Nygren Dam Lake
Morton County, WisconsinEutrophic
Nygren Dam Lake is a 33-acre productive, nutrient-rich eutrophic lake in Morton County, ND. Water quality is graded D based on 2 sampling years through 2023. Compared to the 3 other monitored lakes in Morton County, Nygren Dam Lake ranks #1 for water quality.
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
Very murky, less than 2.6 ft of visibility. Chlorophyll-a: 24.7 µg/L. Trophic State Index: 63.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.6 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 24.7 µg/L | D |
| Trophic State Index (TSI) | 63 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 33.1 acres |
Location
County Ranking
Ranked #1 of 4 lakes in Morton County
Cleaner Lakes Within 30 Miles
Nygren Dam Lake holds Grade D. 2 nearby lakes hold higher grades.
- CLake TschidaGrant County · 28.5 mi · Higher grade (D → C)
- CLake TschidaGrant County · 29.4 mi · Higher grade (D → C)
Nearby Lakes in Morton County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Nygren Dam Lake is a man-made reservoir impounded by the Nygren Dam (completed 1967), built primarily for recreation on the Heart River-TR; earth-type dam, 37 ft tall and 250 ft long.
- Surface area
- 33.1 ac
- Normal storage
- 92.3 ac-ft
- Max storage
- 193 ac-ft
- Drainage area
- 4 sq mi
- Hazard class
- Low
- Owner
- Morton County WRB & Hwy D
Source: USACE National Inventory of Dams, NID ID ND00200 · 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