The Steamship Authority announced Tuesday that its northernmost Woods Hole berth, slip number three, will be closed to ferries from Jan. 29 until Feb. 21.

Jay Cashman Inc., the boat line’s contractor for the sweeping terminal makeover, needs the slip to demobilize pile-driving equipment it has been using to reconstruct the middle of the three slips (number two) and add a passenger platform, the boat line said.

“Cashman has relocated its equipment so as to present no obstruction to vessels docking in slip one, the southernmost slip, during this time frame,” the SSA said.

Closing the third slip will result in the following schedule changes, according to the announcement:

Beginning Thursday, Jan. 30, the first scheduled trip for the freight ferry Katama will leave Vineyard Haven at 5:30 a.m., arriving in Woods Hole at 6:15 a.m.

The ferry Nantucket will add a 9:30 p.m. departure from Vineyard Haven on Fridays and Saturdays for the next two weekends: Jan. 30, Feb. 1, Feb. 7 and Feb. 8. 

“All scheduled trips on board the M/V Katama could be up to 10 minutes late due to slip availability,” the statement said. “We thank our customers for their patience during this period.”