Klamath River: toxic algae advisories
Klamath River, Siskiyou County. See all Siskiyou County waters.
What the state's records say
Danger advisory, last posted Nov 7, 2023. No all-clear recorded.
8 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: Toxins may be at levels that can seriously harm people and animals. Stay out of the water and keep children and pets away from the water and the shore.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at Klamath River
The state has an advisory on file for Klamath River (Danger advisory), last posted Nov 7, 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 |
|---|---|
| below Happy Camp (RM 101.3; Baseline) | The state's latest record, from Oct 9, 2026, recommends no advisory. |
| below Seiad (RM 128.5; Baseline) | The state's latest record, from Oct 9, 2026, recommends no advisory. |
| at Brown Bear River Access (RM 150.00; Public Health) | The state's latest record, from Oct 9, 2026, recommends no advisory. |
| at I-5 Rest Area (RM 179.20; Public Health) | The state's latest record, from Oct 9, 2026, recommends no advisory. |
| at Walker Bridge (RM 156.26; Baseline) | The state's latest record, from Sep 16, 2026, recommends no advisory. |
| below Iron Gate Reservoir | The state's latest record, from Sep 16, 2026, recommends no advisory. |
| below Indian Creek | The state's latest record, from Sep 4, 2026, recommends no advisory. |
| below Copco Dam (RM 196.45) | Warning advisory, last posted Nov 7, 2023. No all-clear recorded. |
| above Shovel Creek (RM 206.42) | The state's latest record, from Nov 7, 2023, recommends no advisory. |
| below USGS Gage (RM 219.50) | Reports on file, with no advisory level the state has classified. |
| below J.C. Boyle Dam (RM 224.60) | Reports on file, with no advisory level the state has classified. |
| below Iron Gate Reservoir. | The state's latest record, from Dec 16, 2022, recommends no advisory. |
| at Walker Bridge (RM 156.26) | The state's latest record, from Nov 10, 2022, recommends no advisory. |
| below Seiad (RM 128.5; Baseline) | The state's latest record, from Nov 10, 2022, recommends no advisory. |
| at I-5 Rest Area (RM 179.20; Public Health) | The state's latest record, from Oct 31, 2022, recommends no advisory. |
| at Brown Bear River Access (RM 150.00) | The state's latest record, from Oct 31, 2022, recommends no advisory. |
| below Happy Camp (RM 101.3; Baseline) | The state's latest record, from Oct 31, 2022, recommends no advisory. |
| below J.C. Boyle Dam (RM 224.60). | The state's latest record, from May 20, 2022, recommends no advisory. |
| below USGS Gage (RM 219.50). | The state's latest record, from May 20, 2022, recommends no advisory. |
| above Shovel Creek (RM 206.42) | The state's latest record, from Oct 20, 2022, recommends no advisory. |
| below Copco Dam | The state recorded an end date of Dec 16, 2022. |
| near Tree of Heaven | The state's latest record, from Nov 4, 2021, recommends no advisory. |
| below USGS Gage (RM 219.50) | The state's latest record, from Jul 21, 2021, recommends no advisory. |
| below J.C. Boyle Dam (RM 224.60) | The state's latest record, from Jul 21, 2021, recommends no advisory. |
| below Copco Dam (RM 196.45) | Danger advisory, last posted Jul 21, 2021. No all-clear recorded. |
| above Shovel Creek (RM 206.42) | The state's latest record, from Jul 21, 2021, recommends no advisory. |
| below Iron Gate | The state's latest record, from Jul 21, 2021, recommends no advisory. |
| below Seiad (RM 128.5; Baseline) | The state's latest record, from Jul 20, 2021, recommends no advisory. |
| below Happy Camp (RM 101.3; Baseline) | The state's latest record, from Jul 20, 2021, recommends no advisory. |
| at I-5 Rest Area?(RM 179.20; Public Health) | The state's latest record, from Jul 20, 2021, recommends no advisory. |
| at Brown Bear River Access (RM 150.00; Public Health) | The state's latest record, from Jul 20, 2021, recommends no advisory. |
| at Walker Bridge (RM 156.26; Baseline) | The state's latest record, from Jul 20, 2021, recommends no advisory. |
| Klamath River below Seiad (RM 128.5; Baseline) | Caution advisory, last posted Oct 19, 2020. No all-clear recorded. |
| Klamath River below Happy Camp (RM 101.3; Baseline) | Caution advisory, last posted Oct 19, 2020. No all-clear recorded. |
| Klamath River at Walker Bridge (RM 156.26; Baseline) | Caution advisory, last posted Oct 19, 2020. No all-clear recorded. |
| Klamath River at I-5 Rest Area?(RM 179.20; Public Health) | Caution advisory, last posted Oct 19, 2020. No all-clear recorded. |
| Klamath River at Brown Bear River Access (RM 150.00; Public Health) | Caution advisory, last posted Oct 19, 2020. No all-clear recorded. |
| Klamath River, below Iron Gate (KRBI) | Caution advisory, last posted Sep 21, 2020. No all-clear recorded. |
| Klamath River below Seiad Valley | Reports on file, with no advisory level the state has classified. |
| Klamath River below Happy Camp | Reports on file, with no advisory level the state has classified. |
| Klamath River at Brown Bear River Access | Reports on file, with no advisory level the state has classified. |
| Klamath River at Walker Bridge | Reports on file, with no advisory level the state has classified. |
| Klamath River between Iron Gate Reservoir and Walker Road Bridge | Reports on file, with no advisory level the state has classified. |
| Klamath River below Iron Gate Dam | Reports on file, with no advisory level the state has classified. |
| Klamath River at I-5 Rest Area | Reports on file, with no advisory level the state has classified. |
Advisory history
Every advisory record the state has published for Klamath 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 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 9, 2026 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 9, 2026 | at Brown Bear River Access (RM 150.00; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 9, 2026 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 24, 2026 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 24, 2026 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 24, 2026 | at Brown Bear River Access (RM 150.00; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 24, 2026 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 16, 2026 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 16, 2026 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 16, 2026 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 16, 2026 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 11, 2026 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 11, 2026 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 11, 2026 | at Brown Bear River Access (RM 150.00; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 11, 2026 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 4, 2026 | at Brown Bear River Access (RM 150.00; Public Health) | None | Updates from routine monitoring program-organization; Visual monitoring only-absent bloom |
| Sep 4, 2026 | below Indian Creek | None | Testing results below posting triggers; Updates from routine monitoring program-organization; Visual monitoring only-absent bloom |
| Aug 28, 2026 | below Indian Creek | Algal mat alert sign | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 28, 2026 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 28, 2026 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 28, 2026 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 28, 2026 | at Brown Bear River Access (RM 150.00; Public Health) | Algal mat alert sign | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 28, 2026 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 13, 2026 | below Indian Creek | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 13, 2026 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 13, 2026 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 13, 2026 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 13, 2026 | at Brown Bear River Access (RM 150.00; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 13, 2026 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 11, 2026 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 11, 2026 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 11, 2026 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 11, 2026 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Nov 25, 2025 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Nov 25, 2025 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Nov 25, 2025 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 16, 2025 | at Brown Bear River Access (RM 150.00; Public Health) | Algal mat general awareness sign | Updates from routine monitoring program-organization; Visual monitoring only-absent bloom |
| Sep 29, 2025 | at Brown Bear River Access (RM 150.00; Public Health) | Algal mat alert sign | Bottom/benthic bloom observed; Updates from routine monitoring program-organization; Visual monitoring only-present bloom |
| Aug 20, 2025 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 20, 2025 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 20, 2025 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 20, 2025 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 14, 2025 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 14, 2025 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 14, 2025 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 14, 2025 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 14, 2025 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 14, 2025 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Nov 6, 2024 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Nov 6, 2024 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Nov 6, 2024 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 17, 2024 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 17, 2024 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 17, 2024 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 17, 2024 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 20, 2024 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 20, 2024 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 20, 2024 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 20, 2024 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 5, 2024 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 5, 2024 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 5, 2024 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 16, 2024 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 16, 2024 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 16, 2024 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 16, 2024 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Dec 18, 2023 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Nov 20, 2023 | below Iron Gate Reservoir | Caution | Updates from routine monitoring program-organization |
| Nov 12, 2023 | below Iron Gate Reservoir | Caution | Updates from routine monitoring program-organization |
| Nov 7, 2023 | below Happy Camp (RM 101.3; Baseline) | Caution | Updates from routine monitoring program-organization |
| Nov 7, 2023 | below Seiad (RM 128.5; Baseline) | Caution | Updates from routine monitoring program-organization |
| Nov 7, 2023 | at Brown Bear River Access (RM 150.00; Public Health) | Caution | Updates from routine monitoring program-organization |
| Nov 7, 2023 | at Walker Bridge (RM 156.26; Baseline) | Caution | Updates from routine monitoring program-organization |
| Nov 7, 2023 | at I-5 Rest Area (RM 179.20; Public Health) | Caution | Updates from routine monitoring program-organization |
| Nov 7, 2023 | below Iron Gate Reservoir | Caution | Updates from routine monitoring program-organization |
| Nov 7, 2023 | below Copco Dam (RM 196.45) | Warning | Advisory based on visual and toxins; Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Nov 7, 2023 | above Shovel Creek (RM 206.42) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Nov 7, 2023 | below USGS Gage (RM 219.50) | NA - refer to Report Details | Updates from routine monitoring program-organization |
| Nov 7, 2023 | below J.C. Boyle Dam (RM 224.60) | NA - refer to Report Details | Updates from routine monitoring program-organization |
| Oct 6, 2023 | below Iron Gate Reservoir | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Oct 6, 2023 | below Happy Camp (RM 101.3; Baseline) | Caution | Updates from routine monitoring program-organization |
| Oct 6, 2023 | below Seiad (RM 128.5; Baseline) | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Oct 6, 2023 | at Brown Bear River Access (RM 150.00; Public Health) | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Oct 6, 2023 | at Walker Bridge (RM 156.26; Baseline) | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Oct 6, 2023 | at I-5 Rest Area (RM 179.20; Public Health) | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Oct 6, 2023 | below Iron Gate Reservoir | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Oct 2, 2023 | below Happy Camp (RM 101.3; Baseline) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 2, 2023 | below Seiad (RM 128.5; Baseline) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 2, 2023 | at Brown Bear River Access (RM 150.00; Public Health) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 2, 2023 | at I-5 Rest Area (RM 179.20; Public Health) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 21, 2023 | below Happy Camp (RM 101.3; Baseline) | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Sep 21, 2023 | below Seiad (RM 128.5; Baseline) | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Sep 21, 2023 | at Brown Bear River Access (RM 150.00; Public Health) | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Sep 21, 2023 | at Walker Bridge (RM 156.26; Baseline) | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Sep 21, 2023 | at I-5 Rest Area (RM 179.20; Public Health) | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Sep 21, 2023 | below Iron Gate Reservoir | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Sep 21, 2023 | below Copco Dam (RM 196.45) | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Sep 21, 2023 | above Shovel Creek (RM 206.42) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 21, 2023 | below USGS Gage (RM 219.50) | NA - refer to Report Details | Updates from routine monitoring program-organization |
| Sep 21, 2023 | below J.C. Boyle Dam (RM 224.60) | NA - refer to Report Details | Updates from routine monitoring program-organization |
| Sep 11, 2023 | at Walker Bridge (RM 156.26; Baseline) | Caution | Updates from routine monitoring program-organization |
| Sep 11, 2023 | below Happy Camp (RM 101.3; Baseline) | Caution | Updates from routine monitoring program-organization |
| Sep 11, 2023 | below Seiad (RM 128.5; Baseline) | Caution | Updates from routine monitoring program-organization |
| Sep 11, 2023 | at Brown Bear River Access (RM 150.00; Public Health) | Caution | Updates from routine monitoring program-organization |
| Sep 11, 2023 | at I-5 Rest Area (RM 179.20; Public Health) | Caution | Updates from routine monitoring program-organization |
| Sep 1, 2023 | below Iron Gate Reservoir | Caution | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 18, 2023 | at I-5 Rest Area (RM 179.20; Public Health) | Caution | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 18, 2023 | below Iron Gate Reservoir | Caution | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 18, 2023 | below Copco Dam (RM 196.45) | Caution | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 18, 2023 | above Shovel Creek (RM 206.42) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 18, 2023 | below USGS Gage (RM 219.50) | NA - refer to Report Details | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 18, 2023 | below J.C. Boyle Dam (RM 224.60) | NA - refer to Report Details | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 18, 2023 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 18, 2023 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 18, 2023 | at Brown Bear River Access (RM 150.00; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 18, 2023 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 18, 2023 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 6, 2023 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 6, 2023 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 6, 2023 | at Brown Bear River Access (RM 150.00; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 6, 2023 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 2, 2023 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 31, 2023 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 31, 2023 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 31, 2023 | at Brown Bear River Access (RM 150.00; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 31, 2023 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 31, 2023 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 31, 2023 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 27, 2023 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 27, 2023 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 27, 2023 | at Brown Bear River Access (RM 150.00; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 27, 2023 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 27, 2023 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 27, 2023 | below Copco Dam (RM 196.45) | Caution | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 27, 2023 | above Shovel Creek (RM 206.42) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 27, 2023 | below USGS Gage (RM 219.50) | NA - refer to Report Details | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 27, 2023 | below J.C. Boyle Dam (RM 224.60) | NA - refer to Report Details | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 18, 2023 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 18, 2023 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 18, 2023 | at Brown Bear River Access (RM 150.00; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 18, 2023 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 18, 2023 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 11, 2023 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 11, 2023 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 11, 2023 | at Brown Bear River Access (RM 150.00; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 11, 2023 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 30, 2023 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 30, 2023 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 30, 2023 | at Brown Bear River Access (RM 150.00; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 30, 2023 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 30, 2023 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 30, 2023 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 16, 2023 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 16, 2023 | below Copco Dam (RM 196.45) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 16, 2023 | above Shovel Creek (RM 206.42) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 16, 2023 | below USGS Gage (RM 219.50) | NA - refer to Report Details | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 16, 2023 | below J.C. Boyle Dam (RM 224.60) | NA - refer to Report Details | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 13, 2023 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 13, 2023 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 13, 2023 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 5, 2023 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 26, 2023 | at Walker Bridge (RM 156.26; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 26, 2023 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 26, 2023 | at Walker Bridge (RM 156.26; Baseline) | Blank in the state's file | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 26, 2023 | below Iron Gate Reservoir | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 24, 2023 | below Copco Dam (RM 196.45) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 24, 2023 | above Shovel Creek (RM 206.42) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 24, 2023 | below USGS Gage (RM 219.50) | NA - refer to Report Details | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 24, 2023 | below J.C. Boyle Dam (RM 224.60) | NA - refer to Report Details | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Dec 16, 2022 | below Iron Gate Reservoir. | None | End date recorded: Dec 16, 2022. Testing results below posting triggers; Updates from routine monitoring program-organization |
| Dec 16, 2022 | below Iron Gate Reservoir. | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Nov 28, 2022 | below Iron Gate Reservoir. | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Nov 10, 2022 | at Walker Bridge (RM 156.26) | None | End date recorded: Dec 16, 2022. Testing results below posting triggers; Updates from routine monitoring program-organization |
| Nov 10, 2022 | below Seiad (RM 128.5; Baseline) | None | End date recorded: Dec 16, 2022. Testing results below posting triggers; Updates from routine monitoring program-organization |
| Nov 10, 2022 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Nov 10, 2022 | at Walker Bridge (RM 156.26) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Nov 10, 2022 | below Iron Gate Reservoir. | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 31, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | End date recorded: Dec 16, 2022. Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 31, 2022 | at Brown Bear River Access (RM 150.00) | None | End date recorded: Dec 16, 2022. Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 31, 2022 | below Happy Camp (RM 101.3; Baseline) | None | End date recorded: Dec 16, 2022. Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 31, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 31, 2022 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 31, 2022 | at Brown Bear River Access (RM 150.00) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 31, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 20, 2022 | below J.C. Boyle Dam (RM 224.60). | NA - refer to Report Details | End date recorded: Dec 16, 2022. Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 20, 2022 | below USGS Gage (RM 219.50). | NA - refer to Report Details | End date recorded: Dec 16, 2022. Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 20, 2022 | above Shovel Creek (RM 206.42) | None | End date recorded: Dec 16, 2022. Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 20, 2022 | below Copco Dam | Caution | End date recorded: Dec 16, 2022. Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Oct 20, 2022 | below Iron Gate Reservoir. | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 20, 2022 | below Copco Dam | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Oct 20, 2022 | above Shovel Creek (RM 206.42) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 20, 2022 | below USGS Gage (RM 219.50). | NA - refer to Report Details | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 20, 2022 | below J.C. Boyle Dam (RM 224.60). | NA - refer to Report Details | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 20, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 20, 2022 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 20, 2022 | at Brown Bear River Access (RM 150.00) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 20, 2022 | at Walker Bridge (RM 156.26) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 20, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 18, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 18, 2022 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 18, 2022 | at Brown Bear River Access (RM 150.00) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 18, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 6, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 6, 2022 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 6, 2022 | at Brown Bear River Access (RM 150.00) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 6, 2022 | at Walker Bridge (RM 156.26) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 6, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 6, 2022 | below Iron Gate Reservoir. | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 28, 2022 | below J.C. Boyle Dam (RM 224.60). | NA - refer to Report Details | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 28, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 28, 2022 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 28, 2022 | at Brown Bear River Access (RM 150.00) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 28, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 28, 2022 | below Iron Gate Reservoir. | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 28, 2022 | below Copco Dam | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Sep 28, 2022 | above Shovel Creek (RM 206.42) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 28, 2022 | below USGS Gage (RM 219.50). | NA - refer to Report Details | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 28, 2022 | below J.C. Boyle Dam (RM 224.60). | NA - refer to Report Details | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 28, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 28, 2022 