|
|
|
|
|
|
Express Tour - Section IVThrough the Columbia Gorge to the Pacific
|
WALLS OF WATER RAGE THROUGH THE COLUMBIA GORGEWater volumes exceeded the capacity of the gorge near today's John Day Dam, creating another impoundment which backflooded into the Dalles and Umatilla basins. Surging water gouged the walls of the gorge to their modern near-vertical alignment, thereby creating the complex of waterfalls at the gorge's west end. Patches of scabland were created near the Dalles and extensive sand and gravel bars were dropped into the valleys of tributary streams. View Larger Map |
|
THE FLOODS RUSH TO THE OCEAN, WHILE BRIEFLY DROWNING
|
 |
|
| A check point at Kalama caused the floods to form another temporary lake which flooded the Willamette Valley as far south as Eugene, OR. Large lowland tracts in Washington across the river from Portland also were underwater. The flood crests then dropped rapidly as they reached Astoria and the Ice-Age seacoast 40 miles west of that modern city. Flood debris has accumulated to a depth of 800 feet in the Columbia River's bed west of Astoria. |
Ice Age Floods Express Tour: Continue | ||||
CONTACT
SITE MAP
IAFI
LINKS
© 2008
