Idaho /
Island Park Reservoir
Reservoir in Idaho · 7,559 acres · near Island Park
Island Park Reservoir has 6 boat ramps listed as public.
Algal bloom health advisory
Idaho Department of Health and Welfare has a cyanobacteria health advisory for this water (updated October 2, 2026). Avoid contact with discoloured water or scum, and keep pets and children out of it.
Idaho Department of Health and Welfare · checked October 18, 2026
Past algal blooms
Harmful algal blooms reported on this water (state reports compiled by U.S. EPA): 2016, 2021, 2023 and 2026.
state reports compiled by U.S. EPA · checked October 18, 2026
Launches
- Buttermilk · Boat ramp · near Island Park
- Island Park · Boat ramp · near Island Park
- Island Park Boat Ramp · Boat ramp · near Island Park · free
- McCrea · Boat ramp · near Island Park
- Mill Creek · Boat ramp · near Island Park · free
- West End · Boat ramp · near Island Park · free
Community
Where people who fish, boat and paddle Island Park Reservoir talk about it. Lake associations, clubs and local groups will be added as we find them.