"Banks Lake" by NPS/Dubar , public domain

Ice Age Floods

Lower Columbia (Portland, OR)

brochure Ice Age Floods - Lower Columbia (Portland, OR)

Brochure of Lower Columbia (Portland, OR) 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