Special Projects

Bonneville Surface Flow Bypass System

Owner:
U.S. Army Corps of Engineers, Portland District

Contract Amount:$31,990,000

Location:
Columbia River, North Bonneville, WA

Project Duration:
08/2002-12/2003

Project Description:
This joint venture project involved constructing a bypass channel at Bonneville Dam intended to increase the survival rate of juvenile migrating fish.

The work on the new open flow channel included rock removal, excavation and the underwater placement of precast concrete elements and tremie underwater concrete fill. The finished product was a 3,000-foot-long, high-velocity concrete chute, with 25-foot-high walls, that safely transports fish through the powerhouse and into the new channel outfall.

This project won an Excellence in Concrete Award from the Oregon Concrete and Aggregate Producers Association and received an “Outstanding” Performance Evaluation from the U.S. Army Corps of Engineers, Portland District.