Associated Press: Bridgers Poplar pipeline carries oil from the Bakken region of Montana and North Dakota. The damaged section was installed in 1967, in an 8-foot-deep trench dug into the river bottom, according to documents submitted to regulators. A closer examination of the damaged section could help explain why it failed. It will tell you whether or not there were any defects in the metal, or was it exposed and hit by something, Salvin said. Officials are investigating whether high waters or an ice jam on...