus | ↓ Declining | +3.6 µg/L/yr | 6 |
Location
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.
- AHalf Moon LakePolk County · 1.7 mi · Higher grade (B → A)
- ABalsam LakePolk County · 1 mi · Higher grade (B → A)
- ALost LakePolk County · 2.7 mi · Higher grade (B → A)
- ALoveless LakePolk County · 4 mi · Higher grade (B → A)
Nearby Lakes in Polk County
More Wisconsin Lake Rankings
State Parks Near Balsam Lake
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
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