Skip to main content
LakeQuality
B

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.

MetricValueGrade
Water Clarity (Secchi Depth)18 ftA
Phosphorus37.8 µg/LC
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)46Mesotrophic

Moderate nutrients, good water quality

Water Quality Trend: Declining

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

MetricTrendChange/YearYears
Water Clarity Declining-0.17 m/yr7
Phosphorus Declining+4.27 µg/L/yr4
See year-by-year chart →

Location

Loading map…

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.

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: 2023-09-11

Monitoring stations: 2