U.S. Army Corps of Engineers rangers observe "Rooster Tail" outflows from Lucky Peak Dam, near Boise, Idaho, May 25, 2008. The "Rooster Tail" which results from the discharge of water through the original release structures of the dam under pressure from the lake above. Using a "flip bucket" to direct the spray high into the air, the erosive, scouring force of the water is greatly dissipated as it rises, rests and slowly falls back to the stream channel. The Rooster Tail only uses water from large releases required for flood risk management that exceed powerhouse capacity, thus no water is wasted for the display.

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Photo by: Keith Hyde |  VIRIN: 080525-A-GQ197-201.JPG