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LakeQuality
F

Silent Street Pond

Dane County, WisconsinLimited DataHypereutrophic

On the LakeGrade rubric Silent Street Pond fails the cutoffs — a TSI of 94 and persistent algal pressure put it in the bottom tier. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Hypereutrophic conditions mean the lake is operating at the upper end of the productivity scale, with all the bloom risk that implies. 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. Within the 23 graded lakes of Dane County, Silent Street Pond sits at rank 18, near the bottom of the county list.

No invasive species are currently listed at Silent Street Pond — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Silent Street Pond, 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 2021-10-05. Grade methodology: LakeGrade methodology.

Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

No clarity data. Phosphorus level: 508 µg/L. Trophic State Index: 94.

MetricValueGrade
Water Clarity (Secchi Depth)No data
Phosphorus508 µg/LF
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)94Hypereutrophic

Very high nutrients, dense algae, poor clarity

Water Quality Trend: Improving

Based on 2 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Phosphorus Improving-132 µg/L/yr2

Location

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County Ranking

Ranked #18 of 23 lakes in Dane County

Nearby Lakes in Dane County

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2021-10-05

Monitoring stations: 1