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Location: Ariel, WA
Owner/Client: PacifiCorp
Completed: 2015

We expanded the undersized intake structure for this fish hatchery and replaced the dilapidated dam, which included installation of new weir gates and traveling screens, as well as rebuilding the intake for the hatchery. 

Our work included installation of a new 24-inch pipe that had to tie-in to the 48-inch main feed into the hatchery 10 feet underground. In order to dewater the site, we drove in temporary sheet pile upstream and ran bypass piping through the sheet pile and around the site, draining downstream into the creek to maintain minimum flows for the fish. Baker tanks were used to filtrate the dewatering system to keep turbidity within acceptable levels.   

The concrete work required precision work and screens to accommodate 32-degree angles. At the end of the project, we removed the coffer dam and dewatered to ensure the new system functioned properly. 

Our full scope included demolishing the existing intake structure and log boom; removing and replacing the grating, traveling screen spray system, and slide gates; partially removing and installing sheet pile dam and boards; furnishing and installing new metal walkways, downward opening gate, trash racks, and appurtenant concrete work; and installing new traveling screens and log boom. We completed the project on schedule and within budget.