They were operated jointly by NorthWestern Energy and the Confederated Salish and Kootenai Tribes. The numerous Shoshone semi-surrounded the Salish from northeast to southwest. The gambrel roof was unique to Puget Sound Coast Salish. The Tillamook were the southernmost branch of the Coast Salish. Ravalli County was once home to the Bitterroot Salish tribe. They spoke in seven types of Interior Salish languages related to the Puget Sound tribes. A legend amongst the Coast Salish peoples describes the origins of the western redcedar. The Squamish class structure is similar to that of other Coast Salish peoples. The name was derived from the Coast Salish peoples' name for Mt. Rainier in Washington. Two suspension bridges span a narrow section of the Salish Sea called the Tacoma Narrows. These Salish Defensive Sites are rock wall features constructed by Coast Salish peoples. The Flathead Nation continues to refer to their language and culture as Salish. Lushootseed is one of the Coast Salish languages. They were unknown to the Salish.