It’s possible traffic could be an issue near the Tappan Zee Bridge. Friday is the first of about 70 closures due to construction of the new bridge.

The first full closure of the main navigational channel at the Tappan Zee Bridge is scheduled for Friday from 6 a.m. until 4:30 p.m. Boaters are strongly advised to avoid the site.

“While some boaters may experience a temporary inconvenience during the channel closures, staying away makes the project site safer for everyone,” NNYB Project Director Jamey Barbas stated in a press release. “We thank boaters for their understanding and patience as we continue to build a world-class bridge.”

About 70 closures are expected through the end of 2017. Officials say the closures are necessary as project crews install new sections of structural steel and road deck panels between the towers of the new crossing.

Times and dates of the closures will appear in the U.S. Coast Guard’s weekly Notice to Mariners, on the New NY Bridge (NNYB) project’s twitter feed, @NewNYBridge, and broadcast on Marine Radio Channel 22A.