Annual Columbia River dam and lock maintenance begins in March

The Columbia River has dams and locks inland from Vancouver, and billions in commerce pass though those locks each year by tug and barge. After all that wear and tear, the Army Corps of Engineers schedules yearly maintenance periods during which locks are closed and all equipment is inspected, repaired and maintained. It's part of the essential workings of a river system that is a huge economic engine for the region. We're coming up on one of those annual two week periods in March.