Humboldt County: lake and river algae advisories
20 waters in Humboldt County appear in the state's harmful algal bloom records. Waters whose latest record is an advisory come first.
| Water | Latest record |
|---|---|
| Big Lagoon | Warning advisory, last posted Oct 15, 2020. No all-clear recorded. |
| Canoe Creek | Algal mat general awareness sign, last posted Sep 20, 2021. No all-clear recorded. |
| Eel River | Caution advisory, last posted Sep 16, 2026. No all-clear recorded. |
| Grizzly Creek | Caution advisory, last posted Oct 19, 2020. No all-clear recorded. |
| Klamath River | Danger advisory, last posted Nov 3, 2025. No all-clear recorded. |
| Lost Man Creek | Caution advisory, last posted Aug 27, 2021. No all-clear recorded. |
| Mad River | Danger advisory, last posted Sep 15, 2026. No all-clear recorded. |
| South Fork Eel River | Caution advisory, last posted Oct 9, 2026. No all-clear recorded. |
| Stone Lagoon | Danger advisory, last posted Oct 19, 2020. No all-clear recorded. |
| Trinity River | Caution advisory, last posted Oct 19, 2026. No all-clear recorded. |
| Van Duzen River | Caution advisory, last posted Sep 16, 2026. No all-clear recorded. |
| Blue Creek | Reports on file, with no advisory level the state has classified. |
| Cheenitch Creek | The state's latest record, from Jun 3, 2022, recommends no advisory. |
| Horse Mountain Creek | The state's latest record, from Aug 13, 2026, recommends no advisory. |
| Humboldt Bay | The state's latest record, from Aug 16, 2023, recommends no advisory. |
| Little Lost Man Creek | The state's latest record, from Sep 8, 2022, recommends no advisory. |
| Sholes Creek | The state's latest record, from Aug 13, 2026, recommends no advisory. |
| Squaw Creek | The state's latest record, from Sep 8, 2022, recommends no advisory. |
| Tepee Creek | The state's latest record, from May 29, 2026, recommends no advisory. |
| Unnamed Trib to Oils Creek | The state's latest record, from Aug 13, 2026, recommends no advisory. |