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.

Actors recreate the scene every year.

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

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