St Francis Dam "Senate Passes Decade’s Biggest Public Lands Bill, Adding 1.3 Million Acres of Wilderness, About Half in SoCal "

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The bill also designates the former Saint Francis Dam site in California as a national memorial and monument. The dam outside Los Angeles collapsed in 1928, killing 431 people in one of the largest tragedies in California history."

https://ktla.com/2019/02/12/senate-passes-decades-biggest-public-lands-bill-adding-1-3-acres-of-new-wilderness/