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  • Celilo-Sylmar - construction, conductor


Project Highlights:

  • Upgrade to 265 miles of the 1,000 kV Direct Current Pacific Intertie
  • Total of 1,204 structures
  • Project split into three (3) sections with multiple contractors
  • Replacement of insulators and supporting hardware, vibration dampers, and dead end compression fittings
  • Installation of new shunts on conductor splice compression fittings and 240 new hold down weights
  • Replacement of all spacers and installation of 13,700 new spacers
Celilo-Sylmar No 1 Transmission - construction
Celilo-Sylmar No 1 Transmission Line - conductor

Project Summary

Client: Bonneville Power Administration
Location: Oregon State
Services Provided: Construction Management & Inspection
The Celilo-Sylmar No 1 Transmission line consisted of upgrading 265 miles of the 1,000 kV Direct Current Pacific Intertie which includes a total of 1204 structures.
This project was split into three sections and utilized multiple contractors to upgrade the line within a relatively short outage window each year. Because of the short time allotted to work on this project, several crews were focusing on multiple definable features of work simultaneously.
MacKay Sposito’s Construction Management team ensured that contractors worked per customer supplied drawings and specifications, tracked overall construction progress, reviewed contractor submitted work plans and schedules, and coordinated document submittals and RFI’s throughout the project’s duration. We ensured proper quality control was being performed by the contractor, provided overall quality management, ensured fair and equitable costs for large scope changes, and coordinated with tribal representatives to ensure culturally sensitive areas and artifacts were respected by all parties.