Upper Truckee River: toxic algae advisories
Upper Truckee River, El Dorado County. See all El Dorado County waters.
What the state's records say
Caution advisory, last posted Aug 7, 2026. No all-clear recorded.
4 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 Upper Truckee River
The state has an advisory on file for Upper Truckee River (Caution advisory), last posted Aug 7, 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 |
|---|---|
| below Portal drive (634UTR600) | Algal mat alert sign, last posted Aug 7, 2026. No all-clear recorded. |
| Trail of Kata Ct | The state's latest record, from Aug 29, 2025, recommends no advisory. |
| Upper Truckee River, above Christmas Valley (forest) (634UTR008) | Algal mat alert sign, last posted Aug 18, 2025. No all-clear recorded. |
| Elks Club | The state's latest record, from Jul 31, 2024, recommends no advisory. |
| Tahoe Keys Marina/Sailing Lagoon | The state's latest record, from Aug 29, 2023, recommends no advisory. |
| Upper Truckee River, downstream of STPUD station | Caution advisory, last posted Sep 29, 2020. No all-clear recorded. |
| Upper Truckee River | Caution advisory, last posted Sep 29, 2020. No all-clear recorded. |
Advisory history
Every advisory record the state has published for Upper Truckee 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 |
|---|---|---|---|
| Aug 7, 2026 | below Portal drive (634UTR600) | Algal mat alert sign | Updates from routine monitoring program-organization |
| Aug 29, 2025 | Trail of Kata Ct | None | Visual monitoring only-present bloom |
| Aug 29, 2025 | Trail of Kata Ct | Visual observation | Visual monitoring only-present bloom |
| Aug 18, 2025 | Upper Truckee River, above Christmas Valley (forest) (634UTR008) | Algal mat alert sign | Updates from routine monitoring program-organization |
| Oct 9, 2024 | Trail of Kata Ct | Algal mat alert sign | Updates from routine monitoring program-organization |
| Sep 6, 2024 | Trail of Kata Ct | Algal mat alert sign | Updates from routine monitoring program-organization |
| Sep 6, 2024 | Trail of Kata Ct | Algal mat alert sign | Updates from routine monitoring program-organization |
| Aug 23, 2024 | Trail of Kata Ct | Algal mat alert sign | Updates from routine monitoring program-organization |
| Aug 1, 2024 | Trail of Kata Ct | Algal mat general awareness sign | Bottom/benthic bloom observed; Testing results below posting triggers |
| Aug 1, 2024 | Trail of Kata Ct | Algal mat general awareness sign | Bottom/benthic bloom observed; Testing results below posting triggers |
| Jul 31, 2024 | Elks Club | None | Advisory based on visual and toxins |
| Jul 25, 2024 | Tahoe Keys Marina/Sailing Lagoon | NA - refer to Report Details | Under investigation |
| Aug 29, 2023 | Tahoe Keys Marina/Sailing Lagoon | None | Testing results below posting triggers |
| Aug 14, 2023 | Tahoe Keys Marina/Sailing Lagoon | Visual observation | Under investigation |
| Sep 29, 2020 | Upper Truckee River, downstream of STPUD station | Caution | Bottom/benthic bloom observed |
| Sep 29, 2020 | Upper Truckee River | Caution | 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.