ROBERT MOSES - Most of Long Island's beaches took a beating from Irene, which could mean bad news for Labor Day weekend.

At Robert Moses State Park, which has already endured severe beach erosion over the past several years, parks officials say even some of the sand dunes have now been swept away.

New York State Parks Regional Director George Gorman said crews will open up the Fire Island inlet and try to put sand back on the beaches where it came from, but that it's unclear what condition they'll be in for the upcoming holiday.

At Jones Beach, it's a similar scene, with much of the coast now sitting under water.

MyPics: Hurricane Irene on Long Island

State Park officials: Barrier beaches at risk because of IreneLong Island coastline expected to take beating