Beaver Dam Lake is a productive, nutrient-rich eutrophic lake in Kosciusko County, Indiana. Water quality is graded F based on 1 sampling years through 2021. Water clarity is improving over recent sampling years. The lake supports 4 documented fish species including Bluegill, Crappie, and Largemouth Bass. Public access is available with 1 public boat landing. Compared to the 18 other monitored lakes in Kosciusko County, Beaver Dam Lake ranks #17 for water quality.
Source: EPA Water Quality Portal sampling records, Indiana DNR, last sampled 2021-08-09. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 3.1 ft of visibility. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.1 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Beaver Dam Lake
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Beaver Dam Lake
Water Quality Trend: → Stable
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.378 m/yr | 3 |
| Chlorophyll-a | ↓ Declining | +7 µg/L/yr | 2 |
Recreation & Access
Location
County Ranking
Ranked #17 of 19 lakes in Kosciusko County
Nearby Lakes in Kosciusko County
Explore Beaver Dam Lake across LakeGrade
Fish species and top-graded lakes across Indiana
Fish species and best lakes in Kosciusko County
Species activity outlook by water temperature and season
Top lakes and where to stay in the Northern Indiana Lake Country area
High nutrients, frequent algae, reduced clarity
Indiana's cleanest and most-polluted lakes, ranked
More Indiana Lake Rankings
Other Grade F Lakes in Indiana
Eutrophic Lakes in Indiana
More records, surveys & data sources
EPA Impairment Status
Beaver Dam Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit INB06P1078_00 · Official waterbody report
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
4 EPA-permitted facilities operate within about 5 miles of Beaver Dam Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Tippecanoe Valley High SchoolMentone · 3.6 mi away · NPDES IN0037044Recent violation
- Cb Farms Livestock BuildingsClaypool · 3.4 mi away · NPDES INRA02841
- Tippecanoe Valley High SchoolAkron · 3.5 mi away · NPDES INRA04393
- Pike Lumber Company IncCarbon · 3.6 mi away · NPDES INRM00310
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2021-08-09
Monitoring stations: 1