Oregon
Toxic algae in Lane County lakes
8 lakes and waterways in Lane County have harmful algal bloom reports in Oregon's official data. The most recent entry is for Fern Ridge Reservoir: Oregon issued a health advisory for Fern Ridge Reservoir in 2025, listed on 24 June 2025. Fern Ridge Reservoir, Dorena Reservoir and Walterville Pond and 1 more have had blooms in three or more years.
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.
- Blue River Reservoir 2010
- Cougar Reservoir 2011
- Fall Creek Reservoir 2011
- Golden Gardens Pond 2010
Source: Oregon Health Authority (OHA), official data, checked 24 October 2026. For today's conditions see the OHA current advisories page. No report doesn't mean a lake is safe: most water is only tested occasionally.