Lake Chabot
Lake Chabot in Alameda County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.3 ft visibility. Surface area: 340 acres.
- Clarity
- 5.3 ft
- Area
- 340 acres
- Public access
- Yes
Why Lake Chabot 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 Lake Chabot, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
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 Chabot is a 340-acre lake in Alameda County, California. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-07-28. Grade methodology: LakeGrade methodology.
Watch Lake Chabot water quality
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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 Lake Chabot
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 5.3 ft. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.3 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Chabot
Compare lakeside cabins, hotels, and vacation rentals near Lake Chabot in Alameda 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 Chabot
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 340 acres |
| Public Access | Yes |
No bathymetric survey has been published for Lake Chabot, so its depth is not documented here.
Recreation & Access
- Lake Chabot MarinaPublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fishing Lake Chabot
Reservoir Info (USACE NID)
Lake Chabot is a man-made reservoir impounded by the Chabot (completed 1892), built primarily for water supply on the San Leandro Creek; earth-type dam, 142 ft tall and 450 ft long.
- Surface area
- 340 ac
- Max storage
- 10,281 ac-ft
- Drainage area
- 41.4 sq mi
- Hazard class
- High
- Owner
- East Bay Municipal Utility District
Source: USACE National Inventory of Dams, NID ID CA00165 · Operator website
EPA Impairment Status
Lake Chabot is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit CAL2042003020060515154933 · Official waterbody report · Matched by proximity (0.53 km)
Nearby Lakes in Alameda County
Frequently asked questions about Lake Chabot
Where is Lake Chabot?
- Lake Chabot is a lake in Alameda County, California. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Lake Chabot?
- Lake Chabot in Alameda County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.3 ft visibility. Surface area: 340 acres.
Is Lake Chabot safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Chabot 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 Chabot?
- Lake Chabot has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Chabot Marina. Public access is listed as yes.
Explore Lake Chabot across LakeGrade
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Where this data comes from
3 measurements from 1 monitoring station, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- North American Lake Management Society
NALMS3 samples · 2021–2022
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory