CX-018950: Maple Valley - Duwamish No. 1 Impairment Removal

Bonneville Power Administration proposes to remove one critical line impairment where the distance from the conductor to the ground surface does not have adequate clearance for safe and reliable operation, at structure 1/3 of the Maple Valley-Duwamish No. 1 transmission line in King County, Washington. Ground to conductor clearance will be achieved by installing a 2-pole wooden prop structure located approximately 450 feet ahead online (west) of the existing structure 1/3 within the Bonneville Power Administration right-of-way. The prop structure would stand 65 feet in height above ground and would be buried 10 feet deep. A drill would be used to create boreholes where the structure poles would be placed. No other ground disturbance is proposed for the project. General equipment used for this type of project includes cranes and heavy duty trucks.