Seven Devils Loop is a 27 mile lightly trafficked loop trail located near Riggins, Idaho that features a lake and is only recommended for very experienced adventurers. The trail is primarily used for hiking, walking, camping, and backpacking and is accessible from July until September.
I've hiked this loop numerous times and have always found it to be an outstanding wilderness trip. Of course, you can hike the loop in either direction but I would recommend counter-clockwise. You will want to deviate from the loop and locate your campsites at the many lakes which are located on trails which head toward the main crest. Sheep, Echo and Baldy are among my favorites. You will add to the mileage by camping off the loop, but you will also find much more scenic and enjoyable camps. The east side of the range is much drier than the west with fewer camping areas. Experienced hikers can complete this loop as an overnight, but to savor the experience, I would recommend 3-4 days at least.
The access road which is 17 miles long leaves Highway 95 south of Riggins. It is primarily dirt and/or gravel and gets a little rough near the end; best for higher clearance vehicles. There are two campgrounds near the trail head.