"Banks Lake" by NPS/Dubar , public domain

Ice Age Floods

Columbia Gorge (Southern WA)

brochure Ice Age Floods - Columbia Gorge (Southern WA)

Brochure of Columbia Gorge (Southern WA) part of Ice Age Floods National Geologic Trail (NGT) in Washington, Oregon, Idaho and Montana. Published by the Ice Age Floods Institute

source

iafi.org

also available

National Parks
USFS NW