Don Pedro Reservoir
Tuolumne County, California10,980 acresView mapDirections
No nutrient or algae sampling on record from SWRCB for this lake.
- Impaired · Mercury
- 490 ft max depth
- Limited data
Don Pedro Reservoir in Tuolumne County, California has water-quality measurements published by SWRCB, shown here as reported. Maximum depth: 490 ft. Surface area: 10980 acres.
Don Pedro Reservoir is a 10,980-acre lake in Tuolumne County, California with a maximum depth of 490 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
What Don Pedro Reservoir is good for
From access and monitoring records, not editorial picks.
- Deep water490 ft surveyed max depth
- Big water10,980 acres
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Don Pedro Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Don Pedro 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.
Water quality measurements for Don Pedro Reservoir
These are the measurements SWRCB publishes for Don Pedro 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 Don Pedro Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
490 ft
Surface area
10,980 acres
Shoreline
149.6 mi
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Fishing Don Pedro Reservoir
EPA Impairment Status
Don Pedro Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption, Other.
Source: EPA ATTAINS assessment unit CAL5363201020011203130844 · Official waterbody report
Nearby Lakes in Tuolumne County
Frequently asked questions about Don Pedro Reservoir
Where is Don Pedro Reservoir?
- Don Pedro Reservoir is a lake in Tuolumne County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Don Pedro Reservoir?
- Don Pedro Reservoir in Tuolumne County, California has water-quality measurements published by SWRCB, shown here as reported. Maximum depth: 490 ft. Surface area: 10980 acres.
Is Don Pedro Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Don Pedro Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is Don Pedro Reservoir?
- Don Pedro Reservoir has a maximum depth of 490 feet. The lake covers 10980 acres.
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Where this data comes from
Measurements for Don Pedro Reservoir come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database