The project will remove two de-energized transmission lines located in the Portland Metro area. BPA hasn’t used either line in many years, and we do not intend to place them back into service. The wood pole structures and hardware supporting the conductor (transmission wires) have deteriorated. Removing these lines eliminates a potential public safety risk and allows certain portions of the transmission rights-of-way to return to more natural environment.
The entire remaining length of the Keeler-Pennwalt transmission line, from Keeler Substation to Structure 9/6, will be removed (approximately 9 miles). Approximately 3 miles of the St. John’s Tap to Keeler-Oregon City line, from structure 3/1 to structure 5/12, will also be removed. A total of 109 wood pole structures, conductor, and associated hardware will be removed and disposed of as part of this project.
To perform the work, first the conductor and pole-mounted hardware must be disconnected and removed. Then the wood poles will be removed. At structure sites that can be accessed by heavy equipment, such as a boom truck, individual poles will be pulled directly out of the ground. The removed poles will be placed on a pole truck (log truck) by the boom truck, or temporarily placed on the ground near the work area and picked up by a self-loading pole truck.
At structure sites that cannot be accessed by heavy equipment, or where the condition of the pole presents a safety risk for crews, individual poles will be felled onto the ROW, cut into smaller pieces, and removed from the ROW. The remaining butt section will be cut off between zero and two feet below ground level. At all locations, holes will be backfilled with clean imported material, and appropriate erosion and sediment controls will be installed at work sites where the ground has been disturbed.
Predominant land uses along the existing transmission corridors include park lands managed by the City of Portland Parks and Recreation Division and Tualatin Hills Parks and Recreation, and suburban residential areas.