11/19/2020
SWAN LAKE HYDRO EXPANSION UTILIZED / RECORD RAINFALL
Ketchikan, AK – After a summer of record-setting rainfall, the Swan Lake Hydroelectric Facility reached full capacity following expansion totaling an additional 15 feet of storage for the first time. Due to drought conditions since construction was finished three years ago, this summer marked the first-time water levels made it all the way up on the flashboards, forcing a reservoir spill on July 24.
PPM was contracted to perform concrete demolition work on the spillway, procure and place Owner-designed embedded metals and seal plates for the flashboard system (a unique element to this project), erect the flashboard system, place Owner-provided embedded metals for the vertical gate and erect the vertical gate, place reinforced concrete on the wing walls, construct a new reinforced concrete center pier, and modify and seal existing parapet walls. PPM also made modifications to the intake building and constructed a utility trench and conduit bank that carries tubing and cabling from the intake building to the new vertical gate