Hidden Lake
Keweenaw County, MichiganView mapDirections
Not enough samples to grade — no EPA ecoregion for this lake, so the National Lakes Assessment condition thresholds cannot be applied. No letter yet. Here is what we do have.
- Limited data
Hidden Lake in Keweenaw County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.5 ft visibility. Phosphorus: 27.5 µg/L.
- Clarity
- 2.5 ft
- Typical in August
- 70°F
- Phosphorus
- 27.5 µg/L
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Stays near Hidden Lake
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Watch Hidden Lake’s letter
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Why Hidden Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Hidden Lake, no EPA ecoregion for this lake, so the National Lakes Assessment condition thresholds cannot be applied. Sampling here has recorded water clarity and phosphorus, but not algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by EGLE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Hidden Lake is a lake in Keweenaw County, Michigan.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2024-08-19. Grade methodology: LakeQuality methodology.
What Hidden Lake is good for
From access and monitoring records, not editorial picks.
- Camping3 public campgrounds nearby
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Hidden Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 2.5 ft of visibility. Phosphorus 27.5 µg/L. TSI 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 ft | Not graded |
| Phosphorus | 27.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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.
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
Fishing Hidden Lake
Graded lakes near Hidden Lake
Hidden Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Keweenaw County
Frequently asked questions about Hidden Lake
Where is Hidden Lake?
- Hidden Lake is a lake in Keweenaw County, Michigan. LakeQuality has not rated this lake (UNRATED) — no EPA ecoregion for this lake, so the National Lakes Assessment condition thresholds cannot be applied.
What is the water quality grade for Hidden Lake?
- Hidden Lake in Keweenaw County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.5 ft visibility. Phosphorus: 27.5 µg/L.
Is Hidden Lake safe to swim in?
- The letter is 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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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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Public campgrounds from USGS The National Map Structures, within about 3 miles