Lake Hendricks
Howard County, WisconsinHypereutrophic
Lake Hendricks is a 50-acre highly nutrient-loaded hypereutrophic lake in Howard County, IA. Water quality is graded F based on 2 sampling years through 2024.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-10-21. Grade methodology: LakeGrade methodology.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 1.5 ft of visibility. Chlorophyll-a: 99.1 µg/L. Trophic State Index: 74.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.5 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 99.1 µg/L | F |
| Trophic State Index (TSI) | 74 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 50 acres |
Location
County Ranking
Ranked #1 of 1 lakes in Howard County
Cleaner Lakes Within 30 Miles
Lake Hendricks holds Grade F. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Howard County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
Hypereutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Lake Hendricks is a man-made reservoir impounded by the Lake Hendricks Dam (completed 1960), built primarily for recreation on the TR-WAPSIPINICON RIVER; earth-type dam, 30 ft tall and 2,375 ft long.
- Surface area
- 50 ac
- Normal storage
- 500 ac-ft
- Max storage
- 960 ac-ft
- Drainage area
- 1.88 sq mi
- Hazard class
- Significant
- Owner
- Howard County Conservation Board
Source: USACE National Inventory of Dams, NID ID IA00495 · Operator website
EPA Impairment Status
Lake Hendricks 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 IA 01-WPS-356 · 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: 2024-10-21
Monitoring stations: 1