Beaver Lake
Keweenaw County, WisconsinMesotrophic
Beaver Lake is a mesotrophic lake in Keweenaw County, MI. Water quality is graded B based on 2 sampling years through 2024. The lake supports 16 documented fish species including Bluntnose minnow, Brook stickleback, and Brook trout. Compared to the 18 other monitored lakes in Keweenaw County, Beaver Lake ranks #11 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-08-20. Grade methodology: LakeGrade methodology.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 8 ft. Phosphorus level: 17.1 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8 ft | C |
| Phosphorus | 17.1 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
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 #11 of 19 lakes in Keweenaw County
Cleaner Lakes Within 30 Miles
Beaver Lake holds Grade B. 3 nearby lakes hold higher grades.
- ALake HarveyKeweenaw County · 2.7 mi · Higher grade (B → A)
- ASargent LakeKeweenaw County · 4.5 mi · Higher grade (B → A)
- ASiskiwit LakeKeweenaw County · 5.5 mi · Higher grade (B → A)
Nearby Lakes in Keweenaw County
More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Lapeer County · Clarity: 9.5 ft
Livingston County · Clarity: 13 ft
Manistee County · Clarity: 11 ft
Lake County · Clarity: 14 ft
Cass County · Clarity: 10.5 ft
Genesee County · Clarity: 10 ft
Mesotrophic Lakes in Wisconsin
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-08-20
Monitoring stations: 1