Idaho Power's Shoshone Falls Dam is located directly upstream from the falls and diverts water to the Shoshone hydroelectric plant, further reducing the water volume. Idaho Power is required to maintain a minimum daytime "scenic flow" of from April through Labor Day, although even this small flow can be difficult to achieve due to a lack of water in the Snake River. Further complicating the issue is that most irrigation water is needed in the summer, which coincides with the peak tourist season. The Shoshone power plant draws up to of water per second; thus, the flow of the falls will only increase if the Snake River flow exceeds the combined plant capacity and scenic flow requirement. The best time to view the falls is between April and June, when snowmelt is peaking, and when water is released from upriver reservoirs to assist steelhead migration.