Chalone Creek: toxic algae advisories
Chalone Creek, San Benito County. See all San Benito County waters.
What the state's records say
The state's latest record, from Apr 9, 2026, 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 Chalone Creek
The state's latest record, from Apr 9, 2026, recommends no advisory. For Chalone Creek, 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 |
|---|---|
| W.F. ~1.2km above Chalone Annex Campground | The state's latest record, from Apr 9, 2026, recommends no advisory. |
Advisory history
Every advisory record the state has published for Chalone Creek, 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 |
|---|---|---|---|
| Apr 9, 2026 | W.F. ~1.2km above Chalone Annex Campground | None |
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.