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Holcomb-Naselle 115-kV Transmission Line Rebuild
Pacific and Wahkiakum counties, Washington

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

The rebuild project would include replacement of existing electrical wires (conductors), and replacement of about 114 of the 159 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 installed or replaced one-half mile out from the Holcomb and Naselle substations.  All pole and conductor hardware would be inspected and replaced as needed, including insulators, guy wires, and cross arms. Fiber optic cable would be installed on the transmission line as well.  

To access parts of the line during construction, and to provide adequate access for regular maintenance cycles, about 90 feet of existing access roads would be reconstructed and 11 miles of existing roads would be improved. Three new stream culverts would be installed, and 12 existing stream 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 is 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:    

         Scoping comment period
         Draft EA Comment period
         Final Environmental analysis
         Finding of No Significant Impact (if warranted)
​Februrary 20, 2018 - March 26, 2018
August 7, 2019 to August 22, 2019
Winter 2019 - 2020
Winter 2019 - 2020
​         If decision to build, construction start ​Spring 2020

BPA will make the draft EA available for public review on August 7, 2019.The comment period will close on August 22, 2019. When commenting, refer to the Holcomb-Naselle Transmission Line Rebuild Project. All comments will be posted on the BPA comment website. There are several ways to comment.

Mail:     Bonneville Power Administration                        Toll-Free:          800-622-4519
             Public Affairs – DKE-7                                      Online:    
             P.O. Box 14428                                               FAX:                 503-230-4019
             Portland, OR 97291-4428


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

Public Letter             August 7, 2019
Comment Form        August 7, 2019
Draft EA                    August, 2019