Bonneville Power Administration (BPA) proposes to construct the new 500/230-kilovolt (kV) Sixmile Canyon Substation. Sixmile Canyon Substation woul…
Office of NEPA Policy and Compliance
May 7, 2026
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Bonneville Power Administration (BPA) proposes to construct the new 500/230-kilovolt (kV) Sixmile Canyon Substation. Sixmile Canyon Substation would be sited along the existing BPA 500-kV Ashe-Slatt No.1 transmission line approximately 7 miles west of Boardman in Morrow County, Oregon.