The 670 miles of the Yellowstone River cross a varied landscape and face an equal variety of problems along the way.
Landowner opposition helped shoot down President Clinton's Heritage Rivers Initiative, which Yellowstone River activists believe could have helped the river greatly.
The unregulated development of private property along the banks of the Yellowstone River is the greatest threat to the river.
Andrew Dana, who went to the Army Corps of Engineers for a permit to stabilize the Yellowstone River's banks on his land, describes the permitting process as "a bad dream."
The Yellowstone River is the longest undammed river in the West, but Montana's rapid growth is affecting it, as property owners afraid of floods lay huge amounts of riprap along its banks.
Oregon Gov. John Kitzhaber becomes the first major political figure in the Northwest to back breaching of four Snake River dams to help endangered salmon.
The Glen Canyon Action Network plans a Restoration Celebration and Rendezvous at Utah's Glen Canyon Dam.
Both sides are surprised when dam-breaching supporters outnumber opponents at public meetings over breaching four Snake River dams to save salmon.
Michael Collier's new book, "Water, Earth and Sky: The Colorado River Basin," combines his beautiful aerial photos of a remarkable landscape with well-chosen words.