Kolding Dam Lake
Grand Forks County, WisconsinLimited DataEutrophic
Kolding Dam Lake is a 10-acre productive, nutrient-rich eutrophic lake in Grand Forks County, ND. Water quality is graded F based on 1 sampling years through 2025. Compared to the 3 other monitored lakes in Grand Forks County, Kolding Dam Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2025-10-13. 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 1.7 ft of visibility. Trophic State Index: 70.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.7 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 70 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 9.8 acres |
Location
County Ranking
Ranked #3 of 4 lakes in Grand Forks County
Cleaner Lakes Within 30 Miles
Kolding Dam Lake holds Grade F. 3 nearby lakes hold higher grades.
- CFordville Dam LakeGrand Forks County · 14.9 mi · Two grade letters higher (F → C)
- DLarimore Dam LakeGrand Forks County · 8.4 mi · Higher grade (F → D)
- DLake LarettaNelson County · 19.4 mi · Higher grade (F → D)
Nearby Lakes in Grand Forks County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Kolding Dam Lake is a man-made reservoir impounded by the Kolding Dam (completed 1972), built primarily for flood risk reduction on the Whisky Ceek-TR; earth-type dam, 71 ft tall and 3,455 ft long.
- Surface area
- 9.8 ac
- Normal storage
- 73.5 ac-ft
- Max storage
- 1,983 ac-ft
- Drainage area
- 11.2 sq mi
- Hazard class
- Significant
- Owner
- Grand Forks County WRB
Source: USACE National Inventory of Dams, NID ID ND00306 · Operator website
EPA Impairment Status
Kolding Dam Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit ND-09020307-004-L_00 · 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: 2025-10-13
Monitoring stations: 1