CG Engineering, civil and structural engineering and planning for residential and commercial projects

Cowlitz Falls Dam Collector Project

Cowlitz Falls, WA

Principal-in-charge: Greg Guillen, PE, SE
Structural Project Manager: Carolyn Jewett, PE, SE

Structural Elements:
Cast-in-place concrete

Awarded ENR Northwest’s 2018 Best Projects

CG Engineering provided structural engineering for the Cowlitz Falls Dam North Shore Collector project. Downstream of the existing dam we designed cast-in-place concrete for the collector structure, foundations for the bypass flume and support a pipe. The collector is a concrete basin with a 30” thick base slab and 18” thick walls supported on piles with anchors. The $32.3-million North Shore Collector project upgraded the salmon runs, improving fish passage returns to 95% from 50%.