Grass Valley Lake: toxic algae advisories
Grass Valley Lake, San Bernardino County. See all San Bernardino County waters.
What the state's records say
The state's latest record, from Sep 2, 2022, 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 Grass Valley Lake
The state's latest record, from Sep 2, 2022, recommends no advisory. For Grass Valley Lake, 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 |
|---|---|
| South West Cove | The state's latest record, from Sep 2, 2022, recommends no advisory. |
Advisory history
Every advisory record the state has published for Grass Valley Lake, 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 |
|---|---|---|---|
| Sep 2, 2022 | South West Cove | None | End date recorded: Dec 27, 2022. No cyano bloom w/testing |
| Sep 2, 2022 | South West Cove | None | No cyano bloom w/testing |
| Sep 2, 2022 | South West Cove | None | No cyano bloom w/testing |
| Jun 30, 2022 | South West Cove | 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.