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I-84 Rooster Rock Overpass Project

Project Information
Interstate 84 Rooster Rock Overpass Project
Fall  2012 Update 
Project Completed
New Viaduct Height Benefical to Commercial Traffic
The eastbound exit from Interstate 84 at Rooster Rock State Park reopened April 6, 2012 after an ODOT contractor raised the height of the highway overpass.

The exit 25 overpass and the approach road was raised by nine inches, allowing the overpass to better accommodate large freeway freight loads.

To accomplish this height increase, the contractor cut an opening in each of the current bridge columns and jacked them up 9 inches. When the height was reached, the steel rebar was spliced adding new rebar and the opening filled with concrete. See the illustration below.

Purpose and Need
The overpass was built in 1957 to serve as access to Roster Rock State Park.  The original bridge clearance was 16 feet 10 inches. Since it was constructed, there have been several pavement overlays on I-84 reducing the clearance for trucks. The clearance is currently 16 feet 1 inch making it the lowest bridge in the Columbia River Gorge.  Taller trucks heading westbound must use alternate routes between Washington and Oregon.  Taller trucks that did not use the alternatives have hit the bridge. 
In 2010, the trucking industry asked ODOT to increase the vertical clearance in order to provide unimpeded mobility through the Gorge. 
ODOT determined that the best option to increase the vertical height with minimal impact to I-84 traffic was to raise the height of the overpass by raising the bridge, rather than lowering the pavement on I-84.

Project Elevation Illustration

Jacking Process
This illustration explains how the height of the bridge will be increased.

Project Location
The project is located on Interstate 84, east of Troutdale.

Project Budget
The construction budget for this project is federally funded and the cost is $631,211.01. 
The contractor is Wildish Standard Paving of Eugene, Oregon. 

ODOT Contact Information
For more information on the project, contact:
Susan Hanson, ODOT Community Affairs Coordinator