Kelly Lake: toxic algae advisories
Kelly Lake, Santa Cruz County. See all Santa Cruz County waters.
What the state's records say
Caution advisory, last posted Sep 29, 2026. No all-clear recorded.
2 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 Kelly Lake
The state has an advisory on file for Kelly Lake (Caution advisory), last posted Sep 29, 2026, 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 |
|---|---|
| Watsonville | Caution advisory, last posted Sep 29, 2026. No all-clear recorded. |
| Kelly Lake | Caution advisory, last posted Jul 15, 2016. No all-clear recorded. |
Advisory history
Every advisory record the state has published for Kelly 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 29, 2026 | Watsonville | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 11, 2026 | Watsonville | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 12, 2026 | Watsonville | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 5, 2026 | Watsonville | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 30, 2026 | Watsonville | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 1, 2026 | Watsonville | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jul 1, 2026 | Watsonville | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 18, 2026 | Watsonville | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 12, 2026 | Watsonville | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Jun 4, 2026 | Watsonville | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| May 21, 2026 | Watsonville | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| May 15, 2026 | Watsonville | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 26, 2025 | Watsonville | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 18, 2025 | Watsonville | Caution | Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 14, 2025 | Watsonville | Warning | Lake-wide advisory; Updates from routine monitoring program-organization |
| Nov 5, 2025 | Watsonville | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 29, 2025 | Watsonville | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 21, 2025 | Watsonville | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 15, 2025 | Watsonville | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 8, 2025 | Watsonville | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 1, 2025 | Watsonville | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 24, 2025 | Watsonville | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 16, 2025 | Watsonville | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 11, 2025 | Watsonville | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 11, 2025 | Watsonville | Danger | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 11, 2025 | Watsonville | Danger | Updates from routine monitoring program-organization |
| Sep 4, 2025 | Watsonville | Danger | Updates from routine monitoring program-organization |
| Aug 27, 2025 | Watsonville | Danger | Updates from routine monitoring program-organization |
| Aug 20, 2025 | Watsonville | Danger | Updates from routine monitoring program-organization |
| Aug 14, 2025 | Watsonville | Danger | Updates from routine monitoring program-organization |
| Aug 7, 2025 | Watsonville | Caution | Updates from routine monitoring program-organization |
| Jul 31, 2025 | Watsonville | Caution | Updates from routine monitoring program-organization |
| Jul 24, 2025 | Watsonville | None | Updates from routine monitoring program-organization |
| Jul 9, 2025 | Watsonville | Caution | Updates from routine monitoring program-organization |
| Jun 26, 2025 | Watsonville | Caution | Updates from routine monitoring program-organization |
| Jun 12, 2025 | Watsonville | Caution | Updates from routine monitoring program-organization |
| May 29, 2025 | Watsonville | Caution | Updates from routine monitoring program-organization |
| Jul 15, 2016 | Kelly Lake | Caution |
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.