According to the MTA , there will be Roosevelt Island F Train service

to and from Manhattan this weekend.

But:

… TRACK REPLACEMENT | 9:30 PM Fri, Sep 21 to 5 AM Mon, Sep 24 F Service is rerouted in Manhattan and Brooklyn

No F service at 57 St, 47-50 Sts, 42 St-Bryant Pk, 23 St, 14 St, W 4 St, B’way-Lafayette St, 2 Av, Delancey St/Essex St, East Broadway, and York St.

F Service runs between Jamaica-179 St and Lexington Av-63 St, and via the Q express to/from Atlantic Av-Barclays Ctr…

Also:

STATION ENHANCEMENTS | Until December 2018 57 St F Station is closed

Both Roosevelt Island Tram Cabins are in operation but the North Cabin is working at half capacity because of a malfunctioning gear box that is waiting for replacement.

There is Roosevelt Island ferry service on the Astoria Route. Here’s the new Fall Schedule for Roosevelt Island ferry service. UPDATE 12 PM – The Tram cabins are both running at full capacity.