Lake Henshaw: toxic algae advisories
Lake Henshaw, San Diego County. See all San Diego County waters.
What the state's records say
Caution advisory, last posted Dec 28, 2022. No all-clear recorded.
7 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: Algae that can make toxins may be present. Keep people, children and pets away from algae and scum, and do not let pets drink the water.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at Lake Henshaw
The state has an advisory on file for Lake Henshaw (Caution advisory), last posted Dec 28, 2022, 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.
Satellite estimate (not an advisory)
Week ending Oct 17, 2026: about 460,000 cells/mL of cyanobacteria near the center of Lake Henshaw.
A satellite estimate from EPA CyAN for a 7.1 km² lake. It does not measure toxins and does not change the advisory status.
| Week ending | Estimate |
|---|---|
| Oct 17, 2026 | about 460,000 cells/mL |
| Oct 10, 2026 | about 650,000 cells/mL |
| Sep 6, 2025 | about 2,100,000 cells/mL |
| Aug 30, 2025 | about 2,000,000 cells/mL |
| Sep 14, 2024 | about 220,000 cells/mL |
| Jun 15, 2024 | about 2,100,000 cells/mL |
| Jun 8, 2024 | about 2,100,000 cells/mL |
| Jun 1, 2024 | about 1,000,000 cells/mL |
This is a satellite estimate from the U.S. EPA's Cyanobacteria Assessment Network, not an advisory. It estimates how much cyanobacteria is in the water near the lake's center, not whether toxins are present: a high number does not mean toxins, and a low one does not mean there are none. It covers lakes of about 1 square kilometer and larger, so small ponds, dog parks and most rivers are not covered, and clouds can hide a lake for weeks. It never changes the advisory status above.
Satellite estimates: U.S. EPA Cyanobacteria Assessment Network (CyAN), from Copernicus Sentinel-3 data. Provisional, research-level estimates; EPA does not endorse this site. Checked Oct 22, 2026.
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 |
|---|---|
| Open water near buoy line and at shoreline | The state's latest record, from Sep 23, 2026, recommends no advisory. |
| end of fishing dock | The state's latest record, from Sep 23, 2026, recommends no advisory. |
| Open water near buoy line and at shoreline | The state recorded an end date of Dec 30, 2022. |
| end of fishing dock | Caution advisory, last posted Dec 28, 2022. No all-clear recorded. |
| Launch Ramp | Caution advisory, last posted Jun 30, 2022. No all-clear recorded. |
| end of fishing dock | Caution advisory, last posted Jul 21, 2021. No all-clear recorded. |
| Spot not described | Caution advisory, last posted Jul 21, 2021. No all-clear recorded. |
| Lake Henshaw | Caution advisory, last posted Apr 9, 2021. No all-clear recorded. |
| Lake Henshaw, South shore | Caution advisory, last posted Dec 31, 2020. No all-clear recorded. |
| Lake Henshaw, near fishing dock | Caution advisory, last posted Dec 31, 2020. No all-clear recorded. |
Advisory history
Every advisory record the state has published for Lake Henshaw, 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 23, 2026 | Open water near buoy line and at shoreline | None | Updates from routine monitoring program-organization |
| Sep 23, 2026 | end of fishing dock | None | Updates from routine monitoring program-organization |
| Sep 18, 2026 | end of fishing dock | None | Updates from routine monitoring program-organization |
| Sep 18, 2026 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Sep 14, 2026 | Open water near buoy line and at shoreline | None | Updates from routine monitoring program-organization |
| Sep 14, 2026 | end of fishing dock | None | Updates from routine monitoring program-organization |
| Sep 2, 2026 | end of fishing dock | None | Updates from routine monitoring program-organization |
| Sep 2, 2026 | Open water near buoy line and at shoreline | None | Updates from routine monitoring program-organization |
| Aug 21, 2026 | Open water near buoy line and at shoreline | None | Updates from routine monitoring program-organization |
| Aug 21, 2026 | end of fishing dock | None | Updates from routine monitoring program-organization |
| Aug 13, 2026 | end of fishing dock | None | Updates from routine monitoring program-organization |
| Aug 13, 2026 | Open water near buoy line and at shoreline | None | Updates from routine monitoring program-organization |
| Aug 13, 2026 | end of fishing dock | None | Updates from routine monitoring program-organization |
| Aug 7, 2026 | end of fishing dock | None | Updates from routine monitoring program-organization |
| Aug 7, 2026 | Open water near buoy line and at shoreline | None | Updates from routine monitoring program-organization |
| Jul 22, 2026 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 22, 2026 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jun 26, 2026 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jun 26, 2026 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 9, 2026 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 9, 2026 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jun 9, 2026 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jun 9, 2026 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 3, 2026 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 3, 2026 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| May 15, 2026 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| May 15, 2026 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| May 15, 2026 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| May 15, 2026 | Open water near buoy line and at shoreline | None | Updates from routine monitoring program-organization |
| May 15, 2026 | end of fishing dock | None | Updates from routine monitoring program-organization |
| May 8, 2026 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| May 8, 2026 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| May 8, 2026 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| May 8, 2026 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| May 5, 2026 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Apr 10, 2026 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Apr 10, 2026 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Apr 10, 2026 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Mar 30, 2026 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Mar 30, 2026 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 17, 2026 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 17, 2026 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Feb 18, 2026 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Dec 22, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Dec 22, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Nov 4, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Nov 4, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Nov 4, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Sep 26, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Sep 26, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Sep 25, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Sep 25, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Sep 12, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Sep 12, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Sep 8, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Sep 8, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Aug 22, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Aug 22, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Aug 22, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Aug 15, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Aug 15, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Aug 8, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Aug 8, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Aug 7, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Aug 7, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Aug 7, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 25, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 25, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 18, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 18, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 18, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 18, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 18, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 11, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 11, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 11, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 11, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 11, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 3, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 3, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 1, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 1, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 1, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 23, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 23, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jun 13, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jun 13, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 10, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 2, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 2, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jun 2, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| May 23, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| May 23, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| May 23, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| May 16, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| May 16, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| May 9, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| May 9, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| May 5, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| May 5, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Apr 29, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Apr 29, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Apr 18, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Apr 18, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Apr 18, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Apr 18, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Apr 11, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Apr 11, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Apr 4, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Apr 4, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 28, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 28, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Mar 18, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Mar 18, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Feb 28, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Feb 28, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Feb 14, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Feb 14, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Feb 7, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Feb 7, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jan 31, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jan 31, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jan 27, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jan 27, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jan 17, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jan 17, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jan 13, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jan 13, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jan 8, 2025 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jan 8, 2025 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Dec 30, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Dec 30, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Dec 30, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Dec 30, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Dec 20, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Dec 20, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Dec 6, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Dec 6, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Nov 22, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Nov 22, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Nov 22, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Nov 22, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Nov 8, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Nov 8, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Nov 4, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Nov 4, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Oct 25, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Oct 25, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Oct 18, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Oct 18, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Oct 9, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Oct 9, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Oct 4, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Oct 4, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Oct 1, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Oct 1, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Oct 1, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Sep 24, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Sep 24, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Sep 17, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Sep 17, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Sep 9, 2024 | end of fishing dock | None | Updates from routine monitoring program-organization |
| Sep 9, 2024 | Open water near buoy line and at shoreline | None | Updates from routine monitoring program-organization |
| Aug 30, 2024 | end of fishing dock | None | Updates from routine monitoring program-organization |
| Aug 30, 2024 | end of fishing dock | None | Updates from routine monitoring program-organization |
| Aug 30, 2024 | Open water near buoy line and at shoreline | None | Updates from routine monitoring program-organization |
| Aug 26, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Aug 26, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Aug 16, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Aug 16, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Aug 8, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Aug 8, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Aug 2, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Aug 2, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 26, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 26, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 26, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 22, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 22, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 15, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 15, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 3, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 3, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 3, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 1, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 1, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 24, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 24, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jun 19, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jun 19, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 7, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jun 7, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jun 7, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 7, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 4, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 4, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| May 24, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| May 24, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| May 20, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| May 20, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| May 10, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| May 10, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| May 3, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| May 3, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Apr 26, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Apr 26, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Apr 24, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Apr 24, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Apr 10, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Apr 10, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 29, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 29, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Mar 22, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 22, 2024 | Open water near buoy line and at shoreline | None | Updates from routine monitoring program-organization |
| Mar 22, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 15, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Mar 15, 2024 | end of fishing dock | None | Updates from routine monitoring program-organization |
| Mar 15, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 15, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Mar 11, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Mar 11, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 1, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 1, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 1, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Feb 16, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Feb 16, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jan 19, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jan 19, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jan 12, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jan 12, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jan 12, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jan 9, 2024 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jan 9, 2024 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Dec 21, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Dec 21, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Dec 15, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Dec 15, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Dec 11, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Dec 5, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Dec 5, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Dec 5, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Nov 20, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Nov 20, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Nov 20, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Nov 20, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Nov 6, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Nov 6, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Oct 30, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Oct 30, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Oct 16, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Oct 16, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Oct 6, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Oct 6, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Oct 2, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Oct 2, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Sep 25, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Sep 25, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Sep 25, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Sep 25, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Sep 11, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Sep 11, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Aug 29, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Aug 29, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Aug 11, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Aug 11, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Aug 9, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Aug 9, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Aug 9, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 21, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 21, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 17, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 17, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 13, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jul 13, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jul 5, 2023 | Open water near buoy line and at shoreline | Warning | Updates from routine monitoring program-organization |
| Jul 5, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jun 23, 2023 | end of fishing dock | Warning | Updates from routine monitoring program-organization |
| Jun 23, 2023 | Open water near buoy line and at shoreline | Warning | Updates from routine monitoring program-organization |
| Jun 20, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jun 20, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jun 8, 2023 | end of fishing dock | Warning | Updates from routine monitoring program-organization |
| Jun 8, 2023 | Open water near buoy line and at shoreline | Warning | Updates from routine monitoring program-organization |
| May 17, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| May 17, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| May 9, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| May 9, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Apr 24, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Apr 24, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Apr 18, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Apr 18, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Apr 10, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Apr 10, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Mar 30, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Mar 30, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 27, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 27, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Mar 17, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Mar 17, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 10, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Mar 10, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Mar 7, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Mar 7, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Feb 27, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Feb 27, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Feb 17, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Feb 17, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Feb 3, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Feb 3, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jan 30, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jan 30, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jan 20, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Jan 20, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jan 17, 2023 | end of fishing dock | Caution | Updates from routine monitoring program-organization |
| Jan 17, 2023 | Open water near buoy line and at shoreline | Caution | Updates from routine monitoring program-organization |
| Dec 28, 2022 | Open water near buoy line and at shoreline | Caution | End date recorded: Dec 30, 2022. Advisory based on visual and toxins |
| Dec 28, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Dec 28, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Dec 19, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Dec 19, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Dec 9, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Dec 9, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Dec 5, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Dec 5, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Nov 18, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Nov 18, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Nov 14, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Nov 14, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Nov 4, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Nov 4, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Nov 1, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Nov 1, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Oct 21, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Oct 21, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Oct 18, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Oct 18, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Oct 10, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Oct 10, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Oct 3, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Oct 3, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Sep 23, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Sep 23, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Sep 23, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Sep 16, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Sep 16, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Sep 15, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Sep 15, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Sep 2, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Sep 2, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Aug 23, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Aug 23, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Aug 8, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Aug 8, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Aug 1, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Aug 1, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Jul 26, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Jul 26, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Jul 14, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Jul 14, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Jul 14, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Jul 11, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Jul 11, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Jun 30, 2022 | Launch Ramp | Caution | Floating/planktonic bloom observed |
| Jun 29, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Jun 29, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Jun 20, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Jun 20, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Jun 17, 2022 | Open water near buoy line and at shoreline | None | Advisory based on visual and toxins |
| Jun 17, 2022 | end of fishing dock | None | Advisory based on visual and toxins |
| Jun 8, 2022 | Open water near buoy line and at shoreline | None | Advisory based on visual and toxins |
| Jun 8, 2022 | end of fishing dock | None | Advisory based on visual and toxins |
| Jun 6, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| Jun 6, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| May 31, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| May 31, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| May 25, 2022 | Open water near buoy line and at shoreline | None | Advisory based on visual and toxins |
| May 25, 2022 | end of fishing dock | None | Advisory based on visual and toxins |
| May 24, 2022 | Open water near buoy line and at shoreline | None | Advisory based on visual and toxins |
| May 24, 2022 | end of fishing dock | None | Advisory based on visual and toxins |
| May 21, 2022 | Open water near buoy line and at shoreline | None | Advisory based on visual and toxins |
| May 21, 2022 | end of fishing dock | None | Advisory based on visual and toxins |
| May 17, 2022 | end of fishing dock | None | Advisory based on visual and toxins |
| May 13, 2022 | Open water near buoy line and at shoreline | None | Advisory based on visual and toxins |
| May 13, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| May 6, 2022 | Open water near buoy line and at shoreline | Caution | Advisory based on visual and toxins |
| May 6, 2022 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Jul 21, 2021 | end of fishing dock | Caution | Advisory based on visual and toxins |
| Jul 21, 2021 | Spot not described | Caution | Advisory based on visual and toxins |
| Apr 9, 2021 | Lake Henshaw | Caution | Advisory based on visual and toxins |
| Dec 31, 2020 | Lake Henshaw, South shore | Caution | Advisory based on visual and toxins |
| Dec 31, 2020 | Lake Henshaw, near fishing dock | Caution | 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.