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Grand Coulee Line Replacement Project
Grant and Okanogan Counties, Washington


    Bonneville Power Administration (BPA) has been asked by the Bureau of Reclamation (Reclamation) to design and construct six new 500-kV transmission lines at Grand Coulee Dam.

    These proposed new overhead lines would replace six existing underground lines. The existing lines consist of eighteen aging, oil-filled cables between Grand Coulee's third powerhouse and the 500-kV spreading yard, both of which are operated and maintained by Reclamation. In the current underground configuration, the cables are more susceptible to threats like fire, which could likely lead to multiple line failures in the future. The proposed overhead solution is less likely to experience multiple line failures, which helps ensure safe and reliable transmission of power from Grand Coulee Dam. The new lines would transfer power that is generated at the third powerhouse, across the Columbia River near the visitor center area, and then proceed uphill where they will connect to existing lines that transfer power from this area into the Regional power grid.

    To understand the potential environmental impacts of this proposal, BPA and Reclamation will prepare an Environmental Assessment (EA). In the EA, we will study potential impacts on the natural and built environment caused by the proposed project and any alternatives, including the no-action alternative. The EA will also describe any mitigation measures that can be incorporated into the proposed project to minimize impacts. During this process, BPA and Reclamation will seek public input and comments.


    Based upon the public comments and further environmental review, BPA has finalized the EA for Reclamation's Grand Coulee 500- kV Transmission Line Replacement Project in Douglas, Grant, and Okanogan counties, Washington. Reclamation has decided to proceed with the Preferred Alternative (Overhead Alternative #2). BPA will replace the existing underground transmission lines with new overhead transmission lines, will construct new tower structures, will improve some access roads, and will add some new access roads within the Project Area.

    All project documents may be found below. However, if you would like to request a hard copy of the Revision Sheet for the EA, you can do so by calling the BPA toll-free document request line at 1-800-622-4520.


    For more information related to construction activities, please contact Mark Korsness, Project Manager, Bonneville Power Administration - KEC-4, P.O. Box 3621, Portland, Oregon, 97208-3621; direct telephone number 360-619-6326, toll-free telephone number 1-800-282-3713; e-mail address:

    For more information related to the environmental planning and compliance process, please contact Andrew M. Montaņo, Environmental Protection Specialist, Bonneville Power Administration - KEC-4, P.O. Box 3621, Portland, Oregon, 97208-3621; direct telephone number 503-230-4145, toll-free telephone number 1-800-282-3713, fax number 503-230-5699;
    e-mail address:


    Public Letter Announcing FONSIs (34Kb pdf) (12/16/11)
    Revision Sheet for the EA (418Kb pdf) (12/16/11)
    BPA FONSI (42Kb pdf) (12/16/11)
    Mitigation Action Plan (37Kb pdf) (12/16/11)
    Reclamation FONSI (374Kb pdf) (12/03/11)
    Grand Coulee Project Video (122MB wmv) (05/02/11)
    Preliminary EA Public Letter (28Kb pdf) (05/02/11)
    Preliminary EA Comment Form (34Kb pdf) (05/02/11)
    Preliminary EA (3.1MB pdf) (May 2011)
    Project Update Letter (34Kb pdf) (11/05/10)
    Updated Project Map (1.5MB pdf) (09/27/10)
    Final Scoping Summary Report (1MB pdf) (10/27/09)
    Second Scoping Meeting Postcard to the Public (44Kb pdf) (07/15/09)
    First Scoping Meeting Letter to the Public (31Kb pdf) (07/06/09)
    Comment Form (32Kb pdf) (07/06/09)
    Project Vicinity Map (266Kb pdf) (06/25/09)

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 Page last reviewed on 6/29/2009 3:13:46 PM