As a result of Wednesday’s heavy rain and subsequent flooding, MWRA contractors will conduct necessary repairs on Medford St., between Somerville Ave. and South St., on Thursday evening from 6 to approximately 9 p.m., and on Friday, Oct. 2, from 9 a.m. to approximately 4 p.m. During the work, Medford St. in this area will be closed to through traffic. Motorists are asked to consider alternate routes if possible, and to follow posted detours.