Lake Notice Lake & river toxic algae advisories

Riverside County: lake and river algae advisories

40 waters in Riverside County appear in the state's harmful algal bloom records. Waters whose latest record is an advisory come first.

WaterLatest record
Baker PondCaution advisory, last posted Oct 11, 2022. No all-clear recorded.
Ben Williams River Wildlife RefugeWarning advisory, last posted Oct 21, 2022. No all-clear recorded.
Big Bear LakeDanger advisory, last posted Aug 28, 2024. No all-clear recorded.
Canyon LakeCaution advisory, last posted Sep 2, 2026. No all-clear recorded.
Colorado RiverDanger advisory, last posted Mar 30, 2026. No all-clear recorded.
Diamond valley lakeDanger advisory, last posted May 8, 2026. No all-clear recorded.
Gunnerson PondCaution advisory, last posted Oct 11, 2022. No all-clear recorded.
Harveston LakeCaution advisory, last posted Aug 31, 2026. No all-clear recorded.
Imperial Wildlife Area Wister UnitCaution advisory, last posted Dec 10, 2019. No all-clear recorded.
Lake ElsinoreDanger advisory, last posted Sep 24, 2026. No all-clear recorded.
Lake EvansCaution advisory, last posted Aug 1, 2024. No all-clear recorded.
Lake HemetDanger advisory, last posted Sep 2, 2026. No all-clear recorded.
Lake PerrisDanger advisory, last posted Feb 27, 2023. No all-clear recorded.
Mystic LakeDanger advisory, last posted Sep 9, 2024. No all-clear recorded.
North Fork San Jacinto CreekAlgal mat alert sign, last posted May 10, 2024. No all-clear recorded.
Reflection LakeCaution advisory, last posted Jul 11, 2024. No all-clear recorded.
Salton SeaWarning advisory, last posted Jul 16, 2021. No all-clear recorded.
Salton SeaCaution advisory, last posted May 17, 2024. No all-clear recorded.
San Jacinto Wildlife AreaCaution advisory, last posted Oct 29, 2020. No all-clear recorded.
Santa Ana RiverCaution advisory, last posted Jul 14, 2022. No all-clear recorded.
Sheffield ParkAlgal mat alert sign, last posted May 11, 2023. No all-clear recorded.
Stone CreekAlgal mat alert sign, last posted Jun 19, 2026. No all-clear recorded.
Temecula CreekAlgal mat alert sign, last posted Oct 16, 2023. No all-clear recorded.
Unnamed pondsCaution advisory, last posted Mar 20, 2017. No all-clear recorded.
Vail LakeCaution advisory, last posted Jun 24, 2024. No all-clear recorded.
Barton CreekThe state's latest record, from Jun 19, 2026, recommends no advisory.
Civic Center ParkThe state recorded an end date of Jul 1, 2026.
Cole CreekThe state's latest record, from May 10, 2024, recommends no advisory.
Havasu LakeThe state's latest record, from Aug 31, 2026, recommends no advisory.
Hemet Golf CourseThe state's latest record, from Aug 2, 2017, recommends no advisory.
Indian CreekThe state's latest record, from Jun 19, 2026, recommends no advisory.
Jenks LakeThe state's latest record, from Sep 15, 2025, recommends no advisory.
Lake CahuillaThe state's latest record, from May 20, 2024, recommends no advisory.
Lake HavasuThe state's latest record, from Dec 12, 2022, recommends no advisory.
Lake SkinnerThe state's latest record, from Jul 7, 2022, recommends no advisory.
Murrieta CreekThe state's latest record, from Oct 16, 2023, recommends no advisory.
San Jacinto RiverThe state's latest record, from May 3, 2024, recommends no advisory.
Strawberry CreekThe state's latest record, from May 17, 2024, recommends no advisory.
Temescal CreekThe state's latest record, from May 3, 2024, recommends no advisory.
Temescal WashThe state's latest record, from May 3, 2024, recommends no advisory.