North of Ketchum and south of Stanley, this is a great family mountain bike ride (11 mi./1300) that follows an easy going forest service road across the river several times back into the mountains where the world famous Salmon river begins. The entire mountain bike ride is only about 11 miles out and back. To get there go north from Ketchum on Highway 75 to Galena summit. Just on the other side of the summit, right as you come to the bottom, you will come to the road to the headwaters of the Salmon that goes to the left. Pull off on this road and park. You begin riding here. Just head south on this gravel road. In a couple of places the road forks up to the left. You stay on the main road to the right which follows the river. At one point about 3 or so miles into the mountain bike ride you will come to a camp ground. Just stay on what is obviously the main traveled road and you will find your way through the campground. The road keeps on going on the other side of this campground. After about 5.5 miles from the beginning the road starts to head up into a narrow canyon and starts getting a little steep. This is a good place to turn around and make your way back.
Overall, Headwaters of the Salmon is the 27th most popular mountain bike trail of all 63 mountain biking rides in Idaho.