Lake Berryessa
Lake Berryessa in Napa County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 18083 acres.
- Area
- 18,083 acres
- Public access
- Yes
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Why Lake Berryessa 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 Lake Berryessa, 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.
Lake Berryessa is a 18,083-acre lake in Napa County, California. Limited fish-species data available. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Lake Berryessa 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 Lake Berryessa
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 Lake Berryessa
Compare lakeside cabins, hotels, and vacation rentals near Lake Berryessa in Napa 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 Lake Berryessa
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 18,083 acres |
| Public Access | Yes |
No bathymetric survey has been published for Lake Berryessa, so its depth is not documented here.
Recreation & Access
- Oak Shores Day UsePublic
- Lake Berryessa Seaplane BaseSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Berryessa
Nearby Lakes in Napa County
Frequently asked questions about Lake Berryessa
Where is Lake Berryessa?
- Lake Berryessa is a lake in Napa 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 Lake Berryessa?
- Lake Berryessa in Napa County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 18083 acres.
Is Lake Berryessa safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Berryessa is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Lake Berryessa?
- Lake Berryessa has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Oak Shores Day Use, Lake Berryessa Seaplane Base. Public access is listed as yes.
Explore Lake Berryessa across LakeQuality
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Where this data comes from
Measurements for Lake Berryessa come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory