Modoc County: lake and river algae advisories
9 waters in Modoc County appear in the state's harmful algal bloom records. Waters whose latest record is an advisory come first.
| Water | Latest record |
|---|---|
| Ash Creek | Caution advisory, last posted Jul 1, 2021. No all-clear recorded. |
| Donovan Reservoir | Visual observation, last posted Aug 2, 2023. No all-clear recorded. |
| Fitzhugh Creek | Caution advisory, last posted Sep 29, 2021. No all-clear recorded. |
| Mill Creek | Algal mat alert sign, last posted Aug 27, 2026. No all-clear recorded. |
| Owl Creek | Algal mat alert sign, last posted Aug 27, 2026. No all-clear recorded. |
| Turner Creek | Algal mat alert sign, last posted Jul 30, 2024. No all-clear recorded. |
| Twelvemile Creek | Algal mat alert sign, last posted Aug 27, 2026. No all-clear recorded. |
| West Valley Reservoir | Caution advisory, last posted Jul 31, 2026. No all-clear recorded. |
| Emerson Creek | The state's latest record, from Aug 27, 2026, recommends no advisory. |