Colliding Rivers
Posted by: Groundspeak Premium Member Volcanoguy
N 43° 17.866 W 123° 06.076
10T E 491785 N 4793887
Quick Description: This sign is located at the Colliding Rivers Viewpoint in Glide, Oregon.
Location: Oregon, United States
Date Posted: 1/21/2007 3:44:37 PM
Waymark Code: WM15FR
Published By: Groundspeak Premium Member silverquill
Views: 61

Long Description:

This sign is located at the viewing platform at the Colliding Rivers Viewpoint in Glide, Oregon.

Marker Name: Colliding Rivers
Marker Text: Under flood conditions, the Little River and the North Umpqua River join in a violent head-on collision. During lower summertime flows, the rivers join in a common pool with only a small “collision”.
At this location, this sign would have been under five feet of water when the flood of 1964 crested after a low elevation snow fall was followed by a warm, heavy rain. During the flood of 1955 the North Umpqua River pushed back the Little River approximately 100 yards.
Why the Rivers Collide
As you see before you, these rivers virtually flow towards one another. This phenomenon is created by resistant sills of basalt that deflect Little River (south) and the North Umpqua River (north) and force the two rivers into a collision course. The combined force of the two rivers have broken through the basalt sill and the joined rivers head west eventually flow into the Pacific Ocean at Reedsport.
Once Under an Ancient Sea
This site was beneath the Pacific Ocean for millions of years. Sea bed deposits consisting of shale, seashell, coal, conglomerate and silica have eroded by the action of the colliding rivers.

Historic Topic: Geological

Group Responsible for placement: Forest Service

Marker Type: Roadside

Region: Willamette Valley

County: Douglas

State of Oregon Historical Marker "Beaver Board": Not listed

Web link to additional information: Not listed

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Recent Visits/Logs:
Date Logged Log User Rating  
Queens Blessing visited Colliding Rivers 7/4/2009 Queens Blessing visited it
Volcanoguy visited Colliding Rivers 1/22/2007 Volcanoguy visited it

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