Larson Lake
Hettinger County, WisconsinEutrophic
Larson Lake is a 235-acre productive, nutrient-rich eutrophic lake in Hettinger County, ND. Water quality is graded C based on 2 sampling years through 2023. Compared to the 2 other monitored lakes in Hettinger County, Larson Lake ranks #1 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
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 4.8 ft. Chlorophyll-a: 13.1 µg/L. Trophic State Index: 55.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.8 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 13.1 µg/L | C |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 235 acres |
Location
County Ranking
Ranked #1 of 3 lakes in Hettinger County
Nearby Lakes in Hettinger County
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Larson Lake is a man-made reservoir impounded by the Regent Dam - Spring Creek Dam (completed 1934), built primarily for recreation on the Cannonball River - TR; earth-type dam, 21 ft tall and 395 ft long.
- Surface area
- 235 ac
- Normal storage
- 1,210 ac-ft
- Max storage
- 3,470 ac-ft
- Drainage area
- 31.5 sq mi
- Hazard class
- Low
- Owner
- Hettinger County WRB
Source: USACE National Inventory of Dams, NID ID ND00118 · Operator website
EPA Impairment Status
Larson 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-10130204-002-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: 2023-10-10
Monitoring stations: 1