Salmon River: toxic algae advisories
Salmon River, Siskiyou County. See all Siskiyou County waters.
What the state's records say
Algal mat alert sign, last posted Oct 9, 2026. 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 River
The state has an advisory on file for Salmon River (Algal mat alert sign), last posted Oct 9, 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:
| Spot | Status |
|---|---|
| near Somes Bar | Algal mat alert sign, last posted Oct 9, 2026. No all-clear recorded. |
| Salmon River, SF above Grizzly Creek | The state's latest record, from Jul 7, 2022, recommends no advisory. |
| at Klamath River confluence | The state's latest record, from Jun 24, 2021, recommends no advisory. |
Advisory history
Every advisory record the state has published for Salmon River, newest first. "None" is the state's record that no advisory was recommended on that date. "NA" records do not change a status.
| Date | Spot | State's level | Notes |
|---|---|---|---|
| Oct 9, 2026 | near Somes Bar | Algal mat alert sign | Bottom/benthic bloom observed; Updates from routine monitoring program-organization |
| Oct 1, 2026 | near Somes Bar | Algal mat alert sign | Bottom/benthic bloom observed; Updates from routine monitoring program-organization |
| Sep 24, 2026 | near Somes Bar | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 11, 2026 | near Somes Bar | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 28, 2026 | near Somes Bar | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 13, 2026 | near Somes Bar | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 7, 2022 | Salmon River, SF above Grizzly Creek | None | |
| Jun 24, 2021 | at Klamath River confluence | None | Testing results below posting triggers |
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.