The famous Giant Gap run of the even more famous North Fork American Wild and Scenic River is one of the most challenging runs in Northern California. Cliffs tower 2,000 feet above clear green streams smashing a path through rapids choked with boulders. Heaps of mine tailings and an old cabin ruin border the course of this roller coaster ride through the historic Mother Lode.
Learn more about this BLM-managed river: http://on.doi.gov/IsIKiq
Photo: Bob Wick, BLM
(Source: Flickr / mypubliclands)