Montana /
Cooney Reservoir
Reservoir in Montana · 843 acres · near Columbus
Cooney Reservoir has 3 boat ramps listed as public.
Past algal blooms
Harmful algal blooms reported on this water (state reports compiled by U.S. EPA): 2019 to 2021 and 2023 to 2026.
state reports compiled by U.S. EPA · checked October 18, 2026
Launches
- Cooney State Park Boat Ramp · Boat ramp · near Columbus
- Cooney State Park Boat Ramp · Boat ramp · near Columbus
- Cooney State Park Boat Ramp · Boat ramp · near Columbus
Community
Where people who fish, boat and paddle Cooney Reservoir talk about it. Lake associations, clubs and local groups will be added as we find them.