Toxic algae in Siskiyou County, California
28 lakes and waterways have harmful algal bloom reports in California's official data.
Lakes with bloom history
| Lake | Years with reports | Most recent |
|---|---|---|
| Copco Reservoir | 7 | 2023 |
| Iron Creek | 6 | 2022 |
| Klamath River | 5 | 2026 |
| Scott River | 4 | 2024 |
| Tule Lake Hydrologic Subarea | 2 | 2022 |
| Tule Lake Wildlife Refuge | 2 | 2025 |
| Butte Creek | 4 | 2025 |
| Lake Shastina | 4 | 2026 |
| Lake Siskiyou | 1 | 2022 |
| Iron Gate Reservoir | 1 | 2023 |
| J.C. Boyle Reservoir | 3 | 2023 |
| Salmon River | 3 | 2026 |
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.
- Applegate River (2026)
- Burney Valley Creek (2025)
- Calf Creek (2026)
- Cherry Creek (2022)
- Dillon Creek (2021)
- Indian Creek (2021)
- Kidder Creek (2026)
- Moosehead Creek (2023)
- Muskgrave Creek (2026)
- Seiad Creek (2021)
- Shasta River (2022)
- South Fork Salmon River (2024)
- St Claire Creek (2022)
- Tule Lake (2025)
- Walker Creek (2021)
- Wooley Creek (2025)
Source: California State Water Resources Control Board, official data. For current conditions see the California HABs Portal map.