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 28, 2022 | at Brown Bear River Access (RM 150.00) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 28, 2022 | at Walker Bridge (RM 156.26) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 28, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 15, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 15, 2022 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 15, 2022 | at Brown Bear River Access (RM 150.00) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 15, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 7, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 7, 2022 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 7, 2022 | at Brown Bear River Access (RM 150.00) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 7, 2022 | at Walker Bridge (RM 156.26) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 7, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 7, 2022 | below Iron Gate Reservoir. | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 29, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 29, 2022 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 29, 2022 | at Brown Bear River Access (RM 150.00) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 29, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 24, 2022 | below Copco Dam | Caution | Alert-high concentration toxins; Updates from routine monitoring program-organization |
| Aug 24, 2022 | above Shovel Creek (RM 206.42) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 24, 2022 | below USGS Gage (RM 219.50). | NA - refer to Report Details | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 24, 2022 | below J.C. Boyle Dam (RM 224.60). | NA - refer to Report Details | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 18, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 18, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 18, 2022 | below Seiad (RM 128.5; Baseline) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 18, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| Aug 8, 2022 | below Iron Gate Reservoir. | None | Updates from routine monitoring program-organization |
| Aug 1, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Updates from routine monitoring program-organization |
| Aug 1, 2022 | below Seiad (RM 128.5; Baseline) | None | Updates from routine monitoring program-organization |
| Aug 1, 2022 | at Brown Bear River Access (RM 150.00) | None | Updates from routine monitoring program-organization |
| Aug 1, 2022 | at Walker Bridge (RM 156.26) | None | Updates from routine monitoring program-organization |
| Aug 1, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Updates from routine monitoring program-organization |
| Aug 1, 2022 | below Iron Gate Reservoir. | None | Updates from routine monitoring program-organization |
| Jul 28, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Updates from routine monitoring program-organization |
| Jul 28, 2022 | below Seiad (RM 128.5; Baseline) | None | Updates from routine monitoring program-organization |
| Jul 28, 2022 | at Brown Bear River Access (RM 150.00) | None | Updates from routine monitoring program-organization |
| Jul 28, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Updates from routine monitoring program-organization |
| Jul 25, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Updates from routine monitoring program-organization |
| Jul 25, 2022 | below Seiad (RM 128.5; Baseline) | None | Updates from routine monitoring program-organization |
| Jul 25, 2022 | at Brown Bear River Access (RM 150.00) | None | Updates from routine monitoring program-organization |
| Jul 25, 2022 | at Walker Bridge (RM 156.26) | None | Updates from routine monitoring program-organization |
| Jul 25, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Updates from routine monitoring program-organization |
| Jul 25, 2022 | below Iron Gate Reservoir. | None | Updates from routine monitoring program-organization |
| Jul 25, 2022 | below Copco Dam | Caution | Updates from routine monitoring program-organization |
| Jul 25, 2022 | above Shovel Creek (RM 206.42) | None | Updates from routine monitoring program-organization |
| Jul 25, 2022 | below USGS Gage (RM 219.50). | NA - refer to Report Details | Updates from routine monitoring program-organization |
| Jul 25, 2022 | below J.C. Boyle Dam (RM 224.60). | NA - refer to Report Details | Updates from routine monitoring program-organization |
| Jul 19, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Updates from routine monitoring program-organization |
| Jul 19, 2022 | below Seiad (RM 128.5; Baseline) | None | Updates from routine monitoring program-organization |
| Jul 19, 2022 | at Brown Bear River Access (RM 150.00) | None | Updates from routine monitoring program-organization |
| Jul 19, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Updates from routine monitoring program-organization |
| Jul 1, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Updates from routine monitoring program-organization |
