- Agency: U.S. Army Corps of Engineers, Portland District
- Contract Price: $820,000
- Completion: 2012
- Key Elements: Precision Rock Removal in Vulnerable Areas of the Spillway Stilling Basin
J.E. McAmis removed cobbles and boulders from within nine different downstream bays of the Bonneville Dam Spillway Stilling Basin. This work was performed utilizing a rotating hydraulic clamshell, BlueView sonar equipment, divers and a 10” airlift induction pump. The project was scheduled for a months time and was completed in 8 days.