UPSTREAM GATE REPLACEMENT, CONTROLS UPGRADE, AND DOWNSTREAM GATE GUDGEON REPLACEMENT

The Dalles Navigational Lock Upstream Gate Replacement, Controls Upgrade, and Downstream Gate Gudgeon Replacement was awarded to Northbank on a best value basis. The entire Columbia and Snake River system was shut down from December 12, 2016 through March 20, 2017 to perform major repairs and upgrades at majority of the dams.

The upstream gate replacement consists of removal of the old upstream gate, fabrication and installation of a new upstream gate, replacement of the gate anchorage system, and replacement of the gate operating machinery and controls. The downstream gate work includes replacement of the gudgeons, quoin and miter block adjustments, diagonal tensioning, seal replacement, and installation of an impressed current cathodic protection system. The controls upgrade includes upgrades of the navigational lock’s control system and installation of a new power distribution system.

Northbank was able to complete the project on-time, even though the local area experienced the worst extended weather conditions in the past 25 years.