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C

Silver Lake

Hennepin County, MinnesotaEutrophic

Silver Lake sits at a C on the grading scale — not impaired, not pristine, with summer measurements that vary year to year. clarity and phosphorus rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake is compact at 32 acres, with partial shoreline records and little volume to buffer nutrient inputs. Among the 95 graded lakes in Hennepin County, Silver Lake ranks 23 — in the top quartile locally.

Silver Lake has no invasive species recorded in Minnesota state databases as of 2023, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Silver Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. 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, Minnesota DNR LakeFinder, last sampled 2023-09-14. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 5.6 ft. Phosphorus level: 58 µg/L. Trophic State Index: 58.

MetricValueGrade
Water Clarity (Secchi Depth)5.6 ftD
Phosphorus58 µg/LC
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)58Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Surface Area32 acres
Public AccessNo

Water Quality Trend: Improving

Based on 3 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Stable+0.009 m/yr3
Phosphorus Improving-5.14 µg/L/yr3

Location

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County Ranking

Ranked #23 of 95 lakes in Hennepin County

Cleaner Lakes Within 30 Miles

Silver Lake holds Grade C. 2 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Hennepin County

Reservoir Info (USACE NID)

Silver Lake is a man-made reservoir impounded by the Silver Lake (completed 1987), built primarily for recreation on the Purgatory Creek-TR; earth-type dam, 11 ft tall.

Surface area
32 ac
Max storage
50 ac-ft
Drainage area
0.5 sq mi
Hazard class
Low
Owner
City of Shorewood

Source: USACE National Inventory of Dams, NID ID MN01488 · Operator website

EPA Impairment Status

Silver Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Nutrients (phosphorus, nitrogen)

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MN27-0136-00 · Official waterbody report

Data Sources

Water quality data from the EPA Water Quality Portal

Impairment status from EPA ATTAINS 303(d) database

Grading methodology based on Metropolitan Council standards

Lake details from Minnesota DNR LakeFinder

Most recent sample: 2023-09-14

Monitoring stations: 1