Merced County: lake and river algae advisories
5 waters in Merced County appear in the state's harmful algal bloom records. Waters whose latest record is an advisory come first.
| Water | Latest record |
|---|---|
| O'Neill Forebay | Caution advisory, last posted Dec 19, 2022. No all-clear recorded. |
| San Luis Reservoir | Danger advisory, last posted Oct 19, 2026. No all-clear recorded. |
| California Aqueduct | Reports on file, with no advisory level the state has classified. |
| Los Banos Creek Reservoir | The state's latest record, from Jul 21, 2025, recommends no advisory. |
| Volta State Wildlife area | The state recorded an end date of Dec 28, 2022. |