Hidden Lake is a productive, nutrient-rich eutrophic lake in Keweenaw County, Michigan. 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, Michigan DNR, last sampled 2024-08-19. Grade methodology: LakeGrade methodology.
Watch Hidden Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
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
Where to stay near Hidden Lake
Compare lakeside cabins, hotels, and vacation rentals near Hidden Lake in Keweenaw County, Michigan — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Hidden Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Hidden Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Hidden Lake — straight to your inbox. No spam, unsubscribe anytime.
Planning a whole trip? See where to stay at Michigan’s top lakes →
Fishing Hidden Lake
Water Temperature
Hidden Lake averages about 68°F at the surface in summer, usually warmest in Aug (about 70°F) and coldest in May (about 54°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 22 field readings (2011–2024) via the EPA Water Quality Portal. See the full Hidden Lake water temperature breakdown →
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.
- 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)
- BLake GeorgeKeweenaw County · 14.3 mi · Higher grade (C → B)
Nearby Lakes in Keweenaw County
Explore Hidden Lake across LakeGrade
Fish species and top-graded lakes across Michigan
Fish species and best lakes in Keweenaw County
Species activity outlook by water temperature and season
Top lakes and where to stay in the Upper Peninsula area
Where to stay at Michigan's top lakes, each with its grade
High nutrients, frequent algae, reduced clarity
Michigan's cleanest and most-polluted lakes, ranked
More Michigan Lake Rankings
Other Grade C Lakes in Michigan
Marquette County · Clarity: 9 ft
Iron County · Clarity: 6 ft
Iron County · Clarity: 7.5 ft
Iron County · Clarity: 7.3 ft
Ontonagon County · Clarity: 6.5 ft
Gogebic County · Clarity: 8.3 ft
Eutrophic Lakes in Michigan
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-08-19
Monitoring stations: 1