Ebey Slough Case Study 08.07.10 Page 1 of 2 Ebey Slough Case Study Steel Monopoles Replace Deteriorating H-Frame Wood Poles in Historic Estuary In the Ebey Slough basin of Snohomish County, Washington, nearly two miles of high-voltage transmission lines traversed decades-old, deteriorating wood poles, which jeopardized the safety and reliability of an essential part of the Puget Sound Energy (PSE) power grid. The H-frame structures were originall

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