Hunnewell Lake
Shelby County, WisconsinEutrophic
Hunnewell Lake is a 228-acre productive, nutrient-rich eutrophic lake in Shelby County, MO. Water quality is graded D based on 3 sampling years through 2024. Compared to the 1 other monitored lakes in Shelby County, Hunnewell Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-09-20. 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 3.2 ft of visibility. Phosphorus level: 36 µg/L. Chlorophyll-a: 15.4 µg/L. Trophic State Index: 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.2 ft | F |
| Phosphorus | 36 µg/L | C |
| Chlorophyll-a (Algae) | 15.4 µg/L | C |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 228 acres |
Location
County Ranking
Ranked #1 of 2 lakes in Shelby County
Cleaner Lakes Within 30 Miles
Hunnewell Lake holds Grade D. 3 nearby lakes hold higher grades.
- CMark Twain Lake Indian Creek ArmRalls County · 14.6 mi · Higher grade (D → C)
- CMark Twain LakeMonroe County · 14.8 mi · Higher grade (D → C)
- CMark Twain Lake by Hwy JRalls County · 17.1 mi · Higher grade (D → C)
Nearby Lakes in Shelby County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
St. Louis city County · Clarity: 2.3 ft
Macon County · Clarity: 1.8 ft
Harrison County · Clarity: 1.7 ft
Stone County · Clarity: 2.3 ft
Knox County · Clarity: 2.1 ft
Camden County · Clarity: 2.7 ft
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Hunnewell Lake is a man-made reservoir impounded by the Hunnewell Lake Dam (completed 1953), built primarily for recreation on the TR TO BROWNE BRANCH; earth-type dam, 45 ft tall and 1,200 ft long.
- Surface area
- 228 ac
- Normal storage
- 2,204 ac-ft
- Max storage
- 2,736 ac-ft
- Drainage area
- 3.98 sq mi
- Hazard class
- Significant
- Owner
- MO DEPT OF CONSERVATION
Source: USACE National Inventory of Dams, NID ID MO10106 · Operator website
EPA Impairment Status
Hunnewell Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MO_7029.00 · 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
Most recent sample: 2024-09-20
Monitoring stations: 2