Los Banos Creek Reservoir: toxic algae advisories
Los Banos Creek Reservoir, Merced County. See all Merced County waters.
What the state's records say
The state's latest record, from Jul 21, 2025, recommends no advisory.
Last advisory on file: Jul 14, 2025.
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 Los Banos Creek Reservoir
The state's latest record, from Jul 21, 2025, recommends no advisory. For Los Banos Creek Reservoir, 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 |
|---|---|
| Campground beach | The state's latest record, from Jul 21, 2025, recommends no advisory. |
| Los Banos Creek Boat Launch | The state's latest record, from Jul 21, 2025, recommends no advisory. |
Advisory history
Every advisory record the state has published for Los Banos Creek Reservoir, 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 |
|---|---|---|---|
| Jul 21, 2025 | Campground beach | None | End date recorded: Aug 22, 2022. Updates from routine monitoring program-organization |
| Jul 21, 2025 | Los Banos Creek Boat Launch | None | End date recorded: Nov 18, 2022. Updates from routine monitoring program-organization |
| Jul 14, 2025 | Campground beach | Caution | End date recorded: Aug 22, 2022. Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 14, 2025 | Los Banos Creek Boat Launch | Caution | End date recorded: Nov 18, 2022. Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 7, 2025 | Campground beach | Caution | End date recorded: Aug 22, 2022. Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 7, 2025 | Los Banos Creek Boat Launch | Caution | End date recorded: Nov 18, 2022. Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 1, 2025 | Campground beach | Caution | End date recorded: Aug 22, 2022. Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 1, 2025 | Los Banos Creek Boat Launch | Caution | End date recorded: Nov 18, 2022. Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 23, 2025 | Campground beach | Caution | End date recorded: Aug 22, 2022. Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 23, 2025 | Campground beach | Caution | End date recorded: Aug 22, 2022. Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 23, 2025 | Los Banos Creek Boat Launch | Caution | End date recorded: Nov 18, 2022. Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 12, 2025 | Campground beach | Caution | End date recorded: Aug 22, 2022. Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 12, 2025 | Los Banos Creek Boat Launch | Caution | End date recorded: Nov 18, 2022. Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 6, 2025 | Campground beach | Caution | End date recorded: Aug 22, 2022. Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 6, 2025 | Los Banos Creek Boat Launch | Caution | End date recorded: Nov 18, 2022. Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 2, 2025 | Campground beach | None | End date recorded: Aug 22, 2022. Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 2, 2025 | Los Banos Creek Boat Launch | None | End date recorded: Nov 18, 2022. Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 28, 2025 | Campground beach | None | End date recorded: Aug 22, 2022. Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 28, 2025 | Los Banos Creek Boat Launch | None | End date recorded: Nov 18, 2022. Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 9, 2025 | Campground beach | None | End date recorded: Aug 22, 2022. Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 9, 2025 | Los Banos Creek Boat Launch | None | End date recorded: Nov 18, 2022. Testing results below posting triggers; Updates from routine monitoring program-organization |
| Apr 28, 2025 | Los Banos Creek Boat Launch | None | End date recorded: Nov 18, 2022. Testing results below posting triggers |
| Apr 28, 2025 | Campground beach | None | End date recorded: Aug 22, 2022. Testing results below posting triggers |
| Oct 18, 2022 | Los Banos Creek Boat Launch | General awareness | End date recorded: Nov 18, 2022. Rec general awareness |
| Oct 18, 2022 | Campground beach | General awareness | End date recorded: Aug 22, 2022. Rec general awareness |
| Oct 18, 2022 | Campground beach | Caution | Updates from routine monitoring program-organization |
| Oct 18, 2022 | Los Banos Creek Boat Launch | Caution | No cyano, other algae present. |
| Aug 1, 2022 | Los Banos Creek Boat Launch | None | No cyano, other algae present. |
| Jul 22, 2022 | Campground beach | Algal mat alert sign | Bottom/benthic bloom observed |
| Jul 21, 2022 | Los Banos Creek Boat Launch | Caution | Suspected illness reported |
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.