Alameda County: lake and river algae advisories
22 waters in Alameda County appear in the state's harmful algal bloom records. Waters whose latest record is an advisory come first.
| Water | Latest record |
|---|---|
| Berkeley Aquatic Park | Caution advisory, last posted Oct 18, 2024. No all-clear recorded. |
| High Valley Pond | Danger advisory, last posted Oct 29, 2021. No all-clear recorded. |
| Lago Los Osos | Caution advisory, last posted Oct 9, 2026. No all-clear recorded. |
| Lake Chabot | Danger advisory, last posted Oct 16, 2026. No all-clear recorded. |
| Lake Del Valle | Danger advisory, last posted Oct 16, 2026. No all-clear recorded. |
| Lake Merritt | Caution advisory, last posted Jun 5, 2025. No all-clear recorded. |
| Lake Temescal | Danger advisory, last posted Oct 16, 2026. No all-clear recorded. |
| Lakeshore Park | Visual observation, last posted Apr 29, 2024. No all-clear recorded. |
| Oakland Estuary | Caution advisory, last posted Aug 8, 2022. No all-clear recorded. |
| Quarry Lakes | Danger advisory, last posted Oct 16, 2026. No all-clear recorded. |
| San Francisco Bay | General awareness, last posted Jul 28, 2025. No all-clear recorded. |
| San Francisco Bay, Central | Visual observation, last posted Aug 1, 2023. No all-clear recorded. |
| San Francisco Bay, Lower | Visual observation, last posted Aug 16, 2024. No all-clear recorded. |
| Shadow Cliffs Arroyo | Caution advisory, last posted Dec 31, 2020. No all-clear recorded. |
| Shadow Cliffs Lake | Caution advisory, last posted Oct 16, 2026. No all-clear recorded. |
| Wildcat Creek | Caution advisory, last posted Jul 10, 2025. No all-clear recorded. |
| Arroyo Valle | The state's latest record, from Mar 9, 2018, recommends no advisory. |
| Bethany Reservoir | The state's latest record, from Sep 26, 2024, recommends no advisory. |
| Big Break Regional Shoreline | The state's latest record, from Dec 8, 2022, recommends no advisory. |
| Dyer Reservoir | The state's latest record, from Oct 19, 2026, recommends no advisory. |
| Redwood Creek | The state's latest record, from Jun 15, 2023, recommends no advisory. |
| San Francisco Bay, South | The state recorded an end date of Oct 14, 2022. |