Mendocino County: lake and river algae advisories
14 waters in Mendocino County appear in the state's harmful algal bloom records. Waters whose latest record is an advisory come first.
| Water | Latest record |
|---|---|
| Big River | Algal mat general awareness sign, last posted Sep 15, 2021. No all-clear recorded. |
| East Fork Russian River | Algal mat alert sign, last posted Sep 25, 2026. No all-clear recorded. |
| Gualala River | Caution advisory, last posted Jul 14, 2021. No all-clear recorded. |
| Lake Mendocino | General awareness, last posted Jul 3, 2025. No all-clear recorded. |
| Navarro River | Danger advisory, last posted Aug 27, 2026. No all-clear recorded. |
| South Fork Eel River | Caution advisory, last posted Oct 9, 2026. No all-clear recorded. |
| Cahto Creek | The state's latest record, from Nov 26, 2024, recommends no advisory. |
| Eel River | The state's latest record, from Aug 13, 2026, recommends no advisory. |
| Lily Pond | The state's latest record, from Oct 10, 2022, recommends no advisory. |
| Mill Creek | The state's latest record, from Mar 11, 2022, recommends no advisory. |
| North Fork Eel River | The state's latest record, from Sep 1, 2021, recommends no advisory. |
| Pudding Creek | The state's latest record, from Jun 29, 2022, recommends no advisory. |
| Russian River | The state's latest record, from Dec 15, 2022, recommends no advisory. |
| Trout Creek | The state's latest record, from Jun 10, 2022, recommends no advisory. |