The Salmon River, the largest tributary of the Snake River, dominates central Idaho. It drains the eastern, western and northern slopes of the Idaho Batholith, the vast granite pluton in the heart of the state. It’s also the largest un-dammed river in the Lower 48. Exploring all of the Salmon River and its tributaries would take a lifetime or two. But last week WC explored a small part of the Upper Salmon, in Sawtooth National Recreation Area. Here’s a photo notebook from the Sawtooth National Recreation Area, along the upper stretches of the headwaters.