Castle Rock Dam Lake
Hettinger County, WisconsinEutrophic
Castle Rock Dam Lake is a 14-acre productive, nutrient-rich eutrophic lake in Hettinger County, ND. Water quality is graded D based on 2 sampling years through 2023. Compared to the 2 other monitored lakes in Hettinger County, Castle Rock Dam Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-10-10. 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 3.8 ft. Chlorophyll-a: 24.3 µg/L. Trophic State Index: 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.8 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 24.3 µg/L | D |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 14.2 acres |
Location
County Ranking
Ranked #3 of 3 lakes in Hettinger County
Cleaner Lakes Within 30 Miles
Castle Rock Dam Lake holds Grade D. 3 nearby lakes hold higher grades.
- BNorth Lemmon LakeAdams County · 25.3 mi · Two grade letters higher (D → B)
- CLarson LakeHettinger County · 8.3 mi · Higher grade (D → C)
- CIndian Creek Dam LakeHettinger County · 10.9 mi · Higher grade (D → C)
Nearby Lakes in Hettinger County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Castle Rock Dam Lake is a man-made reservoir impounded by the Castle Rock Dam (completed 1969), built primarily for recreation on the Cannonball River-TR; earth-type dam, 18 ft tall and 818 ft long.
- Surface area
- 14.2 ac
- Normal storage
- 75.1 ac-ft
- Max storage
- 184 ac-ft
- Drainage area
- 2.66 sq mi
- Hazard class
- Low
- Owner
- Louise & Larry Roemmich
Source: USACE National Inventory of Dams, NID ID ND00261 · Operator website
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-10-10
Monitoring stations: 1