Now Playing:


Oregon Field Guide

Elk Rock in Willamette River

This video is not currently available. We apologize for any inconvenience.

Millions of years ago, the Pacific Ocean covered the area where Portland now stands. An underwater volcano grew to a mountain the size of Mount Hood. That mountain is now the small outcropping known as Elk Rock Island — nearly all of its mass is buried in sediment and later lava flows.

First Broadcast: 1999
Producer: Jim Newman

More Oregon Field Guide

More OPB

Follow Oregon Field Guide

Send Oregon Field Guide A Message

Part of Episode