With a Month to Go, Lock Rehab Continues
East Oregonian, February 16, 2011
Lock improvement contractors at The Dalles Dam have demolished and disposed of the original gate.
Scott Clemans of the U.S. Army Corps of Engineers' Portland District, said the contractor also has demolished the concrete and removed the pintles, seal beam and wall blocks.
"The new seal beam has been installed, and concrete placement around it is under way, as are installation of wall blocks and drilling for pintle bolt anchors," he said Friday.
The pintle is part of the hinge that allows the lock doors to swing open and shut.
"The lock will be re-watered and the new gate leaves delivered next week," Clemans said.
The navigation lock is scheduled to be out of service through March 23 while workers replace the downstream miter gate and associated components.
Dix Corp. of Spokane, Wash., is the prime contractor for installing the gate. The firm has a $15.7 million contract with a $9 million addition because of a contract modification. Thompson Metal Fab of Vancouver, Wash., is Dix's gate fabrication subcontractor.
At John Day Dam, three of four new gate sections are in place. Both new friction sheaves have been installed and aligned. Electrical and gate control work is nearly complete, Clemans said. The last gate section was installed Saturday.
"Welding of the gate sections and reconnection of the wire ropes to the gate and counterweights will be completed by Feb. 28," he said. "We will begin test-lifting the gate by March 4."
The navigation lock is scheduled to be out of service through March 18 to replace the downstream gate and the two friction sheaves for its lifting mechanism.
Advanced American Construction of Portland is the prime contractor. It has a $15.6 million contract with a $2.2 million addition because of a contract modification. Oregon Iron Works was AAC's fabrication subcontractor.
Extended Navigation Lock Outage US Army Corps of Engineers
learn more on topics covered in the film
see the video
read the script
learn the songs