The Clem Elum Lake Fish Passage Juvenile Tunnel is a $15.2 million project. Northbank is responsible for installing a 10’ diameter fish passage tunnel over 1200’ long through glacial outwash from the outlet portal below the dam to the 120’ diameter oval secant pile shaft upstream of the dam as well as completing the helix chamber foundation system. Work includes mass excavation, shoring, tunnel excavation and lining, shaft excavation and concrete. Site work began spring 2018 and will be complete by August 2020.
Bureau of Reclamation