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Holcomb-Naselle 115-kV Transmission Line Rebuild
Pacific County, Washington

Bonneville Power Administration (BPA) proposes to rebuild the 21 mile-long Holcomb-Naselle 115-kilovolt (kV) transmission line located in Pacific County, Washington. The line was constructed in 1949 and is reaching the end of its effective operational life—the line is currently not operating at full capacity due to the potential for compression fitting failure during high electrical load events.

The rebuild project would include removal and replacement of existing electrical wires (conductors), and replacement of about 50 of the 160 wood-pole structures that do not meet current standards. The conductors would be strung to a higher tension and an overhead ground wire would be replaced one mile outside of the Holcomb and Naselle Substations.  All pole and conductor hardware would be inspected and replaced as needed, including insulators, guy wires, and cross arms. All structures would be designed to support future installation of fiber optic cable – no fiber installation is proposed at this time.  

To access parts of the line during construction, and to provide adequate access for regular maintenance cycles, about 400 feet of existing access roads would be reconstructed and 15 miles of existing roads would be improved. One new bridge crossing and about 32 new culverts would be installed, and 17 existing culverts would be replaced. Up to 400 trees that have the potential to fall into the transmission line may need to be removed adjacent to the existing right-of-way. In addition, some equipment replacements and upgrades would occur within the fenced electrical yards of the Holcomb and Naselle Substations. 

BPA will be conducting an environmental review to understand the potential environmental impacts of this proposal. The environmental review will analyze anticipated impacts to natural and human resources and will identity mitigation measures to help avoid or minimize impacts, as needed. During this process, BPA will work with federal, state and local agencies, Tribes, potentially affected landowners, and other interest groups.  The proposed schedule for the environmental review is as follows:     

         Public comment period
         Environmental and engineering surveys
         Final Environmental analysis
         If decision to build, construction start​
​Februrary 20, 2018 - March 26, 2018
Spring 2018 - 2019
Fall/Winter 2019

Beginning this Spring 2018, BPA staff or contractors in the area will conduct engineering and environmental surveys.  In addition, please note that separate from this process, regular line and vegetation maintenance activities may continue to occur along the line to keep it safely operating. 


For environmental information, contact:
Tish Eaton                                                                  
Environmental Protection Specialist                               
Bonneville Power Administration – ECT-4                          
PO Box 3621
Portland, Oregon 97208-3621​

Direct line:  503-230-3469 


For project information, contact:
Amanda Williams                                                             
Project Manager                                                               
Bonneville Power Administration – TEP-TPP-1                       
PO Box 61409
Vancouver, WA 98666-1409​

Direct line:  503-230-5922

Public comments received
Public Letter            February 20, 2018
Project Map             February 20, 2018
Comment Form       February 20, 2018