Toxic algae in Tuolumne County, California
11 lakes and waterways have harmful algal bloom reports in California's official data.
Lakes with bloom history
| Lake | Years with reports | Most recent |
|---|---|---|
| Pine Mountain Lake | 3 | 2025 |
| Tuolumne River | 4 | 2026 |
| New Melones Reservoir | 3 | 2021 |
| Stanislaus River | 2 | 2020 |
Other waterbodies with a report
These have one or two reports in a single year, so there isn't enough history for a page of their own yet.
- Bass Pond (2024)
- Clavey River (2021)
- Dry Meadow Creek (2024)
- Hells Hollow Creek (2025)
- Jawbone Creek (2021)
- Parker Pass Creek (2025)
- Rock Creek (2025)
Source: California State Water Resources Control Board, official data. For current conditions see the California HABs Portal map.