One round river

So much of the tortured ecological history of the American West has been played out in microcosm along the banks of the Blackfoot River in western Montana. Generations of abuse - from logging, grazing, mining, and now overdevelopment - have left this once vibrant waterway choked and gasping. And today a new threat looms: a massive gold mine hard by the river's edge. Here is the biography of a river, and like the best of that genre, it resonates far beyond the life of its particular central character. In telling the river's story, Richard Manning takes us as far back as the Salish tribe, who…