Environmental

The Hancock Creek and Calligan Creek Hydroelectric projects established two run-of-the-river facilities that supply renewable energy to Snohomish County, situated in a remote 89,500-acre timber forest. Construction began with diversion structures to channel creek flow into sluiceways, followed by concrete weir systems directing excess water into pipelines (penstocks) leading to powerhouses with energy-producing turbines. Building the penstock involved a contractor-designed haul road, installing 5,900 feet of HDPE pipe and 7,900 feet of welded steel pipe, along with specialized shoring and dewatering. The turbine house was constructed using over 2,800 cubic yards of concrete, with each turbine capable of producing 6,000 KW of power.