Toxic algae in Lassen 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 |
|---|---|---|
| Eagle Lake | 8 | 2026 |
| Mountain Meadows Reservoir | 4 | 2026 |
| East Creek | 3 | 2026 |
| Rim Rock Lake | 2 | 2018 |
| Willow Lake | 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.
- Ash Creek (2021)
- Dodge Reservoir (2026)
- Dry Creek (2020)
- Lower Biscar Reservoir (2025)
Source: California State Water Resources Control Board, official data. For current conditions see the California HABs Portal map.