Williamson Pond Max Depth
Lucas County, WisconsinHypereutrophic
Williamson Pond Max Depth is a 25-acre highly nutrient-loaded hypereutrophic lake in Lucas County, IA. Water quality is graded F based on 2 sampling years through 2024. Compared to the 3 other monitored lakes in Lucas County, Williamson Pond Max Depth ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-10-02. 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 1.6 ft of visibility. Chlorophyll-a: 73.9 µg/L. Trophic State Index: 72.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 73.9 µg/L | F |
| Trophic State Index (TSI) | 72 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 25 acres |
Location
County Ranking
Ranked #4 of 4 lakes in Lucas County
Cleaner Lakes Within 30 Miles
Williamson Pond Max Depth holds Grade F. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Lucas County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
Hypereutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Williamson Pond Max Depth is a man-made reservoir impounded by the Williamson Pond Dam (completed 1915), built primarily for recreation on the TR-ENGLISH CREEK; earth-type dam, 32 ft tall and 575 ft long.
- Surface area
- 25 ac
- Normal storage
- 223 ac-ft
- Max storage
- 484 ac-ft
- Drainage area
- 2.28 sq mi
- Hazard class
- Low
- Owner
- Iowa Department of Natural Resources
Source: USACE National Inventory of Dams, NID ID IA01296 · Operator website · Matched by proximity (0.06 km)
EPA Impairment Status
Williamson Pond Max Depth is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit IA 04-LDM-1058 · Official waterbody report · Matched by proximity (0.34 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: 2024-10-02
Monitoring stations: 1