Pine Mountain Lake
Tuolumne County, California200 acresView mapDirections
SWRCB publishes the water-quality measurements for Pine Mountain Lake. Here is what has been measured.
- Limited data
Pine Mountain Lake in Tuolumne County, California has water-quality measurements published by SWRCB, shown here as reported. Water clarity: 18 ft visibility. Surface area: 200 acres.
Pine Mountain Lake is a 200-acre lake in Tuolumne County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-07-13. Methodology: how these readings are compared.
What Pine Mountain Lake is good for
From access and monitoring records, not editorial picks.
- Clear water18 ft of visibility
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Pine Mountain Lake 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 Pine Mountain Lake
These are the measurements SWRCB publishes for Pine Mountain Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 18 ft down. TSI 35.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 18ft | 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. | 35 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Pine Mountain Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
200 acres
No bathymetric survey has been published for Pine Mountain Lake, so its depth is not documented here.
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Stays near Pine Mountain Lake
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Fishing Pine Mountain Lake
Reservoir Info (USACE NID)
Pine Mountain Lake is a man-made reservoir impounded by the Big Creek (completed 1969), built primarily for water supply on the Big Creek; earth-type dam, 120 ft tall and 480 ft long.
- Surface area
- 200 ac
- Max storage
- 7,650 ac-ft
- Drainage area
- 25.6 sq mi
- Hazard class
- High
- Owner
- Pine Mountain Lake Association
All listed purposes: Water Supply;Recreation.
Source: USACE National Inventory of Dams, NID ID CA00652 · Operator website · Matched by proximity (0.81 km)
Nearby Lakes in Tuolumne County
Frequently asked questions about Pine Mountain Lake
Where is Pine Mountain Lake?
- Pine Mountain Lake 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 Pine Mountain Lake?
- Pine Mountain Lake in Tuolumne County, California has water-quality measurements published by SWRCB, shown here as reported. Water clarity: 18 ft visibility. Surface area: 200 acres.
Is Pine Mountain Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
1 measurement from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- North American Lake Management Society
NALMS1 sample · 2021
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.