Hazel Hill Lake by Dam
Johnson County, WisconsinEutrophic
Hazel Hill Lake by Dam is a 71-acre productive, nutrient-rich eutrophic lake in Johnson County, MO. Water quality is graded D based on 3 sampling years through 2024. Compared to the 4 other monitored lakes in Johnson County, Hazel Hill Lake by Dam ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-08-06. 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 ft of visibility. Phosphorus level: 59.3 µg/L. Chlorophyll-a: 28 µg/L. Trophic State Index: 64.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2 ft | F |
| Phosphorus | 59.3 µg/L | C |
| Chlorophyll-a (Algae) | 28 µg/L | D |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 71 acres |
Location
County Ranking
Ranked #4 of 5 lakes in Johnson County
Cleaner Lakes Within 30 Miles
Hazel Hill Lake by Dam holds Grade D. 3 nearby lakes hold higher grades.
- BRock Lake Village LakeJohnson County · 16.2 mi · Two grade letters higher (D → B)
- BLake ButeoJohnson County · 12.5 mi · Two grade letters higher (D → B)
- CKnob Noster S.P. Lake 2Johnson County · 11.7 mi · Higher grade (D → C)
Nearby Lakes in Johnson 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
Knox County · Clarity: 2.1 ft
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Hazel Hill Lake by Dam is a man-made reservoir impounded by the Hazel Hill Community Dam (completed 1989), built primarily for recreation on the TR-WALNUT CREEK; earth-type dam, 38 ft tall and 1,112 ft long.
- Surface area
- 71 ac
- Normal storage
- 544 ac-ft
- Max storage
- 544 ac-ft
- Drainage area
- 2.34 sq mi
- Hazard class
- Significant
- Owner
- MO DEPT OF CONSERVATION
Source: USACE National Inventory of Dams, NID ID MO20785 · Operator website · Matched by proximity (0.05 km)
EPA Impairment Status
Hazel Hill Lake by Dam 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_7387.00 · Official waterbody report · Matched by proximity (0.48 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: 2024-08-06
Monitoring stations: 2