Great Swimming!
...but it can be very busy. The sites are nice and fairly well dispersed with lots of trees and foliage near the water. The park is a common pull out spot for boaters and tubers who run the Blackfoot. There is a lot of summer time traffic of shuttle vehicles on the paved road before the site and the dirt road afterwards. The swimming hole is deep and well defined which is good for swimmers but there is a lot of boat traffic. The cliffs across from the site are great for jumping but check with a local about the correct spot for the highest point. To get the cliffs you have to cross the main channel of the river. If you can't swim across, don't jump because it'll be hard to get into the swimming hole as you come back up. The sites are fairly well shaded and an awesome place to put up you feet (and paddles) after a float.