Weekend Oil Spill into Yellowstone River Leaves Montanans Concerned – Questions Asked if Keystone XL Construction Should ContinueWeekend Oil Spill into Yellowstone River Leaves Montanans Concerned – Questions Asked if Keystone XL Construction Should ContinueA pipeline spill into the Yellowstone River over the weekend has triggered responses form conservations groups.Sarah YovetichSarah Yovetich