Massive floods in Wasilla, Alaska (many years ago)

Here's a great article about a part of Alaska that was inundated by huge floods ways back in the day.

Here's a brief excerpt from the article:

The event was one of at least four "megafloods" as Glacial Lake Atna breached ice dams and discharged water. The lake covered more than 3,500 square miles in the Copper River Basin northeast of Anchorage and Wasilla.

You can see this on Google Maps by searching for Wasilla, Alaska, and then switching to the "terrain" view.