The L Train will NOT be running on week ends starting Friday night April 17 and continuing for 5 weeks!! There will be NO service between Lorimer and Manhattan. The G train will still be operational. Also Ferry service runs from Manhattan to the North 6th st water front and from there you can take the Bedford L Train to Graham. So very sorry for the inconvenience. Also Uber is offering $5 rides. See info here https://blog.uber.com/nyc-uberpool-l-train-5-dollar-fares
Here are more alternatives: