Beaver Lake
Alger County, WisconsinOligotrophic
Beaver Lake is a cold, clear oligotrophic lake in Alger County, MI. Water quality is graded A based on 2 sampling years through 2024. The lake supports 14 documented fish species including Bluntnose minnow, Brook stickleback, and Brook trout. Compared to the 12 other monitored lakes in Alger County, Beaver Lake ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-08-21. Grade methodology: LakeGrade methodology.
Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 14.7 ft. Phosphorus level: 7.8 µg/L. Trophic State Index: 36.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.7 ft | B |
| Phosphorus | 7.8 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 36 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Fish Species
Click a species to see all Wisconsin and Minnesota lakes where it is found.
→ Best fishing times for Beaver Lake (14-day solunar calendar)
→ Is it safe to eat fish from Beaver Lake? (mercury & PFAS guide)
→ Beaver Lake fishing regulations (limits, seasons, special rules)
Location
County Ranking
Ranked #7 of 13 lakes in Alger County
Nearby Lakes in Alger County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
Mecosta County · Clarity: 12.8 ft
Benzie County · Clarity: 13.5 ft
Clare County · Clarity: 15 ft
Kalkaska County · Clarity: 16 ft
Gogebic County · Clarity: 18 ft
Iron County · Clarity: 16 ft
Oligotrophic Lakes in Wisconsin
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-08-21
Monitoring stations: 1