Three Mile Slough: toxic algae advisories
Three Mile Slough, Sacramento County. See all Sacramento County waters.
What the state's records say
Visual observation, last posted Nov 6, 2023. 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 Three Mile Slough
The state has an advisory on file for Three Mile Slough (Visual observation), last posted Nov 6, 2023, 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 San Joaquin River | Visual observation, last posted Nov 6, 2023. No all-clear recorded. |
| near San Joaquin River (TSL) | The state's latest record, from Nov 30, 2022, recommends no advisory. |
| near San Joaquin River | The state's latest record, from Nov 18, 2021, recommends no advisory. |
| Brannan Island State Rec Area boat dock | The state's latest record, from Mar 5, 2021, recommends no advisory. |
Advisory history
Every advisory record the state has published for Three Mile Slough, 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 |
|---|---|---|---|
| Nov 6, 2023 | near San Joaquin River | Visual observation | Updates from routine monitoring program-organization; Visual monitoring only-present bloom |
| Oct 17, 2023 | near San Joaquin River | Visual observation | Updates from routine monitoring program-organization; Visual monitoring only-present bloom |
| Aug 25, 2023 | near San Joaquin River | NA - refer to Report Details | Updates from routine monitoring program-organization; Visual monitoring only-absent bloom |
| Jul 24, 2023 | near San Joaquin River | NA - refer to Report Details | Updates from routine monitoring program-organization; Visual monitoring only-absent bloom |
| May 17, 2023 | near San Joaquin River | None | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Apr 20, 2023 | near San Joaquin River | None | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Feb 21, 2023 | near San Joaquin River | None | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Jan 30, 2023 | near San Joaquin River | None | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Nov 30, 2022 | near San Joaquin River (TSL) | None | visual monitoring based advisory |
| Nov 1, 2022 | near San Joaquin River (TSL) | Caution | visual monitoring based advisory |
| Sep 30, 2022 | near San Joaquin River (TSL) | Caution | visual monitoring based advisory |
| Sep 19, 2022 | near San Joaquin River (TSL) | Caution | visual monitoring based advisory |
| Jul 6, 2022 | near San Joaquin River (TSL) | Caution | visual monitoring based advisory |
| Jun 2, 2022 | near San Joaquin River (TSL) | None | visual monitoring based advisory |
| May 4, 2022 | near San Joaquin River (TSL) | None | visual monitoring based advisory |
| Apr 1, 2022 | near San Joaquin River (TSL) | None | visual monitoring based advisory |
| Nov 18, 2021 | near San Joaquin River | None | Testing results below posting triggers |
| Mar 5, 2021 | Brannan Island State Rec Area boat dock | 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.