Henry Sever Lake
Knox County, WisconsinEutrophic
Henry Sever Lake is a 160-acre productive, nutrient-rich eutrophic lake in Knox County, MO. Water quality is graded D based on 3 sampling years through 2024.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-07-31. Grade methodology: LakeGrade methodology.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 2.1 ft of visibility. Phosphorus level: 58 µg/L. Chlorophyll-a: 25.4 µg/L. Trophic State Index: 64.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.1 ft | F |
| Phosphorus | 58 µg/L | C |
| Chlorophyll-a (Algae) | 25.4 µg/L | D |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 160 acres |
Location
County Ranking
Ranked #1 of 1 lakes in Knox County
Cleaner Lakes Within 30 Miles
Henry Sever Lake holds Grade D. 2 nearby lakes hold higher grades.
- DDeer Ridge Comm. LakeLewis County · 14.4 mi · Higher overall water quality score
- DHunnewell LakeShelby County · 21.5 mi · Higher overall water quality score
Nearby Lakes in Knox County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
St. Louis city County · Clarity: 2.3 ft
Shelby County · Clarity: 3.2 ft
Macon County · Clarity: 1.8 ft
Harrison County · Clarity: 1.7 ft
Stone County · Clarity: 2.3 ft
Camden County · Clarity: 2.7 ft
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Henry Sever Lake is a man-made reservoir impounded by the Henry Sever Dam (completed 1961), built primarily for recreation on the MEYERS BRANCH; earth-type dam, 41 ft tall and 1,160 ft long.
- Surface area
- 160 ac
- Normal storage
- 2,101 ac-ft
- Max storage
- 2,265 ac-ft
- Drainage area
- 3.1 sq mi
- Hazard class
- High
- Owner
- MO DEPT OF CONSERVATION
Source: USACE National Inventory of Dams, NID ID MO10110 · Operator website
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-07-31
Monitoring stations: 2