Salmon Creek: toxic algae advisories

Salmon Creek, Sonoma County. See all Sonoma County waters.

What the state's records say

Algal mat alert sign, last posted Aug 27, 2026. No all-clear recorded.

2 reported spots here have an advisory with no all-clear recorded.

Reporting is voluntary, so the state may not have recorded an end even if conditions changed. Check posted signs and the official map.

What this level asks: The state recorded an advisory of a type outside the Caution, Warning and Danger levels. Read the sign posted at the water.

Before you go, check the state's official algae page and any signs posted at the water.

Dogs at Salmon Creek

The state has an advisory on file for Salmon Creek (Algal mat alert sign), last posted Aug 27, 2026, and no all-clear recorded. Keep your dog out of the water and away from scum on the shore until the state records an end.

Reported spots

The state records each report at a spot, such as a beach or a boat ramp. Each spot's latest deciding record:

Each reported spot at Salmon Creek and its latest status
Spot	Status
Estuary	Algal mat alert sign, last posted Aug 27, 2026. No all-clear recorded.
Estuary	The state recorded an end date of Dec 15, 2022.
Salmon Creek Lagoon	Algal mat alert sign, last posted Jun 11, 2021. No all-clear recorded.

Advisory history

Every advisory record the state has published for Salmon Creek, newest first. "None" is the state's record that no advisory was recommended on that date. "NA" records do not change a status.

Advisory records for Salmon Creek, newest first
Date	Spot	State's level	Notes
Aug 27, 2026	Estuary	Algal mat alert sign	Advisory based on visual and toxins; Bottom/benthic bloom observed
Aug 20, 2026	Estuary	None	Testing results below posting triggers
Jul 2, 2026	Estuary	None	Testing results below posting triggers
May 19, 2026	Estuary	None	Testing results below posting triggers
May 19, 2026	Estuary	Algal mat general awareness sign	Testing results below posting triggers
Oct 31, 2025	Estuary	Algal mat general awareness sign	No cyano bloom w/photos; Posted algal mat general awareness; Visual monitoring only-absent bloom
Oct 1, 2025	Estuary	Algal mat alert sign	Bottom/benthic bloom observed
Aug 27, 2025	Estuary	Algal mat alert sign	Bottom/benthic bloom observed; Testing results below posting triggers
Jul 3, 2025	Estuary	Algal mat alert sign	Alert-high concentration toxins; Bottom/benthic bloom observed
May 19, 2025	Estuary	Algal mat alert sign	Alert-high concentration toxins; Bottom/benthic bloom observed
Oct 28, 2024	Estuary	Algal mat general awareness sign	No cyano bloom w/testing; Updates from routine monitoring program-organization
Aug 20, 2024	Estuary	Algal mat general awareness sign	No cyano bloom w/testing; Updates from routine monitoring program-organization
Jun 24, 2024	Estuary	Algal mat general awareness sign	No cyano bloom w/testing; Updates from routine monitoring program-organization
May 21, 2024	Estuary	Algal mat general awareness sign	End date recorded: Dec 31, 2023. Updates from routine monitoring program-organization
Dec 31, 2023	Estuary	Algal mat general awareness sign	End date recorded: Dec 31, 2023. De-posting advisory.
Oct 19, 2023	Estuary	Algal mat alert sign	Advisory based on visual and toxins; Bottom/benthic bloom observed; Updates from routine monitoring program-organization
Aug 18, 2023	Estuary	Algal mat alert sign	Advisory based on visual and toxins; Updates from routine monitoring program-organization
Jun 22, 2023	Estuary	Algal mat alert sign	Advisory based on visual and toxins; Updates from routine monitoring program-organization
Jun 22, 2023	Estuary	Algal mat alert sign	Advisory based on visual and toxins; Updates from routine monitoring program-organization
Dec 15, 2022	Estuary	General awareness	End date recorded: Dec 15, 2022. De-posting advisory.
Dec 15, 2022	Estuary	General awareness	End date recorded: Dec 15, 2022. De-posting advisory.
Oct 20, 2022	Estuary	Algal mat alert sign	Updates from routine monitoring program-organization; visual monitoring based advisory
Aug 31, 2022	Estuary	Algal mat alert sign	Updates from routine monitoring program-organization; visual monitoring based advisory
Aug 31, 2022	Estuary	Algal mat alert sign	Updates from routine monitoring program-organization; visual monitoring based advisory
Aug 31, 2022	Estuary	Algal mat alert sign	Updates from routine monitoring program-organization; visual monitoring based advisory
Jul 27, 2022	Estuary	Algal mat alert sign	Updates from routine monitoring program-organization
Jul 27, 2022	Estuary	Algal mat alert sign	Updates from routine monitoring program-organization
Jun 27, 2022	Estuary	Algal mat general awareness sign	Updates from routine monitoring program-organization
Jun 27, 2022	Estuary	Algal mat general awareness sign	Updates from routine monitoring program-organization
May 20, 2022	Estuary	Algal mat general awareness sign	Updates from routine monitoring program-organization
May 13, 2022	Estuary	None	Updates from routine monitoring program-organization
May 13, 2022	Estuary	None	Updates from routine monitoring program-organization
Jun 11, 2021	Salmon Creek Lagoon	Algal mat alert sign	Bottom/benthic bloom observed

Source

Advisory data: California State Water Resources Control Board, Freshwater Harmful Algal Bloom Program, via data.ca.gov (public domain). Advisories are recommendations; reporting is voluntary and incomplete. The state's data. An advisory ends only when the state records a later "None" (no advisory recommended) at the same spot, or an end date. A blank end date is unknown.