Rainbow Bay offers a free day-use picnic area on Georgetown Lake with a car-top only boat launch, making it ideal for anglers and paddlers with smaller watercraft.

The site features picnic tables and restrooms, though there is no potable water or garbage service, so visitors should pack out what they pack in.

Open seasonally from mid-May through late September (weather dependent), it's located about 14 miles south of Philipsburg off Montana Highway 1.