Leslie Creek: toxic algae advisories

Leslie Creek, San Mateo County. See all San Mateo County waters.

What the state's records say

Caution advisory, last posted Nov 8, 2024. 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 Leslie Creek

The state has an advisory on file for Leslie Creek (Caution advisory), last posted Nov 8, 2024, 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:

Each reported spot at Leslie Creek and its latest status
Spot	Status
At Kehoe Ave upstream of lagoon	Caution advisory, last posted Nov 8, 2024. No all-clear recorded.
At Delaware St San Mateo	Caution advisory, last posted Nov 8, 2024. No all-clear recorded.

Advisory history

Every advisory record the state has published for Leslie Creek, newest first. "None" is the state's record that no advisory was recommended on that date. "NA" records do not change a status.

Advisory records for Leslie Creek, newest first
Date	Spot	State's level	Notes
Nov 8, 2024	At Kehoe Ave upstream of lagoon	Caution	Alert-detached mats observed
Nov 8, 2024	At Kehoe Ave upstream of lagoon	Caution	Marine bloom present (red tide)
Nov 8, 2024	At Delaware St San Mateo	Caution	Marine bloom present (red tide)

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.