HELENA – NorthWestern Energy is calling its proposed $900 million purchase of 11 hydroelectric dams in Montana a “once-in-a-lifetime” chance — but the company worked many months to make it ...

Mystic Lake Dam on West Rosebud Creek; and Hauser, Holter, Black Eagle, Rainbow, Cochrane, Ryan and Morony dams on the Missouri River. "The dams that are so much a part of Montana's environment ...

"That dam was designed to be built on solid rock bottoms," said Jim Shive, who serves as a historical consultant for PPL Montana, which owns the existing Hauser Dam. "(Hauser) wanted something up ...