Six barges and tugboats carrying construction equipment will begin arriving next week.
The president of Tappan Zee Constructors, Darrell Waters, says the barges will be among 50 to 60 that will arrive in coming months. At the peak of construction there will be 100 barges.
Waters told Rockland business executives "we're starting the mobilization of our fleet of equipment."
He says the barges will aid with soil sampling in the river. The work will become more evident once crews begin sinking piles by early summer.
By August, Waters says crews will begin dredging 900,000 cubic yards of sediment from the river. And by fall, one of the world's largest floating cranes will arrive.