The Dalles Public Works on Monday began the first phase of a storm water catch basin project on East 4th Street and Union Street. The first project area is on East 4th between Union and Court Streets. Work on the first phase is expected to be done on Wednesday. Until then, no through traffic in either direction on East 4th will be allowed between Union and Court Streets during work hours, 7:00 a.m. to 5:00 p.m. Through traffic will detour to East 3rd Street or East 5th. On Wednesday, The Dalles Public Works will move the project area to Union Street between 4th and 5th Streets, with work to be finished on Friday. From Wednesday to Friday, no through traffic in either direction on Union Street will be allowed between 4th and 5th Streets during work hours, from 7:00 a.m. to 5:00 p.m. Through traffic will detour to Court Street.