North Fork American River: toxic algae advisories
North Fork American River, Placer County. See all Placer County waters.
What the state's records say
Caution advisory, last posted Oct 23, 2024. No all-clear recorded.
5 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: Algae that can make toxins may be present. Keep people, children and pets away from algae and scum, and do not let pets drink the water.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at North Fork American River
The state has an advisory on file for North Fork American River (Caution advisory), last posted Oct 23, 2024, 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 |
|---|---|
| Oregon Bar | The state's latest record, from Oct 23, 2024, recommends no advisory. |
| Ponderosa Way | The state's latest record, from Oct 23, 2024, recommends no advisory. |
| Mineral Bar | Algal mat alert sign, last posted Oct 23, 2024. No all-clear recorded. |
| Mississippi Bar | The state's latest record, from Oct 23, 2024, recommends no advisory. |
| Rattlesnake Bar | The state's latest record, from Oct 23, 2024, recommends no advisory. |
| at Ponderosa Bridge | Caution advisory, last posted Sep 9, 2021. No all-clear recorded. |
| at Mineral Bar | Caution advisory, last posted Sep 3, 2021. No all-clear recorded. |
| at Yankee Jim's Bridge | Caution advisory, last posted Sep 3, 2021. No all-clear recorded. |
| North Fork American River, off Cardiac Bypass Trail near Oregon Bar River | Caution advisory, last posted Aug 25, 2019. No all-clear recorded. |
Advisory history
Every advisory record the state has published for North Fork American 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 23, 2024 | Oregon Bar | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 23, 2024 | Ponderosa Way | None | Updates from routine monitoring program-organization |
| Oct 23, 2024 | Mineral Bar | Algal mat alert sign | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 23, 2024 | Mississippi Bar | None | Updates from routine monitoring program-organization |
| Oct 23, 2024 | Rattlesnake Bar | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 23, 2024 | Rattlesnake Bar | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 23, 2024 | Oregon Bar | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 24, 2024 | Ponderosa Way | Algal mat alert sign | Updates from routine monitoring program-organization |
| Sep 24, 2024 | Mineral Bar | Algal mat alert sign | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 24, 2024 | Rattlesnake Bar | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 24, 2024 | Oregon Bar | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jul 25, 2024 | Rattlesnake Bar | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 25, 2024 | Mineral Bar | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jul 25, 2024 | Oregon Bar | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jul 25, 2024 | Oregon Bar | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Nov 2, 2023 | Mineral Bar | Algal mat alert sign | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Nov 2, 2023 | Oregon Bar | Algal mat alert sign | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Nov 2, 2023 | Rattlesnake Bar | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 12, 2023 | Rattlesnake Bar | Algal mat general awareness sign | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 12, 2023 | Rattlesnake Bar | Algal mat general awareness sign | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 12, 2023 | Mineral Bar | Algal mat general awareness sign | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 10, 2023 | Oregon Bar | Algal mat alert sign | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 1, 2023 | Mineral Bar | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 1, 2023 | Oregon Bar | Algal mat alert sign | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 1, 2023 | Rattlesnake Bar | Algal mat general awareness sign | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 21, 2023 | Oregon Bar | Algal mat alert sign | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jul 21, 2023 | Rattlesnake Bar | Algal mat alert sign | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Nov 18, 2022 | Oregon Bar | Algal mat alert sign | Advisory based on visual and toxins; Bottom/benthic bloom observed; Updates from routine monitoring program-organization |
| Nov 4, 2022 | Mineral Bar | Algal mat general awareness sign | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Nov 4, 2022 | Oregon Bar | Algal mat alert sign | Advisory based on visual and toxins; Bottom/benthic bloom observed; Updates from routine monitoring program-organization |
| Nov 4, 2022 | Mineral Bar | Algal mat alert sign | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 19, 2022 | Oregon Bar | Algal mat alert sign | Advisory based on visual and toxins; Bottom/benthic bloom observed; Updates from routine monitoring program-organization |
| Oct 19, 2022 | Mineral Bar | Algal mat alert sign | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 30, 2022 | Mineral Bar | Algal mat alert sign | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 30, 2022 | Oregon Bar | Algal mat alert sign | Advisory based on visual and toxins; Bottom/benthic bloom observed; Updates from routine monitoring program-organization |
| Sep 30, 2022 | Rattlesnake Bar | None | Advisory based on visual and toxins; No cyano bloom w/testing; Rec algal mat general awareness |
| Sep 2, 2022 | Rattlesnake Bar | None | Advisory based on visual and toxins; No cyano bloom w/testing; Rec algal mat general awareness |
| Sep 2, 2022 | Oregon Bar | Algal mat alert sign | Advisory based on visual and toxins; Bottom/benthic bloom observed; Updates from routine monitoring program-organization |
| Sep 2, 2022 | Mineral Bar | Algal mat general awareness sign | No cyano bloom w/testing; Rec algal mat general awareness; Updates from routine monitoring program-organization |
| Aug 24, 2022 | Rattlesnake Bar | None | Advisory based on visual and toxins; No cyano bloom w/testing; Rec algal mat general awareness |
| Aug 24, 2022 | Oregon Bar | Algal mat alert sign | Advisory based on visual and toxins; Bottom/benthic bloom observed; Updates from routine monitoring program-organization |
| Aug 3, 2022 | Mineral Bar | None | No cyano bloom w/testing; Rec algal mat general awareness; Updates from routine monitoring program-organization |
| Aug 3, 2022 | Oregon Bar | Algal mat alert sign | Bottom/benthic bloom observed |
| Aug 3, 2022 | Rattlesnake Bar | None | No cyano bloom w/testing |
| Aug 3, 2022 | Mineral Bar | None | No cyano bloom w/testing |
| Jul 21, 2022 | Rattlesnake Bar | None | No cyano bloom w/testing |
| Jul 21, 2022 | Mineral Bar | None | No cyano bloom w/testing |
| Jul 21, 2022 | Oregon Bar | Algal mat alert sign | Bottom/benthic bloom observed |
| Jul 21, 2022 | Mineral Bar | None | No cyano bloom w/testing |
| Jul 8, 2022 | Oregon Bar | Algal mat alert sign | Bottom/benthic bloom observed |
| Jul 6, 2022 | Oregon Bar | None | No cyano bloom w/testing |
| Jul 6, 2022 | Rattlesnake Bar | None | No cyano bloom w/testing |
| Jul 6, 2022 | Mineral Bar | None | No cyano bloom w/testing |
| Jun 17, 2022 | Oregon Bar | None | No cyano bloom w/testing |
| Jun 17, 2022 | Rattlesnake Bar | None | No cyano bloom w/testing |
| Jun 17, 2022 | Mineral Bar | None | No cyano bloom w/testing |
| May 25, 2022 | Oregon Bar | None | No cyano bloom w/testing |
| May 25, 2022 | Rattlesnake Bar | None | No cyano bloom w/testing |
| May 25, 2022 | Mineral Bar | None | No cyano bloom w/testing |
| Sep 9, 2021 | at Ponderosa Bridge | Caution | Advisory based on visual and toxins |
| Sep 3, 2021 | at Mineral Bar | Caution | Advisory based on visual and toxins |
| Sep 3, 2021 | at Yankee Jim's Bridge | Caution | Advisory based on visual and toxins |
| Aug 25, 2019 | North Fork American River, off Cardiac Bypass Trail near Oregon Bar River | Caution |
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.