The Dalles Public Works will begin work Wednesday on replacement and upgrade of a water main in the alley between 2nd and 3rd Streets as well as Union and Liberty Streets.  During the first phase of work Wednesday and Thursday, crews will install a tap for the new water main on Union St. from 2nd St. to 3rd St.   Full street and alley closures will remain in place during work hours. Motor vehicles and bicyclists will be detoured to adjacent side streets.  Pedestrian and sidewalk access will remain open through the duration of this work.  Phase 2 will start this coming Monday, as the water main in the alley between 2nd St. and 3rd St. as well as Union St. and Liberty St will be replaced.  Work is expected to be completed by March 8.  A full alley closure will remain in place until work is completed. Motor vehicles, bicyclists and pedestrians will be detoured to adjacent side streets.  Work hours are from 7:30 a.m. to 3:00 p.m. on each scheduled work day.  If you have questions, please contact The Dalles Public Works at (541) 296-5401.