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Subject:   Seattle City Light Completes Largest Monopole Installation
For Immediate Release:   
8/8/2007  10:15:00 AM
For More Information Contact:


Seattle City Light Completes Largest Monopole Installation
210 feet, 71,000 pounds and 240,000 volts make installation tricky


SEATTLE - The largest monopole installation ever tackled by Seattle City Light has just been installed near the intersection of Interstate 90 and Interstate 405. The pole is part of transmission lines running along the Interstate 405 corridor between substations in Maple Valley and Bothell.

The project was part of the Washington State Department of Transportation (WSDOT) highway widening that started more than a year ago. WSDOT needed Seattle City Light to raise the height of its transmission lines near the intersection to provide additional clearance for a proposed bridge. Installing the 210 foot steel pole, that weighs 71,000 pounds, required significant effort and coordination between the utility and other agencies in the Bellevue area. City Light had to reroute electricity transmitted over the wires so workers could de-energize the existing lines that normally carry 240 thousand volts. The top sections weight was too heavy for the cranes, so the final assembly had to be completed by City Light line workers almost 200 feet above the ground.

City Light and the Northwest Power Pool had to coordinate with the Bonneville Power Administration to find alternative routes for the transmission of electricity during the construction. WSDOT and the traffic control agencies arranged for temporary road closures, as well as reduced lanes and lowering vehicle speeds during critical periods when the work was being done by City Light crews.

The project took a total of nine days with the bulk of the work occurring on nights and weekends for the least impact on traffic. Key players for Seattle City Light included: Kevin McClaskey, Sharon Ng, Tom Caddy along with 7 line crew and back-up crew members. The project was funded under the WSDOT nickel gas tax for highway improvements.

For more information, contact Peter Clarke at (206) 684-3602.

Photos available.



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