The U.S. Army Corps of Engineers reopened the navigation lock at The Dalles Dam o river traffic Monday afternoon.  The Corps of Engineers is nearing the scheduled end of an extended navigation lock maintenance outage, which began in December.  The coordinated 14-week-long closure has affected all eight Corps navigation locks on the Columbia and Snake rivers, during which time repairs and maintenance is being completed.  Bonneville Lock and Dam reopened in February as scheduled, McNary reopened Friday and John Day reopened Saturday.  Lower Monumental and Lower Granite locks and dams returned to service late Monday night.  Little Goose and Ice Harbor dam’s navigation locks, on Washington’s Snake River, cannot be returned to service yet because of on-site work complications.  Ice Harbor is tentatively scheduled to return their lock to service on Thursday.  Little Goose is currently estimated to reopen their lock on April 2.