Roosevelt Island Transportation This Weekend - E Train Replaces F For Roosevelt Island Service To And From Manhattan

According to the MTA:

SIGNAL IMPROVEMENTS | 9:45 PM Fri, Aug 3 to 5 AM Mon, Aug 6 Coney Island-bound F trains run via the E from Roosevelt Av, Queens to 50 St, Manhattan, then via the A express to Jay St-MetroTech, Brooklyn

E Trains run via the in F both directions between 21 St-Queensbridge, Queens and Lexington Av/63 St, Manhattan and via the R between 57 St-7 Av and Whitehall St, the last stop

Travel Alternatives:
For 21 St-Queensbridge, Roosevelt Island and Lexington Av/63 St, take the E instead.

SIGNAL IMPROVEMENTS | 9:45 PM Fri, Aug 3 to 5 AM Mon, Aug 6 Jamaica-bound F trains are rerouted via the E after 47-50 Sts, Manhattan to Roosevelt Av, Queens

No Jamaica-bound service at Lexington Av/63 St, Roosevelt Island and 21 St-Queensbridge.

E trains run via the F, in both directions, between 21 St-Queensbridge and Lexington Av/63 St and via the R between 57 St-7 Av and Whitehall St.

Also:

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

Both Roosevelt Island Tram Cabins are in operation.

There is Roosevelt Island ferry service on the Astoria Route. Here's the new summer schedule for Roosevelt Island ferry service.