The City of Marlette will be coordinating the replacement of several broken and/or leaking water valves at the intersections of Main Street (M-53) and Morris Street and of Morris Street and Wilson Street. Read on...
On the D line, trains are running from 205th Street in The Bronx to Bay Parkway in Brooklyn, using the Manhattan Bridge, while the F train is running between 179th Street in Queens and Avenue X in Brooklyn, using a tunnel beneath the East River.
In New York City? For the most part yes. Various temporary night/weekend closures are announced in advance (the F-is-for-failure train seemingly never runs on weekends I'm in New York visiting friends on Roosevelt Island, ugh), but otherwise, the entire system runs 24/7.