California
Toxic algae in Del Norte County lakes
7 lakes and waterways in Del Norte County have harmful algal bloom reports in California's official data. The most recent entry is for Klamath River: There are no bloom reports for Klamath River in the last 30 days of California's data. The most recent was a Caution advisory on 26 August 2026 at Campground Sandy Boat Ramp (R-1).
Lakes with bloom history
Newest report first. Each lake has its own page with the full history and what the results mean.
Other waterbodies with a report
These have one or two reports in a single year, which isn't enough history for a page of their own yet.
- Elk Creek 2026
- Illinois River 2026
- Junior Creek 2026
- Pond #1 On Klamath River Overflow Channel 2024
- Smith River 2026
- Waukell Creek 2026
Source: California State Water Resources Control Board, official data, checked 24 October 2026. For today's conditions see the California HABs Portal map. No report doesn't mean a lake is safe: most water is only tested occasionally.