They sure built some cool Dam buildings: The powerhouse at the Ryan Dam in Great Falls, Montana, was built by the Great Falls Power Company between 1913 and 1915.

The dam (it spans 1,336 feet in length and 61 feet in height) was constructed on top of a 10-foot (3.0 m) cascade that Lewis and Clark observed to lie just upstream of Grand Fall. The next dam upstream is Cochrane Dam, then Rainbow Dam, and Black Eagle Dam. The next dam downstream is Morony Dam.