| Jul 1, 2022 | below Seiad (RM 128.5; Baseline) | None | Updates from routine monitoring program-organization |
| Jul 1, 2022 | at Brown Bear River Access (RM 150.00) | None | Updates from routine monitoring program-organization |
| Jul 1, 2022 | at Walker Bridge (RM 156.26) | None | Updates from routine monitoring program-organization |
| Jul 1, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Updates from routine monitoring program-organization |
| Jul 1, 2022 | below Iron Gate Reservoir. | None | Updates from routine monitoring program-organization |
| Jun 21, 2022 | below Iron Gate Reservoir. | None | Updates from routine monitoring program-organization |
| Jun 21, 2022 | below Copco Dam | None | Updates from routine monitoring program-organization |
| Jun 21, 2022 | above Shovel Creek (RM 206.42) | None | Updates from routine monitoring program-organization |
| Jun 21, 2022 | below USGS Gage (RM 219.50). | NA - refer to Report Details | Updates from routine monitoring program-organization |
| Jun 21, 2022 | below J.C. Boyle Dam (RM 224.60). | NA - refer to Report Details | Updates from routine monitoring program-organization |
| Jun 13, 2022 | below Happy Camp (RM 101.3; Baseline) | None | Updates from routine monitoring program-organization |
| Jun 13, 2022 | below Seiad (RM 128.5; Baseline) | None | Updates from routine monitoring program-organization |
| Jun 13, 2022 | at Walker Bridge (RM 156.26) | None | Updates from routine monitoring program-organization |
| Jun 3, 2022 | below Iron Gate Reservoir. | None | Updates from routine monitoring program-organization |
| Jun 3, 2022 | below Seiad (RM 128.5; Baseline) | None | Updates from routine monitoring program-organization |
| Jun 3, 2022 | at Walker Bridge (RM 156.26) | None | Updates from routine monitoring program-organization |
| Jun 3, 2022 | at I-5 Rest Area (RM 179.20; Public Health) | None | Updates from routine monitoring program-organization |
| Jun 3, 2022 | below Iron Gate Reservoir. | None | Updates from routine monitoring program-organization |
| May 20, 2022 | below Copco Dam | None | Updates from routine monitoring program-organization |
| May 20, 2022 | above Shovel Creek (RM 206.42) | None | Updates from routine monitoring program-organization |
| May 20, 2022 | below USGS Gage (RM 219.50). | None | Updates from routine monitoring program-organization |
| May 20, 2022 | below J.C. Boyle Dam (RM 224.60). | None | Updates from routine monitoring program-organization |
| Nov 4, 2021 | near Tree of Heaven | None | Updates from routine monitoring program-organization |
| Jul 21, 2021 | below USGS Gage (RM 219.50) | None | Updates from routine monitoring program-organization |
| Jul 21, 2021 | below J.C. Boyle Dam (RM 224.60) | None | Updates from routine monitoring program-organization |
| Jul 21, 2021 | below Copco Dam (RM 196.45) | Danger | Advisory due to historical data. |
| Jul 21, 2021 | above Shovel Creek (RM 206.42) | None | Updates from routine monitoring program-organization |
| Jul 21, 2021 | below Iron Gate | None | Updates from routine monitoring program-organization |
| Jul 20, 2021 | below Seiad (RM 128.5; Baseline) | None | Updates from routine monitoring program-organization |
| Jul 20, 2021 | below Happy Camp (RM 101.3; Baseline) | None | Updates from routine monitoring program-organization |
| Jul 20, 2021 | at I-5 Rest Area?(RM 179.20; Public Health) | None | Updates from routine monitoring program-organization |
| Jul 20, 2021 | at Brown Bear River Access (RM 150.00; Public Health) | None | Updates from routine monitoring program-organization |
| Jul 20, 2021 | at Walker Bridge (RM 156.26; Baseline) | None | Updates from routine monitoring program-organization |
| Oct 19, 2020 | Klamath River below Seiad (RM 128.5; Baseline) | Caution | Advisory based on visual and toxins |
| Oct 19, 2020 | Klamath River below Happy Camp (RM 101.3; Baseline) | Caution | Advisory based on visual and toxins |
| Oct 19, 2020 | Klamath River at Walker Bridge (RM 156.26; Baseline) | Caution | Advisory based on visual and toxins |
| Oct 19, 2020 | Klamath River at I-5 Rest Area?(RM 179.20; Public Health) | Caution | Advisory based on visual and toxins |
| Oct 19, 2020 | Klamath River at Brown Bear River Access (RM 150.00; Public Health) | Caution | Advisory based on visual and toxins |
| Sep 21, 2020 | Klamath River, below Iron Gate (KRBI) | Caution | Advisory based on visual and toxins |
| Sep 29, 2018 | Klamath River below Seiad Valley | NA - refer to Report Details | |
| Sep 29, 2018 | Klamath River below Happy Camp | NA - refer to Report Details | |
| Sep 29, 2018 | Klamath River at Brown Bear River Access | NA - refer to Report Details | |
| Sep 29, 2018 | Klamath River at Walker Bridge | NA - refer to Report Details | |
| Sep 29, 2018 | Klamath River between Iron Gate Reservoir and Walker Road Bridge | NA - refer to Report Details | |
| Sep 29, 2018 | Klamath River below Iron Gate Dam | NA - refer to Report Details | |
| Sep 29, 2018 | Klamath River at I-5 Rest Area | NA - refer to Report Details |
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.