Hidden Lake
Keweenaw County, MichiganView mapDirections
EGLE publishes the water-quality measurements for Hidden Lake. Here is what has been measured.
- Limited data
Hidden Lake in Keweenaw County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 2.5 ft visibility. Phosphorus: 27.5 µg/L.
Hidden Lake is a lake in Keweenaw County, Michigan.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2024-08-19. Methodology: how these readings are compared.
What Hidden Lake is good for
From access and monitoring records, not editorial picks.
- Camping3 public campgrounds nearby
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Hidden Lake is safe to swim in today is a call for the Michigan Department of Environment, Great Lakes, and Energy (EGLE) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Hidden Lake
These are the measurements EGLE publishes for Hidden Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 2.5 ft of visibility. Phosphorus 27.5 µg/L. TSI 58.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 27.5µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 58 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Hidden Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Hidden Lake typically sits around 70°F at the surface in August. Summer average is about 68°F. Usually warmest in Aug (about 70°F) and coldest in May (about 54°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (54°F) to its warmest (70°F).
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 →
Recreation & Access
Public campgrounds near Hidden Lake
- Duncan Narrows1.3 km
- Rock Harbor1.7 km
- Merrit Lane4.4 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Stays via Stay22
Stays 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
Prices for Oct 23–25, 4 adults. Change dates on the map below.
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Planning a whole trip? See where to stay at Michigan’s top lakes →
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Fishing Hidden Lake
Nearby Lakes in Keweenaw County
Frequently asked questions about Hidden Lake
Where is Hidden Lake?
- Hidden Lake is a lake in Keweenaw County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Hidden Lake?
- Hidden Lake in Keweenaw County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 2.5 ft visibility. Phosphorus: 27.5 µg/L.
Is Hidden Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Hidden Lake?
- Hidden Lake typically sits around 70°F at the surface in August, from 22 EPA Water Quality Portal field readings (2011–2024). That is a typical value for the month, not a live reading.
Are there campgrounds on Hidden Lake?
- Hidden Lake has 3 public campgrounds from USGS The National Map within 5 km, including Duncan Narrows, Rock Harbor, Merrit Lane. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
Explore Hidden Lake across LakeQuality
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Species activity outlook by water temperature and season
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Where this data comes from
6 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- National Park Service Water Resources Division
11NPSWRD_WQX6 samples · 2024
Analytical methods
- Secchi Disk
- Alkaline Persulfate Digestion for Total N and P in Water
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Public campgrounds from USGS The National Map Structures, within about 3 miles