Toxic algae in Sierra County, California
9 lakes and waterways have harmful algal bloom reports in California's official data.
Lakes with bloom history
| Lake | Years with reports | Most recent |
|---|---|---|
| Oregon Creek | 2 | 2022 |
| Slate Creek | 2 | 2026 |
| Pass Creek | 2 | 2026 |
| Stampede Reservoir | 2 | 2023 |
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.
- Cold Stream Creek (2021)
- Lavezzola Creek (2026)
- Lincoln Creek (2021)
- Little Mud Flat Lake (2021)
- Tributary To Pass Creek (2026)
Source: California State Water Resources Control Board, official data. For current conditions see the California HABs Portal map.