Silver Lake
McHenry County, WisconsinLimited DataMesotrophic
Silver Lake is a mesotrophic lake in McHenry County, IL. Water quality is graded B based on 1 sampling years through 2020. Compared to the 4 other monitored lakes in McHenry County, Silver Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2020-07-18. Grade methodology: LakeGrade methodology.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 10 ft. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Location
County Ranking
Ranked #2 of 5 lakes in McHenry County
Nearby Lakes in McHenry County
More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Silver Lake is a man-made reservoir impounded by the Silver Lake Dam (completed 1929), built primarily for recreation on the TRIB FOX RIVER; earth-type dam, 23 ft tall and 170 ft long.
- Normal storage
- 364 ac-ft
- Max storage
- 580 ac-ft
- Hazard class
- Low
- Owner
- VILLAGE OF OAKWOOD HILLS
Source: USACE National Inventory of Dams, NID ID IL00584 · 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 5).
Causes of impairment
Source: EPA ATTAINS assessment unit IL_RTW · Official waterbody report · Matched by proximity (0.1 km)
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
Most recent sample: 2020-07-18
Monitoring stations: 1