Matthews Creek campground has 10 campsites located on the South Fork of the Salmon River. There is easy river access available and a number of nice swimming holes nearby the campground.
This is a great Nat Forest campground with a beautiful view of the great creek below. The water is crystal clear (and cold) with a nice pebble beach. Access to the beach is a short walk down fairly steep hill. The outhouse was clean as were all of the sites, with a good firepit and table. There is water available, but a sign warns to boil water before drinking. It is a pretty long drive down basically single lane roads to get to the campground, and you should make sure you have all supplies and no stores/supplies close by.
It may be way out in the middle of BFE but it is worth the drive. Amazing place to swim. The stars at night are so bright. My favorite camping place ever!