Mirror Lake
Mirror Lake in Hennepin County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.9 ft visibility.
- Clarity
- 3.9 ft
- Public access
- No
- Ice-out
- Apr 15
- Open water
- 225 days
Next lake in Hennepin County
Why Mirror Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: 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 Mirror Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, but not phosphorus and 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 MPCA and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Mirror Lake is a lake in Hennepin County, Minnesota. Limited fish-species data available. No public access — the lake is private or restricted.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2020-09-05. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Mirror Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 3.9 ft. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.9 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Mirror Lake
Compare lakeside cabins, hotels, and vacation rentals near Mirror Lake in Hennepin County, Minnesota — 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 Mirror Lake
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Fishing Mirror Lake
Ice Season
Historical ice data from Minnesota DNR (6 observations).
Estimated open water season: 225 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2007-03-26 (2007) | 2008-04-16 (2008) |
| Ice-In | 2007-11-25 (2007) | 2006-12-01 (2006) |
Most recent ice-out: 2008-04-16
Graded lakes near Mirror Lake
Mirror Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Hennepin County
Frequently asked questions about Mirror Lake
What is the water quality grade for Mirror Lake?
- Mirror Lake in Hennepin County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.9 ft visibility.
Is Mirror Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Mirror Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
When does Mirror Lake thaw?
- Mirror Lake typically has ice-out around Apr 15. Ice typically forms around Nov 26. The open water season is approximately 225 days.
Explore Mirror Lake across LakeGrade
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Where this data comes from
2 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA2 samples · 2020
Analytical methods
- Field measurement/observation, generic method
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
Ice data from Minnesota DNR Climate