One of the largest waterfalls in the United States at some 212 feet tall and 900 feet wide, Shoshone Falls can be spectacular when the Snake River is running full. They’re located in the Snake River Canyon about three miles upstream from Twin Falls, Idaho, and form the centerpiece of Twin Falls city park. A fraction of the flow is diverted to a small hydropower plant (capacity a little less than 15 megawatts), which has minimal effect on the falls’ display. The major effect on the flow is upstream diversions…