Chief Joseph to Monroe 500 kV

The Chief Joseph to Monroe 500 kV project is a 120-mi, 500 kV transmission line from the Army Corps of Engineers’ Chief Joseph dam in Bridgeport, Wash., to the town of Monroe in western Washington. As per the Bonneville Power Administration, the project’s sponsor, it is “associated with load service”, meaning it is needed for reliability purposes.

Project Sponsor Line Miles Voltage (kV) From State To State Year in Service
Bonneville Power Administration 120 500 WA WA 2024
Estimated Costs ($M) Voltage Type Project Status Project Group Origin Point Destination Point
384 Planned Chief Joseph Dam Monroe
Interstate Build Start NERC ISO/RTO Country Project Partners
WECC US