Donnell Lake
Donnell Lake in Tuolumne County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 421 acres.
- Area
- 421 acres
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Why Donnell 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 Donnell Lake, no water-quality sampling on record for this lake.
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 your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Donnell Lake is a 421-acre lake in Tuolumne County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Donnell Lake water quality
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Donnell Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Donnell Lake
Compare lakeside cabins, hotels, and vacation rentals near Donnell Lake in Tuolumne County, California — 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 Donnell Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 421 acres |
No bathymetric survey has been published for Donnell Lake, so its depth is not documented here.
Fishing Donnell Lake
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Frequently asked questions about Donnell Lake
Where is Donnell Lake?
- Donnell Lake is a lake in Tuolumne County, California. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Donnell Lake?
- Donnell Lake in Tuolumne County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 421 acres.
Is Donnell Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Donnell Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Donnell Lake across LakeQuality
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Where this data comes from
Measurements for Donnell Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.