Froelich Dam Lake
Sioux County, WisconsinEutrophic
Froelich Dam Lake is a 175-acre productive, nutrient-rich eutrophic lake in Sioux County, ND. Water quality is graded D based on 2 sampling years through 2023.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-10-20. 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 3.9 ft. Chlorophyll-a: 37.5 µg/L. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.9 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 37.5 µg/L | F |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 175 acres |
Location
County Ranking
Ranked #1 of 1 lakes in Sioux County
Cleaner Lakes Within 30 Miles
Froelich Dam Lake holds Grade D. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Sioux County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Froelich Dam Lake is a man-made reservoir impounded by the Froelich Dam (completed 1962), built primarily for recreation on the Porcupine Creek-TR; earth-type dam, 46 ft tall and 821 ft long.
- Surface area
- 175 ac
- Normal storage
- 2,271.3 ac-ft
- Max storage
- 4,212.9 ac-ft
- Drainage area
- 68.3 sq mi
- Hazard class
- Low
- Owner
- ND Game & Fish
All listed purposes: Recreation;Fire Protection, Stock, Or Small Fish Pond.
Source: USACE National Inventory of Dams, NID ID ND00025 · Operator website
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-10-20
Monitoring stations: 1