The Billings Gazette reports that U.S. District Judge Brian Morris has ruled that the U.S. Army Corps of Engineers failed to do adequate environmental study before moving ahead with a planned $59 million concrete dam across the Yellowstone River.  The project, which was scheduled to start construction this month near Glendive, Montana would replace an existing rock weir diverting irrigation water for area ranches and farms.  Citing concern over the lack of study around a planned bypass for the endangered pallid sturgeon, the judge has ruled that that the government must prove that their plan will provide access to upstream spawning grounds for the ancient fish.  >Read More via http://billingsgazette.com/news/state-and-regional/montana/article_6fc12289-afec-5eb1-b17e-48ca061f29b7.html