By Michael Lanza
Standing on the rocky bank of Idaho’s Middle Fork of the Salmon River, deep within the second-largest U.S. wilderness outside Alaska, my 14-year-old son, Nate, and I look down at the foaming, frothing, spitting energy of Marble Rapid—the first big whitewater of our six-day rafting and kayaking trip down one of the world’s premier wilderness rivers. One of our guides, Matt Leidecker, points to the rapid’s entrance, where the river makes a hard, 90-degree right turn at a “hole,” a depression where the roaring current recirculates powerfully enough to toss a person in a kayak around like a bathtub toy. “I’ve seen that hole keep kayaks,” he warns us.