Trinity Lake
Trinity Lake in Trinity County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 15587 acres.
- Area
- 15,587 acres
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Why Trinity 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 Trinity 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.
Trinity Lake is a 15,587-acre lake in Trinity County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Trinity 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 Trinity 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 Trinity Lake
Compare lakeside cabins, hotels, and vacation rentals near Trinity Lake in Trinity 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 Trinity Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 15,587 acres |
No bathymetric survey has been published for Trinity Lake, so its depth is not documented here.
Fishing Trinity Lake
Nearby Lakes in Trinity County
Frequently asked questions about Trinity Lake
Where is Trinity Lake?
- Trinity Lake is a lake in Trinity 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 Trinity Lake?
- Trinity Lake in Trinity County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 15587 acres.
Is Trinity Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Trinity Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
Measurements for Trinity Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.