High tides teamed up with a vicious nor'easter to cause major beach erosion at Robert Moses State Park.

Sand dunes that once gradually sloped downward to the beach at Field 4 have been turned into 8-foot sand cliffs. As a result, covered metal spikes used to hold up the sand dunes are now fully exposed.

"Unfortunately, we had the moon tide, we had the high tide, we had the storm tides and we had the storm surges," said NYS Parks Department Regional Director George Gorman. Gorman said the storm surges "really cut into the dunes and a lot of state park beaches."

A year's worth of sand has been eroded in the past two days, about two-thirds of which was buildup experienced during the mild winter, Gorman said.

Water levels continued to be high throughout Monday evening, meaning additional erosion is a possibility.

For extended footage of storm coverage around Long Island, go to channel 612 on your iO digital cable box and select iO Extra.