Current contract at $50-plus million: Corps Lower Granite project involves ‘daylighting’

The Walla Walla District of the U.S. Army Corps of Engineers is upgrading the Lower Granite Lock and Dam Juvenile Fish Facility.

“Fish facility improvements are an important part of the corps’ mission to save salmon and other endangered or threatened species,” said corps spokesman Bruce Henrickson.

The overall upgrade includes “daylighting” the current below-ground juvenile fish transportation piping from the dam to the juvenile fish facility.

“Adult fish migrate upstream via fish ladders to their spawning grounds,” Henrickson said. “Juvenile fish born there migrate downstream, passing over, a...