Pacific Ocean: toxic algae advisories

Pacific Ocean, Del Norte County. See all Del Norte County waters.

What the state's records say

Caution advisory, last posted Mar 9, 2026. 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 Pacific Ocean

The state has an advisory on file for Pacific Ocean (Caution advisory), last posted Mar 9, 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:

Each reported spot at Pacific Ocean and its latest status
Spot	Status
Crescent City Harbor	Caution advisory, last posted Mar 9, 2026. No all-clear recorded.
unknown location near California/Oregon border	Reports on file, with no advisory level the state has classified.

Advisory history

Every advisory record the state has published for Pacific Ocean, 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 Pacific Ocean, newest first
Date	Spot	State's level	Notes
Mar 9, 2026	Crescent City Harbor	Caution	Suspected bloom, investigation ongoing; Under investigation
Aug 21, 2024	unknown location near California/Oregon border	NA - refer to Report Details	Marine bloom present (red tide)
Aug 21, 2024	unknown location near California/Oregon border	NA - refer to Report Details	End date recorded: Aug 21, 2024. 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.