Lake Temescal
Alameda County, California15 acresView mapDirections
SWRCB publishes the water-quality measurements for Lake Temescal. Here is what has been measured.
- Limited data
Lake Temescal in Alameda County, California has water-quality measurements published by SWRCB, shown here as reported. Water clarity: 6.2 ft visibility. Surface area: 15 acres.
Lake Temescal is a 15-acre lake in Alameda County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-07-24. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lake Temescal is safe to swim in today is a call for the California State Water Resources Control Board and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Temescal
These are the measurements SWRCB publishes for Lake Temescal, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 6.2 ft. TSI 51.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 6.2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 51 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Lake Temescal
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
15 acres
No bathymetric survey has been published for Lake Temescal, so its depth is not documented here.
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Fishing Lake Temescal
Reservoir Info (USACE NID)
Lake Temescal is a man-made reservoir impounded by the Lake Temescal (completed 1869), built primarily for water supply on the Temescal Creek; earth-type dam, 116 ft tall and 650 ft long.
- Surface area
- 15 ac
- Max storage
- 200 ac-ft
- Drainage area
- 2.7 sq mi
- Hazard class
- High
- Owner
- East Bay Regional Park District
Source: USACE National Inventory of Dams, NID ID CA00160 · Operator website
Nearby Lakes in Alameda County
Frequently asked questions about Lake Temescal
Where is Lake Temescal?
- Lake Temescal is a lake in Alameda County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Lake Temescal?
- Lake Temescal in Alameda County, California has water-quality measurements published by SWRCB, shown here as reported. Water clarity: 6.2 ft visibility. Surface area: 15 acres.
Is Lake Temescal safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Lake Temescal across LakeQuality
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Where this data comes from
3 measurements from 1 monitoring station, 2021–2023. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- North American Lake Management Society
NALMS3 samples · 2021–2023
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.