Beaver Lake
Logan County, WisconsinEutrophic
Beaver Lake is a 953-acre productive, nutrient-rich eutrophic lake in Logan County, ND. Water quality is graded C based on 2 sampling years through 2024.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-10-01. Grade methodology: LakeGrade methodology.
Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Very murky, less than 1.4 ft of visibility. Chlorophyll-a: 4.8 µg/L. Trophic State Index: 59.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.4 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 4.8 µg/L | A |
| Trophic State Index (TSI) | 59 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 953.1 acres |
Location
County Ranking
Ranked #1 of 1 lakes in Logan County
Nearby Lakes in Logan County
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Beaver Lake is a man-made reservoir impounded by the Beaver Lake Dam (completed 1934), built primarily for recreation on the Beaver Creek; earth-type dam, 10 ft tall and 562 ft long.
- Surface area
- 953.1 ac
- Normal storage
- 5,319 ac-ft
- Max storage
- 5,319 ac-ft
- Drainage area
- 179 sq mi
- Hazard class
- Low
- Owner
- Logan County WRB
Source: USACE National Inventory of Dams, NID ID ND00368 · Operator website
EPA Impairment Status
Beaver 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-10130104-001-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: 2024-10-01
Monitoring stations: 1