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The photos of Armstead, Montana depict as town that disappeared beneath Happy Hawkins lake behind the Clark Canyon Dam in the early 1960's. It was important because it is the site of Camp Fortunate where the Lewis and Clark Expedition met the Shoshone Indians and Sacajawea recognized her brother. Both the Union Pacific Train that ran from Salt Lake City to Butte and the Gilmore and Pittsburg Railroad had depots there. The collection was housed in the archives of the Beaverhead County Museum where the originals continue to be held.