U.S. awards fish passage construction for 810-MW Lower Granite Dam

Garco Construction Inc. has received a $48.3 million contract to upgrade the juvenile fish passage facility at 810-MW Lower Granite Dam on the Snake River in Washington.

The U.S. Army Corps of Engineers took bids in September for major construction to upgrade Lower Granite Juvenile Fish Facility Phase 1a.  

Garco, of Spokane, Wash., is to construct an upgraded fish passage system to provide additional water through enlarged 14-inch orifices. To accommodate the added flow, the Corps said concrete mining is required to enlarge the existing collection channel and the existing transportation channel.

A new section of transportation channel is to be mined through the dam to exit the downstream face of the dam. Additionally, a new transportation channel and associated systems are to be installed from the dam to the juvenile fish facility.

The Corps’ Walla Walla District requested information Oct. 2 about firms able to build structures to provide fishway temperature improvements at Lower Granite. It also issued a $2.7 million contract in July to Engineered Heavy Services LLC to modify a juvenile fish collection channel at the project.


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