A federal judge in Michigan has ruled that the owners of a dam that collapsed in 2020 violated state law by failing to respond in time to known safety threats.

The collapse of Midland’s Edenville Dam led to massive flooding, and caused 200 million dollars in damage.

The US District Court Judge called the May 2020 collapse “one of the worst environmental disasters that the state of Michigan has ever experienced.”

The company that owned the two dams in that area filed for bankruptcy that same year and sold them to a local association of lake property owners.

Bridge Michigan reports that the ruling, which was handed down on Friday, cited evidence that the company was aware the dam might fail as early as 2010, a full decade before the catastrophe.