Siskiyou County: lake and river algae advisories
31 waters in Siskiyou County appear in the state's harmful algal bloom records. Waters whose latest record is an advisory come first.
| Water | Latest record |
|---|---|
| Butte Creek | Caution advisory, last posted Jun 27, 2025. No all-clear recorded. |
| Copco Reservoir | Danger advisory, last posted Nov 7, 2023. No all-clear recorded. |
| Iron Gate Reservoir | Danger advisory, last posted Nov 7, 2023. No all-clear recorded. |
| Kidder Creek | Algal mat alert sign, last posted Oct 13, 2026. No all-clear recorded. |
| Klamath River | Danger advisory, last posted Nov 7, 2023. No all-clear recorded. |
| Lake Shastina | Danger advisory, last posted May 14, 2025. No all-clear recorded. |
| Lower Klamath National Wildlife Refuge | Caution advisory, last posted Sep 23, 2025. No all-clear recorded. |
| Muskgrave Creek | Algal mat alert sign, last posted May 14, 2026. No all-clear recorded. |
| Salmon River | Algal mat alert sign, last posted Oct 9, 2026. No all-clear recorded. |
| Scott River | Caution advisory, last posted Oct 13, 2026. No all-clear recorded. |
| Seiad Creek | Caution advisory, last posted Jul 30, 2021. No all-clear recorded. |
| Tule Lake | Caution advisory, last posted Jul 28, 2025. No all-clear recorded. |
| Tule Lake Wildlife Refuge | Danger advisory, last posted Sep 24, 2026. No all-clear recorded. |
| Walker Creek | Caution advisory, last posted Jul 30, 2021. No all-clear recorded. |
| Applegate River | The state's latest record, from Jul 30, 2026, recommends no advisory. |
| Beans Gulch | The state's latest record, from Jun 24, 2022, recommends no advisory. |
| Burney Valley Creek | The state's latest record, from Sep 2, 2025, recommends no advisory. |
| Butcher Gulch | The state's latest record, from May 14, 2026, recommends no advisory. |
| Calf Creek | The state's latest record, from May 29, 2026, recommends no advisory. |
| Chelly Gulch | The state's latest record, from May 14, 2026, recommends no advisory. |
| Cherry Creek | The state's latest record, from Jul 7, 2022, recommends no advisory. |
| Dillon Creek | The state's latest record, from Nov 4, 2021, recommends no advisory. |
| Dry Gulch | The state's latest record, from May 21, 2025, recommends no advisory. |
| Indian Creek | The state's latest record, from Jun 24, 2021, recommends no advisory. |
| J.C. Boyle Reservoir | The state's latest record, from Jun 17, 2021, recommends no advisory. |
| Lake Siskiyou | The state's latest record, from Sep 8, 2022, recommends no advisory. |
| Moosehead Creek | The state's latest record, from Aug 10, 2023, recommends no advisory. |
| Shasta River | The state's latest record, from Jun 3, 2022, recommends no advisory. |
| South Fork Salmon River | The state's latest record, from Aug 27, 2024, recommends no advisory. |
| St. Claire Creek | The state's latest record, from Jul 7, 2022, recommends no advisory. |
| Wooley Creek | The state's latest record, from Jul 11, 2025, recommends no advisory. |