As part of America's 250th celebration, Idaho News 6 is spotlighting historical events and locations in the great state of Idaho.50 years ago, June 5, 1976, the Teton Dam gave out, sending floodwaters into the valley, devastating the communities of Rexburg, Sugar City and beyond. WATCH: Teton Dam survivor describes the day the dam broke America 250: The Teton Dam FailureAnita Thompson Knapp is a Teton Dam survivor. She says as a young girl, it's…