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Mount Sinai Harbor Inlet

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Mount Sinai, New York United States
40° 57' 56.88'', -73° 2' 33.01''
Port Jefferson
Mount Sinai Harbor Inlet
Mount Sinai Harbor Inlet
Mount Sinai Harbor Inlet
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Local Notices to Mariners:

Local Notices to Mariners are available online from the U.S. Coast Guard.


Mount Sinai Harbor is located three miles west of Port Jefferson and is 16 miles to the southeast of Bridgeport, CT, across Long Island Sound. Mount Sinai was not always the relatively deep, well protected harbor it is today. A long time ago, there was little more than marsh and mud as far as the eye could see, but eventually the area was dredged to become what is now a first class stopover on Long Island’s North Shore.

In addition to the four marinas and large mooring field here, there is a fine sandy beach (Cedar Beach) that is popular with visitors on the Long Island side of the harbor’s edge. All the marinas and boatyards in Mount Sinai Harbor accept transient guests at their slips, and a large mooring field is available for those who’d rather sit on a mooring for the evening. There is limited anchorage at the east end of the harbor, but the holding is unreliable. If you anchor here, make doubly sure that your hook is set.

Navigating the Water:

Use NOAA Chart 12362.

From Long Island Sound, pick up red and white buoy “M” just north of the inlet to Mount Sinai Harbor. Two breakwaters border the east wand west sides of the inlet, and the outer ends are marked with a flashing red and flashing green light (unnumbered).

Once inside the breakwaters, the channel will shallow, and then you will begin to make a sharp turn to the east. As you move farther in, be aware of a small shoal that protrudes toward the channel from the Cedar Beach side of the channel, where depths shallow to two feet. Once you have completed the turn, a series of privately maintained aids to navigation (nun buoys) will lead up the harbor. Twelve to 13-foot depths skirt right up to the marinas on Cedar Beach and farther east toward the head of the harbor.

Mt. Sinai is East of Port Jefferson...In the introduction, it starts off with Mt. Sinai being 3 miles West of Port Jefferson Harbor.

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Wind Water & Waves Mount Sinai Harbor In response to Covid-19 pandemic operates on top priority to safety for the community. Only town residents are allowed in Purchasing pass in through online for safety All town workers are wearing masks and gloves. Harbor police are on site checking the waters. Mount Sinai F.D. On site for emergency. Towing available if you get stuck. Slips available 8-9,000 for the season you can also purchase weekly costing about $1,000. You can also trailer in and drop off the dock.... Bill the town Facility manager operates on first class service to the community the team Ryan, Chris and Mathew have all given a hand in securing the boat while parking truck and trailer. The environmental water check is done on site in preserving our fish. You ship off on the beautiful seashores of Mount Sinai Harbor being able to anchor down along the horizon coast and beach it take a drive to Middle Grounds viewing ancient 1716 lighthouse or travel straight over to Connecticut. Boating, tubing paddle boarding jet skiing you name it it’s here. Fishing is excellent fluke blue fish Some of the rarest blowfish caught right off the boat beautiful sunsets clean sparking waters crabbing lobster boats join the yacht club for some fancy first class fun. Restaurants Ralph’s Fishing store- Bait available For the perfect experience family or couple Over night camping.

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