Feldtmann Lake
Keweenaw County, WisconsinMesotrophic
Feldtmann Lake is a mesotrophic lake in Keweenaw County, MI. Water quality is graded B based on 2 sampling years through 2024. The lake supports 3 documented fish species including Northern pike, White sucker, and Yellow perch. Compared to the 18 other monitored lakes in Keweenaw County, Feldtmann Lake ranks #12 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-08-19. 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 7.3 ft. Phosphorus level: 14.2 µg/L. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.3 ft | C |
| Phosphorus | 14.2 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 45 | 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 Feldtmann Lake (14-day solunar calendar)
→ Is it safe to eat fish from Feldtmann Lake? (mercury & PFAS guide)
→ Feldtmann Lake fishing regulations (limits, seasons, special rules)
Location
County Ranking
Ranked #12 of 19 lakes in Keweenaw County
Cleaner Lakes Within 30 Miles
Feldtmann Lake holds Grade B. 2 nearby lakes hold higher grades.
- ASiskiwit LakeKeweenaw County · 20.5 mi · Higher grade (B → A)
- ALake HarveyKeweenaw County · 22.2 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: 2024-08-19
Monitoring stations: 1