Toxic algae in Trinity County, California
22 lakes and waterways have harmful algal bloom reports in California's official data.
Lakes with bloom history
| Lake | Years with reports | Most recent |
|---|---|---|
| Trinity River | 7 | 2026 |
| Ruth Lake | 4 | 2023 |
| Mad River | 2 | 2022 |
| Trinity Lake | 3 | 2023 |
| Barry Creek | 2 | 2021 |
| Ewing Reservoir | 3 | 2025 |
| Lewiston Lake | 2 | 2023 |
| Potato Creek | 2 | 2024 |
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.
- Anada Creek (2021)
- Canyon Creek (2021)
- Lewiston Reservoir (2021)
- Little Browns Creek (2022)
- Little French Creek (2024)
- New River (2021)
- North Fork Mad River Hydrologic Area (2021)
- North Fork Middle Fork Eel River (2025)
- Other Lake Or Reservoir (2018)
- Queatchumpah Creek (2026)
- Skycrest Lake (2021)
- South Fork Trinity River (2026)
- Tributary To Eel River (2026)
- Trinity River South Fork (2025)
Source: California State Water Resources Control Board, official data. For current conditions see the California HABs Portal map.