BOARDMAN, Ore. – The U.S. Army Corps of Engineers plans to conduct an extended navigation lock outage beginning December 12, 2016, Corps officials from Walla Walla and Portland districts announced today during a regional navigation meeting held at the Port of Morrow SAGE Center in Boardman, Oregon. The 14-week-long closure will affect all navigation locks operated by the Corps on the Columbia and Snake rivers. The extended lock outage plan is a coordinated effort between Portland and Walla Walla districts, whose goal is to prioritize needed lock repairs along the Columbia and Snake rivers to minimize the impact lock closures have on river users.