Oregon
Toxic algae in Linn County lakes
2 lakes and waterways in Linn County have harmful algal bloom reports in Oregon's official data. The most recent entry is for Detroit Lake: Oregon's archive has no advisory for Detroit Lake in 2025. The last was a health advisory in 2024. Detroit Lake has 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.
- North Santiam River 2024
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.