Santa Clara County: lake and river algae advisories
11 waters in Santa Clara County appear in the state's harmful algal bloom records. Waters whose latest record is an advisory come first.
| Water | Latest record |
|---|---|
| Arastradero Lake | Danger advisory, last posted Apr 2, 2025. No all-clear recorded. |
| Boronda Lake | Caution advisory, last posted Aug 27, 2024. No all-clear recorded. |
| Lake Almaden | Danger advisory, last posted Nov 8, 2024. No all-clear recorded. |
| Lake Cunningham | Danger advisory, last posted Oct 16, 2018. No all-clear recorded. |
| Upper Lake | Caution advisory, last posted Aug 29, 2025. No all-clear recorded. |
| Arroyo Hondo Creek | The state's latest record, from Jul 16, 2026, recommends no advisory. |
| Llagas Creek | The state's latest record, from Jul 16, 2026, recommends no advisory. |
| Shoreline Lake | The state's latest record, from Jun 27, 2024, recommends no advisory. |
| Stevens Creek Reservoir | Reports on file, with no advisory level the state has classified. |
| Swanson Creek | The state's latest record, from Jun 9, 2023, recommends no advisory. |
| Uvas Creek | The state's latest record, from Jul 16, 2026, recommends no advisory. |