"Bert Loper was born in 1869 the very day that Major John Wesley Powell discovered the confluence of the San Juan and Colorado Rivers. Loper spent much of his life devoted to those two streams. But it was never easy. Orphaned and abused, Loper worked most of his life at the very bottom, the nameless grunt in hard rock mines, the sore-backed shoveler on a placer bar, the subsistence rancher on a lonely gravel delta in Glen Canyon. Whatever Loper got,...