Little Bass Lake
Polk County, WisconsinMesotrophic
Little Bass Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. High phosphorus is the leading drag on the score — likely from upland agriculture, lawn runoff, or in-lake sediment release.
A TSI near 46 places Little Bass 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. Little Bass Lake sits at rank 53 of 77 in Polk County, in the lower half of the local distribution.
Little Bass Lake has no invasive species recorded in Wisconsin state databases as of 2023, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Little Bass Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2023-09-11. Grade methodology: LakeGrade methodology.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Crystal clear, you can see 18 ft down. Phosphorus level: 37.8 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 18 ft | A |
| Phosphorus | 37.8 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Water Quality Trend: ↓ Declining
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.17 m/yr | 7 |
| Phosphorus | ↓ Declining | +4.27 µg/L/yr | 4 |
Location
County Ranking
Ranked #53 of 77 lakes in Polk County
Cleaner Lakes Within 30 Miles
Little Bass Lake holds Grade B. 3 nearby lakes hold higher grades.
- ADeer LakePolk County · 2.8 mi · Higher grade (B → A)
- ALoveless LakePolk County · 0.8 mi · Higher grade (B → A)
- ABalsam LakePolk County · 3.7 mi · Higher grade (B → A)
Nearby Lakes in Polk County
More Wisconsin Lake Rankings
State Parks Near Little Bass 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: 2023-09-11
Monitoring stations: 2