Oregon

Goggle "Megaflood of 1861), in which successive atmospheric rivers caused widespread flood along the entire west coast, including Oregon and Washington. In California, it created a vast lake covering the entire Sacramento and Central Valleys. Many homes and lives were lost, and the California cattle based ranchero economy was destroyed. The ones who were safe were the native Americans who saw the signs, knew from tribal lore what was coming, and relocated to high ground before the flooding.

Hopefully it won't happen again, but from what I've read it's a 100 to 200 year flood syndrome, and 1861 is 156 years ago, which puts us right in the middle of a return.

Since then, there are many dams on major watersheds, which might help manage the deluge if it happens. On the other hand, at a certain point, the dams have to release their captured water.

Keeping fingers crossed.