Summer Island Campground is a small boat-in only campground with 6 campsites located near the confluence of Lake Roosevelt and the Kettle River, accessible only by boat.

The campground features vault toilets and boat docks, making it ideal for boaters seeking solitude, though water level fluctuations require visits in mid to late summer for reliable access.

This remote island location offers a quieter alternative to car-accessible campgrounds, with the possibility of having the entire site to yourself.