West Fork Carson River: toxic algae advisories
West Fork Carson River, Alpine County. See all Alpine County waters.
What the state's records say
The state's latest record, from Oct 15, 2025, recommends no advisory.
That reflects what the state knew on that date. It is not a finding that the water is safe now: blooms can return within days, and many are never reported.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at West Fork Carson River
The state's latest record, from Oct 15, 2025, recommends no advisory. For West Fork Carson River, that is not the same as an all-clear for today. Look at the water before your dog goes in: keep it out of green, blue-green or scummy water and away from mats on the shore.
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 |
|---|---|
| Series of 3 BDA’s in Faith Valley | The state's latest record, from Oct 15, 2025, recommends no advisory. |
| West Fork Carson River, upper Faith | The state's latest record, from Oct 11, 2023, recommends no advisory. |
| West Fork Carson River at Paynesville Bridge | The state's latest record, from Oct 3, 2023, recommends no advisory. |
Advisory history
Every advisory record the state has published for West Fork Carson 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 15, 2025 | Series of 3 BDA’s in Faith Valley | None | Testing results below posting triggers |
| Oct 10, 2025 | Series of 3 BDA’s in Faith Valley | NA - refer to Report Details | Suspected bloom, investigation ongoing |
| Oct 11, 2023 | West Fork Carson River, upper Faith | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 3, 2023 | West Fork Carson River at Paynesville Bridge | None | Advisory based on visual and toxins |
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.