The scaleshell is a freshwater mussel that was listed an endangered species in 2001 by the U.S. Fish & Wildlife Service. The scaleshell mussel is a relatively small freshwater mussel with a thin, fragile shell and faint green rays. It grows to about one to four inches in length. The inside of the shell is pinkish white or light purple and highly iridescent. The scaleshell gets its name from the scaly appearance of the shell, which is only seen in females.
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The "Yellow Stone," a steamboat belonging the John Jacob Astor's American Fur Company, was the first steamship to ascend the "Big Muddy" into what would become the Dakota Territory and eventually the present-day Dakotas and Montana. More...