McLeod Lake: toxic algae advisories
McLeod Lake, San Joaquin County. See all San Joaquin County waters.
What the state's records say
Danger advisory, last posted Jul 9, 2021. No all-clear recorded.
3 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: Toxins may be at levels that can seriously harm people and animals. Stay out of the water and keep children and pets away from the water and the shore.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at McLeod Lake
The state has an advisory on file for McLeod Lake (Danger advisory), last posted Jul 9, 2021, 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 |
|---|---|
| Morelli Park (MP) | The state's latest record, from Oct 1, 2026, recommends no advisory. |
| by Joan Darrah Promenade (ML) | The state's latest record, from Sep 2, 2026, recommends no advisory. |
| Stockton waterfront; McLeod Lake | Danger advisory, last posted Jul 9, 2021. No all-clear recorded. |
| Morelli Park Boat Launch | Danger advisory, last posted Sep 4, 2020. No all-clear recorded. |
| Stockton Downtown Marina | Danger advisory, last posted Aug 25, 2020. No all-clear recorded. |
Advisory history
Every advisory record the state has published for McLeod 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 |
|---|---|---|---|
| Oct 1, 2026 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 2, 2026 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 2, 2026 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 30, 2026 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 30, 2026 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 2, 2026 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 2, 2026 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 11, 2026 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 11, 2026 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 20, 2026 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 20, 2026 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 2, 2025 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 2, 2025 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Oct 2, 2025 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 3, 2025 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 3, 2025 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 7, 2025 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Aug 7, 2025 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 24, 2025 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 24, 2025 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 2, 2025 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| Jul 2, 2025 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 2, 2025 | by Joan Darrah Promenade (ML) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jun 5, 2025 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 5, 2025 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 25, 2024 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 25, 2024 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 23, 2024 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 23, 2024 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 26, 2024 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 26, 2024 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 20, 2024 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 20, 2024 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 16, 2024 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 16, 2024 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 16, 2024 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 29, 2023 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 29, 2023 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Sep 29, 2023 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 24, 2023 | by Joan Darrah Promenade (ML) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 24, 2023 | Morelli Park (MP) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 21, 2023 | Morelli Park (MP) | None | Updates from routine monitoring program-organization |
| Jul 21, 2023 | by Joan Darrah Promenade (ML) | None | Updates from routine monitoring program-organization |
| Jun 16, 2023 | by Joan Darrah Promenade (ML) | None | Updates from routine monitoring program-organization |
| Jun 16, 2023 | Morelli Park (MP) | None | Updates from routine monitoring program-organization |
| Jun 16, 2023 | by Joan Darrah Promenade (ML) | Caution | Updates from routine monitoring program-organization |
| May 26, 2023 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| May 26, 2023 | by Joan Darrah Promenade (ML) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Nov 14, 2022 | by Joan Darrah Promenade (ML) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Nov 14, 2022 | Morelli Park (MP) | None | No cyano bloom w/testing |
| Sep 27, 2022 | Morelli Park (MP) | Caution | Floating/planktonic bloom observed; Updates from routine monitoring program-organization |
| Sep 27, 2022 | by Joan Darrah Promenade (ML) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 16, 2022 | by Joan Darrah Promenade (ML) | Warning | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 16, 2022 | Morelli Park (MP) | Caution | Floating/planktonic bloom observed; Updates from routine monitoring program-organization |
| Sep 13, 2022 | by Joan Darrah Promenade (ML) | Warning | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Sep 13, 2022 | Morelli Park (MP) | Caution | Floating/planktonic bloom observed; Updates from routine monitoring program-organization |
| Sep 2, 2022 | by Joan Darrah Promenade (ML) | Warning | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 26, 2022 | by Joan Darrah Promenade (ML) | Warning | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 26, 2022 | Morelli Park (MP) | Caution | Floating/planktonic bloom observed; Updates from routine monitoring program-organization |
| Aug 24, 2022 | by Joan Darrah Promenade (ML) | Warning | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 24, 2022 | Morelli Park (MP) | Caution | Floating/planktonic bloom observed; Updates from routine monitoring program-organization |
| Aug 17, 2022 | by Joan Darrah Promenade (ML) | Warning | Updates from routine monitoring program-organization |
| Aug 17, 2022 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| Aug 9, 2022 | by Joan Darrah Promenade (ML) | Warning | Updates from routine monitoring program-organization |
| Aug 9, 2022 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| Jul 29, 2022 | by Joan Darrah Promenade (ML) | Caution | Updates from routine monitoring program-organization |
| Jul 29, 2022 | by Joan Darrah Promenade (ML) | Caution | visual monitoring based advisory |
| Jul 29, 2022 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| Jul 25, 2022 | by Joan Darrah Promenade (ML) | Caution | |
| Jul 25, 2022 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| Jul 15, 2022 | by Joan Darrah Promenade (ML) | Warning | |
| Jul 15, 2022 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| Jul 12, 2022 | by Joan Darrah Promenade (ML) | Caution | |
| Jul 12, 2022 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| Jul 12, 2022 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| Jul 1, 2022 | by Joan Darrah Promenade (ML) | Caution | |
| Jul 1, 2022 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| Jun 17, 2022 | by Joan Darrah Promenade (ML) | Caution | |
| Jun 17, 2022 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| Jun 10, 2022 | by Joan Darrah Promenade (ML) | Caution | |
| Jun 10, 2022 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| May 27, 2022 | by Joan Darrah Promenade (ML) | Caution | |
| May 27, 2022 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| May 19, 2022 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| May 19, 2022 | by Joan Darrah Promenade (ML) | Caution | |
| May 12, 2022 | by Joan Darrah Promenade (ML) | Caution | |
| May 12, 2022 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| May 2, 2022 | by Joan Darrah Promenade (ML) | Caution | |
| May 2, 2022 | Morelli Park (MP) | Caution | Updates from routine monitoring program-organization |
| Jul 9, 2021 | Stockton waterfront; McLeod Lake | Danger | Advisory based on visual and toxins |
| Sep 4, 2020 | Morelli Park Boat Launch | Danger | Advisory based on visual and toxins |
| Aug 25, 2020 | Stockton Downtown Marina | Danger | 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.