Bonneville Power Administration (BPA) proposes to rebuild the Walla Walla-Tucannon River 115-kilovolt (kV)transmission line. The 47-mile long, wood-pole line extends from the BPA Walla Walla substation to the BPA Tucannon River substation in Walla Walla and Columbia Counties, Washington. The project would include replacing wood poles, associated structural components, and conductor, installing 24 new structures, improvements to some existing access roads, widening of the transmission line right-of-way, construction of less than 1 mile of new access roads, and some vegetation removal. The rebuild would enable BPA to maintain reliable electric service and avoid risks to the public and worker safety. The line would continue to operate at 115-kV.
To understand potential impacts of the proposal, BPA conducted public meetings in March 2010, provided project information to interested parties, and accepted comments on the proposal. Since that time, BPA has conducted an environmental review of the proposal and prepared a preliminary environmental assessment (EA). The preliminary EA describes the proposed rebuild project, the no action alternative, potential environmental impacts, and proposed mitigation measures that could avoid or minimize those impacts. The preliminary EA also provides an assessment of the floodplains and wetlands that are potentially affected by the project.
BPA decided to rebuild the Walla Walla-Tucannon transmission line based on the final environmental assessment (EA) and finding of no significant impact (FONSI). The final EA includes a Floodplain Statement of Findings and a Mitigation Action Plan that outlines the mitigation measures that are being implemented. Construction began in June 2011 and was completed in November 2011.
|Gene Lynard, BPA Environmental Lead
|Bonneville Power Administration - ECT-4
|P.O. Box 3621
Portland, OR 97208-3621
FINAL EA / FONSI:
Public Letter (05/20/2011)
Revision Sheet (05/16/2011)
Mitigation Action Plan (05/16/2011)
Preliminary EA comments received
Public Letter (04/07/2011)
Comment Form (04/07/2011)
Preliminary EA (04/05/2011)
Scoping comments received
Public Letter (03/01/2010)
Comment Form (03/01/2010)
Project Vicinity Map (02/22/2010)