The second largest hydropower project in the world (after the Three Gorges China) turns on the water at night to become a laser show screen! We did a tour by day into the generating room and across the top of the Dam and came back later at night to the visitor center for a laser show about the cultural and political origins of this Depression Era project. Ten years in construction and major enhancements some 40 years later. Unfortunately the Native American Indians lost their salmon livelyhood!