Portland General Electric (PGE) operated a 3.2-mile long flume that supplied water to a hydroelectric facility in the Sandy River watershed. During exceptional rainfall in February 1996, approximately 100 feet of the flume was destroyed by a debris flow landslide.
Landslide Technology was immediately retained by PGE to investigate the slide area and provide recommendations for repairing the flume. Landslide Technology conducted geologic reconnaissance and mapping, and developed a rockfill stabilization plan on the extremely steep slope. Difficult access required winching construction equipment down a cliff to the slide area, and removing the same equipment by helicopter airlift. The project was successfully completed ahead of PGE's desired schedule.