Hidden Lake
Keweenaw County, WisconsinEutrophic
Hidden Lake is a productive, nutrient-rich eutrophic lake in Keweenaw County, MI. Water quality is graded C based on 2 sampling years through 2024. Compared to the 18 other monitored lakes in Keweenaw County, Hidden Lake ranks #19 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
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Very murky, less than 2.5 ft of visibility. Phosphorus level: 27.5 µg/L. Trophic State Index: 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 ft | F |
| Phosphorus | 27.5 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #19 of 19 lakes in Keweenaw County
Cleaner Lakes Within 30 Miles
Hidden Lake holds Grade C. 5 nearby lakes hold higher grades.
- ASu13 LakeKeweenaw County · 6.4 mi · Two grade letters higher (C → A)
- ASargent LakeKeweenaw County · 9.8 mi · Two grade letters higher (C → A)
- BLake AhmikKeweenaw County · 3.2 mi · Higher grade (C → B)
- BLake RichieKeweenaw County · 13.2 mi · Higher grade (C → B)
- BBeaver LakeKeweenaw County · 14.1 mi · Higher grade (C → B)
Nearby Lakes in Keweenaw County
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
Cass County · Clarity: 7 ft
Leelanau County · Clarity: 9.5 ft
Iosco County · Clarity: 5.5 ft
Muskegon County · Clarity: 6.8 ft
Gladwin County · Clarity: 9 ft
Montmorency County · Clarity: 9 ft
Eutrophic 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