Fosdick Lake
Fosdick Lake in Morrison County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8.9 ft visibility. Chlorophyll-a (algae): 7.1 µg/L.
- Clarity
- 8.9 ft
- Typical in August
- 75°F
- Trend
- → Stable
- Public access
- No
Next lake in Morrison County
Why Fosdick 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 Fosdick Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity and algae (chlorophyll-a), but not phosphorus.
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.
Fosdick Lake is a lake in Morrison 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 2025-10-01. 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 Fosdick Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Moderate clarity, visible to about 8.9 ft. Chlorophyll-a: 7.1 µg/L. Trophic State Index: 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.9 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 7.1 µg/L | Not graded |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Fosdick Lake
Compare lakeside cabins, hotels, and vacation rentals near Fosdick Lake in Morrison 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 Fosdick Lake
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Water Temperature
Fosdick Lake typically sits around 75°F at the surface in August. Summer average is about 72°F. Usually warmest in Aug (about 75°F) and coldest in May (about 65°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 70 field readings (2021–2025) via the EPA Water Quality Portal. See the full Fosdick Lake water temperature breakdown →
Fishing Fosdick Lake
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.001 m/yr | 6 |
Graded lakes near Fosdick Lake
Fosdick Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Morrison County
Frequently asked questions about Fosdick Lake
What is the water quality grade for Fosdick Lake?
- Fosdick Lake in Morrison County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8.9 ft visibility. Chlorophyll-a (algae): 7.1 µg/L.
Is Fosdick Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Fosdick Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Algae concentration (chlorophyll-a) is 7.1 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Fosdick Lake?
- Fosdick Lake typically sits around 75°F at the surface in August, from 70 EPA Water Quality Portal field readings (2021–2025). That is a typical value for the month, not a live reading.
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Where this data comes from
43 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA43 samples · 2020–2025
Analytical methods
- Field measurement/observation, generic method
- 10200 H ~ Chlorophyll a-b-c Determination
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.