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.
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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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.6 ft | D |
| Phosphorus | 58 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 32 acres |
| Public Access | No |
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.009 m/yr | 3 |
| Phosphorus | ↑ Improving | -5.14 µg/L/yr | 3 |
Location
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.
- BAnn LakeCarver County · mi · Higher grade (C → B)
- CRound LakeHennepin County · mi · Higher overall water quality score
Nearby Lakes in Hennepin County
More Minnesota Lake Rankings
State Parks Near Silver Lake
Other Grade C Lakes in Minnesota
Eutrophic Lakes in Minnesota
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
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