Toxic algae in Shasta County, California
15 lakes and waterways have harmful algal bloom reports in California's official data.
Lakes with bloom history
| Lake | Years with reports | Most recent |
|---|---|---|
| Shasta Lake | 4 | 2026 |
| Lake Britton | 8 | 2026 |
| Whiskeytown Lake | 3 | 2023 |
| Fall River Lake | 2 | 2026 |
| Sacramento River | 2 | 2022 |
| Whiskey Town Reservoir | 2 | 2019 |
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.
- Beartrap Creek (2026)
- Big Lake (2019)
- Clear Creek (2021)
- Hatchet Creek (2026)
- North Fork Battle Creek (2026)
- Oak St Ponds (2026)
- South Cow Creek (2024)
- Tom Neal Creek (2026)
- Waydalmem Creek (2026)
Source: California State Water Resources Control Board, official data. For current conditions see the California HABs Portal map.