Where is Calaveras Reservoir?

Calaveras Reservoir is a lake in Santa Clara County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.

Calaveras Reservoir

Santa Clara County, California1,186 acresView map Directions

No nutrient or algae sampling on record from SWRCB for this lake.

Area

1,186 acres

Surface area

Impaired · Mercury
Limited data

See the measurements Directions Where to stay

Calaveras Reservoir in Santa Clara County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 1186 acres.

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Calaveras Reservoir is a 1,186-acre lake in Santa Clara County, California.

Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.

What Calaveras Reservoir is good for

From access and monitoring records, not editorial picks.

Big water1,186 acres

Swimming conditions

No reading

Limited data

Nutrient and algae readings are not a swimming clearance. Calaveras Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.

Whether Calaveras Reservoir 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.

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Water quality measurements for Calaveras Reservoir

These are the measurements SWRCB publishes for Calaveras Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

No clarity data.

Ask about Calaveras Reservoir

Answers come straight from the public measurements and survey records on this page.

Lake Details

Surface area

1,186 acres

No bathymetric survey has been published for Calaveras Reservoir, so its depth is not documented here.

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Stays near Calaveras Reservoir

Compare lakeside cabins, hotels, and vacation rentals near Calaveras Reservoir in Santa Clara 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 Calaveras Reservoir

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Fishing Calaveras Reservoir

→ Calaveras Reservoir fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Calaveras Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Mercury

Designated uses not supporting: Fish consumption, Other.

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit CAL2043004920091208101255 · Official waterbody report

Nearby Lakes in Santa Clara County

Halls Valley Lake10.5 miView →Vasona Reservoir18 miView →Guadalupe Reservoir—View →Calero Reservoir—View →Almaden Reservoir—View →Stevens Creek Reservoir—View →

Frequently asked questions about Calaveras Reservoir

Where is Calaveras Reservoir?: Calaveras Reservoir is a lake in Santa Clara County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Calaveras Reservoir?: Calaveras Reservoir in Santa Clara County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 1186 acres.
Is Calaveras Reservoir safe to swim in?: Nutrient and algae readings are not a swimming clearance. Calaveras Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.