An Oregon contractor has been awarded a $9.3 million contract for repair, cleaning and recoating of the Salt Creek Falls Tunnel and four half viaducts in Willamette, OR.
| The half-viaducts are considered structurally deficient and/or need barrier improvements.|
The Oregon Department of Transportation awarded the $9,374,871.80 project to Capital Concrete Construction Inc., of Aumsville, OR.
Capital bested eight other bidders for the project. Only two bids fell within ODOT’s budget estimate of $5 million to $10 million.
Work on the project began in May and is expected to take two years.
Built in 1939, the 905-foot-long, 27-foot-wide tunnel needs serious repair, and the adjacent west half viaduct and the three east viaducts are failing and need to be replaced.
The half viaducts—225 feet, 250 feet, 125 feet and 175 feet long—have exposed reinforcement bar and severely cracked concrete. They are currently supported by temporary timber bracing that ODOT maintenance put in place in 2008. In addition, the tunnel liner is cracked and leaking; the tunnel has limited vertical clearance (12 feet, 10 inches); and the tunnel floor is in disrepair.
The tunnel and viaducts opened in 1939.
The half viaducts (considered bridges on a structural level) are all either structurally deficient or need barrier improvements to meet current safety standards.
The Salt Creek Falls Tunnel is located east of Oakridge on OR 58 (Willamette Highway) in the Willamette National Forest.
About the Project
The project will include:
• Replacing the half viaduct west of the tunnel and the three east of the tunnel;
• Constructing variable message signs east and west of the tunnel;
• Repairing the tunnel liner by crack injections; and
• Repairing and lowering the tunnel floor by 18 inches.
In addition, the vertical alignment of all four viaducts must be set in relationship to the new tunnel floor elevation. If the floor is not lowered now, while the viaducts are replaced, the opportunity will be lost for the 75- to 100-year life of the viaducts.
This project also includes a lump sum item for cleaning and coating concrete structures and a total of 13,832 square yards of warranted spray-applied membrane waterproofing application.
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