PHILADELPHIA (CBS) — An annual reenactment of the famous “Washington’s Crossing” might have to be called off this year.

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On Christmas Day in 1776, George Washington led troops across the Delaware River from Yardley, Pennsylvania into Trenton, New Jersey.

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Actors recreate the scene every year.

But this year, low water levels in the Delaware River could make the trip impossible.

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A significant amount of rain will have to fall for the show to go on.