If you're a night owl or work the graveyard shift, avoid the Triborough Bridge to or from Manhattan the next two days. The Harlem Lift Span portion of the bridge will be closed between 3:15 a.m. and 3:50 a.m. tomorrow and between 12 a.m. and 5 a.m. Thursday. That portion of the bridge will be closed tomorrow to allow marine traffic to pass. Maintenance work will close the bridge Thursday. The MTA expects delays during these early morning commutes.