Columbia Vista, the Clark County lumber mill that started in 1952, and is Clark County’s only lumber mill, has been sold to Western Forest Products Inc. of British Columbia for $30.5 million. …In addition to removing local ownership of the county’s lone surviving sawmill, the sale throws into doubt an active player in the local philanthropic community. Also, under its ownership the past two decades, Columbia Vista has built a reputation for green management practices and employee development programs. …Columbia Vista co-owner Bob Lewis, who serves as president, will remain with Vancouver, B.C.-based Western, to serve as a consultant for three years. “My wife and I are not getting any younger,” Lewis said Monday. “We are both nearly 70. …Western and Columbia Vista are the two largest suppliers of lumber to the Japanese housing market, Lewis said. “There are great synergies,” he said.