Blue-green Algae in Oregon
16 confirmed blue-green algae reports in Oregon, 1 still active. About this disease: symptoms and prevention.
16
Reports on record
1
Currently active
0
Last 7 days
1
Last 30 days
Where in the state
3
2
2
2
1
1
1
1
1
1
Recent reports
Blue-green Algae
Active · Aug 28, 2026
Waldport
Eckman Lake, east of Waldport; OHA recreational use health advisory, cyanotoxins above guideline values
Source ↗Blue-green Algae
Historical · Aug 6, 2026
Eugene, Lane County
Fern Ridge Reservoir (OHA Precaution, above dog guideline)
Source ↗Blue-green Algae
Historical · Aug 6, 2026
Lincoln City, Lincoln County
Devils Lake (OHA Precaution)
Source ↗Blue-green Algae
Historical · Jul 27, 2026
Prineville, Crook County
Prineville Reservoir (OHA Advisory)
Source ↗Blue-green Algae
Historical · Jul 23, 2026
Gladstone, Clackamas County
Clackamas Cove (OHA Precaution)
Source ↗Blue-green Algae
Historical · Jul 21, 2026
Portland, Multnomah County
Willamette River, Portland stretch (OHA Precaution)
Source ↗Blue-green Algae
Historical · Jul 20, 2026
Oxbow, Baker County
Hells Canyon Reservoir (OHA Advisory)
Source ↗Blue-green Algae
Historical · Jul 20, 2026
Lowell, Lane County
Dexter Reservoir (OHA Precaution)
Source ↗Blue-green Algae
Historical · Jul 20, 2026
Richland, Baker County
Brownlee Reservoir (OHA Advisory)
Source ↗Blue-green Algae
Historical · Jul 8, 2026
Florence, Lane County
Siltcoos Lake (OHA Precaution, above dog guideline)
Source ↗Blue-green Algae
Historical · Jul 2, 2026
North Powder, Union County
Thief Valley Reservoir (OHA Advisory)
Source ↗