E. A. Patterson Lake
Stark County, WisconsinEutrophic
E. A. Patterson Lake is a 2,158-acre productive, nutrient-rich eutrophic lake in Stark County, ND. Water quality is graded D based on 3 sampling years through 2023. Compared to the 2 other monitored lakes in Stark County, E. A. Patterson Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-07-25. Grade methodology: LakeGrade methodology.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 5.3 ft. Phosphorus level: 262.5 µg/L. Chlorophyll-a: 15.9 µg/L. Trophic State Index: 65.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.3 ft | D |
| Phosphorus | 262.5 µg/L | F |
| Chlorophyll-a (Algae) | 15.9 µg/L | C |
| Trophic State Index (TSI) | 65 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 2.2K acres |
Location
County Ranking
Ranked #3 of 3 lakes in Stark County
Cleaner Lakes Within 30 Miles
E. A. Patterson Lake holds Grade D. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Stark County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
E. A. Patterson Lake is a man-made reservoir impounded by the Dickinson Dam (completed 1950), built primarily for irrigation on the HEART RIVER; earth-type dam, 65 ft tall and 2,275 ft long.
- Surface area
- 2,158 ac
- Normal storage
- 8,612 ac-ft
- Max storage
- 26,462 ac-ft
- Drainage area
- 401.42 sq mi
- Hazard class
- High
- Owner
- BUREAU OF RECLAMATION
All listed purposes: Irrigation;Water Supply.
Source: USACE National Inventory of Dams, NID ID ND00148 · Operator website · Matched by proximity (0.29 km)
EPA Impairment Status
E. A. Patterson Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit ND-10130202-002-L_00 · Official waterbody report · Matched by proximity (2.7 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: 2023-07-25
Monitoring stations: 1