Blue-green Algae in Montana
7 confirmed blue-green algae reports in Montana, none currently active. About this disease: symptoms and prevention.
7
Reports on record
0
Currently active
0
Last 7 days
0
Last 30 days
Where in the state
2
2
1
1
1
Recent reports
Blue-green Algae
Historical · Jul 21, 2026
West Yellowstone, Gallatin County
Hebgen Lake (Grayling Arm)
Source ↗Blue-green Algae
Historical · Jul 21, 2026
Helena, Lewis and Clark County
Hauser Reservoir (Clark's Bay / Causeway)
Source ↗Blue-green Algae
Historical · Jul 21, 2026
Bozeman, Gallatin County
Elk Grove Pond (Four Corners)
Source ↗Blue-green Algae
Historical · Jun 25, 2026
East Helena, Lewis and Clark County
Lake Helena (Causeway Fishing Access)
Source ↗Blue-green Algae
Historical · Jun 24, 2026
Townsend, Broadwater County
Canyon Ferry Reservoir (Duck Creek Campground)
Source ↗