Turtle Lake East End
Turtle Lake East End in Cook County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar.
- Typical in August
- 76°F
- Trend
- → Stable
Next lake in Cook County
Why Turtle Lake East End 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 Turtle Lake East End, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
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.
Turtle Lake East End is a lake in Cook County, Minnesota. Water clarity is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-29. 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 Turtle Lake East End
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Where to stay near Turtle Lake East End
Compare lakeside cabins, hotels, and vacation rentals near Turtle Lake East End in Cook 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 Turtle Lake East End
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Water Temperature
Turtle Lake East End typically sits around 76°F at the surface in August. Summer average is about 73°F. Usually warmest in Aug (about 76°F) and coldest in May (about 51°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 68 field readings (2011–2025) via the EPA Water Quality Portal. See the full Turtle Lake East End water temperature breakdown →
Fishing Turtle Lake East End
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -10.222 m/yr | 4 |
| Phosphorus | ↑ Improving | -2.78 µg/L/yr | 4 |
| Chlorophyll-a | → Stable | -0.01 µg/L/yr | 4 |
Graded lakes near Turtle Lake East End
Turtle Lake East End has no grade, but these lakes within a short drive do.
Nearby Lakes in Cook County
Frequently asked questions about Turtle Lake East End
What is the water quality grade for Turtle Lake East End?
- Turtle Lake East End in Cook County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar.
Is Turtle Lake East End safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Turtle Lake East End is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
What is the water temperature of Turtle Lake East End?
- Turtle Lake East End typically sits around 76°F at the surface in August, from 68 EPA Water Quality Portal field readings (2011–2025). That is a typical value for the month, not a live reading.
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Where this data comes from
13 measurements from 1 monitoring station, 2021–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Grand Portage Reservation
GPC5_WQX13 samples · 2021–2025
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.