Prehistoric River
Posted by: Groundspeak Premium Member Volcanoguy
N 43° 55.090 W 121° 00.500
10T E 659900 N 4864712
Beaver Board - Oregon Geology - Prehistoric River
Waymark Code: WM87Y
Location: Oregon, United States
Date Posted: 03/02/2006
Published By:Groundspeak Premium Member Volcanoguy
Views: 55

This “Beaver Board” sign on Oregon Geology about a Prehistoric River is located near milepost 20 on U.S. Hwy 20 east of Bend.

Marker Name: Prehistoric River
Marker Text: Ages ago a river flowed across the High Desert country in the rocky canyon several hundred yards beyond this marker. The prehistoric river drained a large ice age lake that formed from the blocking of normal drainage in the area by lava flows. The lake covered a large area to the east in the vicinity of the present Millican country.
During periods of high water the lake spilled over a low pass at the eastern edge of Horse Ride - the ridge seen behind you and to your right. The escaping water cut into the loosely consolidated lava flows creating the rocky gorge visible from the viewpoint and later called Dry River. Once free from the Horse Ridge barrier Dry River flowed north into the present Crooked River. Evidence indicates that the ancient river was once the scene of many indian encampments near its source at the lake.

Historic Topic: Geological

Group Responsible for placement: State of Oregon

Marker Type: Roadside

Region: Central Oregon

County: Deschutes

State of Oregon Historical Marker "Beaver Board": [Web Link]

Web link to additional information: [Web Link]

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Recent Visits/Logs:
Date Logged Log User Rating  
OregonTrailRanger visited Prehistoric River 11/27/2020 OregonTrailRanger visited it
torsi visited Prehistoric River 10/20/2012 torsi visited it
Sage Rat 5 visited Prehistoric River 02/18/2009 Sage Rat 5 visited it
Queens Blessing visited Prehistoric River 12/14/2008 Queens Blessing visited it
HappyFrog (& gang) visited Prehistoric River 06/29/2008 HappyFrog (& gang) visited it
Volcanoguy visited Prehistoric River 03/02/2006 Volcanoguy visited it

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