The Old Mill Dome — formerly South Sawmill Lodge & Reunion Center — is a large family and group vacation lodge in Island Park, Idaho. The facility has ten bedrooms, two bunk rooms with twenty total beds, a large surround-sound theater, a circular loft with zipline, a huge gathering area downstairs, a large kitchen, four bathrooms, and two children play areas under the staircases.
The dome is 90-feet (27.4 m) diameter by 20-feet (6.1 m) tall on a 20-foot (6.1 m) stem wall. The stem wall was formed with wood boards and sprayed in place with shotcrete on one side, then the boards are removed giving the exterior a wood-like appearance, but it is actually concrete. The Old Mill Dome encompasses 6,360 square feet (590 m²) on the ground floor with another 3,530 square feet (328 m²) on the second — a total of almost 10,000 square feet (920 m²).
The dome is near Island Park Reservoir, Mesa Falls, and an easy drive to Yellowstone National Park. It’s a fantastic place for riding snowmobiles with deep snow every year. Summers are beautiful with cool nights and an expansive view of the night sky with no light pollution.
The South Sawmill Lodge & Reunion Center sold in 2021 and was renamed the Old Mill Dome. The new owners are adding upgrades to the property, including a pickle ball court. It is available for rent.