I found some stories of dam collapses that might interest you:
Piute County, Utah, 1914
Baldwin Hills, Los Angeles, 1963 - (Click to view video)
China, 1975
Teton dam, Idaho, 1976
Syria, 2002
Lamar County, Mississippi, 2004

These were mentioned, but I haven't found a story about them yet:
Santa Paula, California, 1928
Fréjus, France, 1959
Man, West Virginia, 1972