Toxic algae in Placer County, California
16 lakes and waterways have harmful algal bloom reports in California's official data.
Lakes with bloom history
| Lake | Years with reports | Most recent |
|---|---|---|
| American River | 7 | 2025 |
| Folsom Lake | 5 | 2026 |
| Lake Clementine | 5 | 2024 |
| North Fork American River | 2 | 2024 |
| Bear River | 3 | 2025 |
| Monumental Creek | 2 | 2024 |
| Cold Stream | 2 | 2026 |
| South Yuba River | 2 | 2022 |
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.
- Bear Creek (2025)
- Dollar Creek Reservior (2022)
- Duncan Creek (2021)
- Hidden Reservoir A/ (2020)
- Lake Estelle (2024)
- Other Lake Or Reservoir (2019)
- Pleasant Grove Creek South Fork (2024)
- Swan Lake (2018)
Source: California State Water Resources Control Board, official data. For current conditions see the California HABs Portal map.