The following press release was published by the U.S. Department of the Interior, National Park Service on March 31. It is reproduced in full below.

Ice Age Floods National Geologic Trail includes Bull Lake Rd in Northwestern Montana. Here glacial Lake Missoula reached all the way up the valley to where Bull Lake sits today.

Ice Age Floods National Geologic Trail

Source: U.S. Department of the Interior, National Park Service