Hooper Pond Lake
Warren County, WisconsinEutrophic
Hooper Pond Lake is a 45-acre productive, nutrient-rich eutrophic lake in Warren County, IA. Water quality is graded D based on 2 sampling years through 2024. Compared to the 1 other monitored lakes in Warren County, Hooper Pond Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-09-18. 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 2.5 ft of visibility. Chlorophyll-a: 25.1 µg/L. Trophic State Index: 63.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 25.1 µg/L | D |
| Trophic State Index (TSI) | 63 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 44.8 acres |
Location
County Ranking
Ranked #1 of 2 lakes in Warren County
Cleaner Lakes Within 30 Miles
Hooper Pond Lake holds Grade D. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Warren County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Hooper Pond Lake is a man-made reservoir impounded by the Hooper Dam (completed 1996), built primarily for recreation on the TR- SQUAW CREEK; earth-type dam, 37 ft tall and 900 ft long.
- Surface area
- 44.8 ac
- Normal storage
- 418 ac-ft
- Max storage
- 879 ac-ft
- Drainage area
- 2.23 sq mi
- Hazard class
- Significant
- Owner
- Iowa Department of Natural Resources
Source: USACE National Inventory of Dams, NID ID IA03101 · Operator website
EPA Impairment Status
Hooper Pond Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit IA 04-LDM-1080 · Official waterbody report · Matched by proximity (1.12 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: 2024-09-18
Monitoring stations: 1