Monterey County: lake and river algae advisories
23 waters in Monterey County appear in the state's harmful algal bloom records. Waters whose latest record is an advisory come first.
| Water | Latest record |
|---|---|
| Arroyo Seco | Algal mat alert sign, last posted May 9, 2025. No all-clear recorded. |
| El Estero Lake | Caution advisory, last posted May 25, 2021. No all-clear recorded. |
| Lagunita Mirada Park | Caution advisory, last posted May 25, 2021. No all-clear recorded. |
| Lake San Antonio | Danger advisory, last posted Sep 4, 2026. No all-clear recorded. |
| Little Sur River | Algal mat alert sign, last posted Jul 8, 2026. No all-clear recorded. |
| Los Padres Reservoir | Caution advisory, last posted Oct 8, 2025. No all-clear recorded. |
| Monterey Bay | Caution advisory, last posted Oct 28, 2022. No all-clear recorded. |
| Nacimiento River | Algal mat alert sign, last posted Jul 3, 2026. No all-clear recorded. |
| Roberts Lake | Caution advisory, last posted May 25, 2021. No all-clear recorded. |
| Salmon Creek | Caution advisory, last posted Sep 1, 2021. No all-clear recorded. |
| San Antonio Lake | Caution advisory, last posted Aug 26, 2024. No all-clear recorded. |
| San Antonio River | Algal mat alert sign, last posted Jul 3, 2026. No all-clear recorded. |
| San Clemente Creek | Algal mat alert sign, last posted Jun 9, 2023. No all-clear recorded. |
| Skinner Creek | Algal mat alert sign, last posted Jul 8, 2026. No all-clear recorded. |
| Carmel River | The state's latest record, from Jul 8, 2026, recommends no advisory. |
| Laguna Creek | The state's latest record, from Jul 3, 2026, recommends no advisory. |
| Laguna Grande Regional Park | The state's latest record, from Sep 1, 2022, recommends no advisory. |
| Majella Creek | The state's latest record, from Sep 9, 2025, recommends no advisory. |
| Pine Canyon | The state's latest record, from May 1, 2025, recommends no advisory. |
| Piney Creek | The state's latest record, from Apr 8, 2026, recommends no advisory. |
| Salinas River | Reports on file, with no advisory level the state has classified. |
| Santa Lucia Creek | The state's latest record, from May 9, 2025, recommends no advisory. |
| Tassajara Creek | The state's latest record, from May 9, 2025, recommends no advisory. |