Pine Mountain Lake: toxic algae advisories
Pine Mountain Lake, Tuolumne County. See all Tuolumne County waters.
What the state's records say
Caution advisory, last posted Aug 21, 2025. No all-clear recorded.
Reporting is voluntary, so the state may not have recorded an end even if conditions changed. Check posted signs and the official map.
What this level asks: Algae that can make toxins may be present. Keep people, children and pets away from algae and scum, and do not let pets drink the water.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at Pine Mountain Lake
The state has an advisory on file for Pine Mountain Lake (Caution advisory), last posted Aug 21, 2025, and no all-clear recorded. Keep your dog out of the water and away from scum on the shore until the state records an end.
Reported spots
The state records each report at a spot, such as a beach or a boat ramp. Each spot's latest deciding record:
| Spot | Status |
|---|---|
| at Garrotte Creek Cove (536TUO217) | The state's latest record, from Aug 21, 2026, recommends no advisory. |
| Bass Pond west of Clements Rd (536TUO216) | Caution advisory, last posted Aug 21, 2025. No all-clear recorded. |
| Pine Mountain Lake Dam | The state's latest record, from Aug 28, 2024, recommends no advisory. |
| Pine Mountain Lake Lodge | The state's latest record, from May 24, 2024, recommends no advisory. |
| Midlake | The state's latest record, from Sep 8, 2022, recommends no advisory. |
Advisory history
Every advisory record the state has published for Pine Mountain Lake, newest first. "None" is the state's record that no advisory was recommended on that date. "NA" records do not change a status.
| Date | Spot | State's level | Notes |
|---|---|---|---|
| Aug 21, 2026 | at Garrotte Creek Cove (536TUO217) | None | Testing results below posting triggers |
| Jul 2, 2026 | at Garrotte Creek Cove (536TUO217) | None | Testing results below posting triggers |
| May 21, 2026 | at Garrotte Creek Cove (536TUO217) | None | Testing results below posting triggers |
| Aug 21, 2025 | Bass Pond west of Clements Rd (536TUO216) | Caution | Advisory based on visual and toxins; Lake-wide advisory |
| Jul 11, 2025 | at Garrotte Creek Cove (536TUO217) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 2, 2025 | Bass Pond west of Clements Rd (536TUO216) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 21, 2025 | at Garrotte Creek Cove (536TUO217) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 21, 2025 | Bass Pond west of Clements Rd (536TUO216) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 8, 2024 | Bass Pond west of Clements Rd (536TUO216) | Caution | Advisory based on visual and toxins; Lake-wide advisory |
| Oct 8, 2024 | Bass Pond west of Clements Rd (536TUO216) | Caution | Advisory based on visual and toxins; Lake-wide advisory |
| Aug 28, 2024 | Pine Mountain Lake Dam | None | Testing results below posting triggers |
| May 24, 2024 | Pine Mountain Lake Lodge | None | No cyano, other algae present. |
| May 24, 2024 | Pine Mountain Lake Lodge | Visual observation | No cyano bloom w/testing; Testing results below posting triggers |
| May 24, 2024 | Pine Mountain Lake Lodge | Visual observation | No cyano bloom w/testing; Testing results below posting triggers |
| Sep 8, 2022 | Midlake | None | No cyano bloom w/testing |
| Sep 8, 2022 | Pine Mountain Lake Dam | None | No cyano bloom w/testing |
| Sep 8, 2022 | Pine Mountain Lake Dam | None | No cyano bloom w/testing |
| Sep 8, 2022 | Midlake | None | Advisory based on visual and toxins |
| Jun 27, 2022 | Pine Mountain Lake Lodge | None | Advisory based on visual and toxins |
| Jun 27, 2022 | Midlake | None | Advisory based on visual and toxins |
| Jun 9, 2022 | Pine Mountain Lake Lodge | None | Advisory based on visual and toxins |
| Jun 9, 2022 | Midlake | None | Advisory based on visual and toxins |
Source
Advisory data: California State Water Resources Control Board, Freshwater Harmful Algal Bloom Program, via data.ca.gov (public domain). Advisories are recommendations; reporting is voluntary and incomplete. The state's data. An advisory ends only when the state records a later "None" (no advisory recommended) at the same spot, or an end date. A blank end date is unknown.