Portsmouth (NH) Harbor – 43.1°N, 70.8°W

18.9 oF   mostly clear    forecast      image scheduled to reload every 8 seconds;actual time varies      tides     send email

Ceres Street, Portsmouth, N.H., looking northeast over the Piscataqua River toward Kittery, Maine.
Latitude: 43.07905408740087
Longitude: -70.75766086578369

River traffic. Piscataqua River currents restrict travel by tankers and other large vessels to slack tide, roughly four hours a day. See chart below for slack tide at the entrance to Portsmouth Harbor. The entrance is nearly three miles from the location of the PortsmouthNH.com's HarborCam. Slack tide at the Harbor Cam is roughly a half hour later. A schedule of shipping in the Piscataqua is not available.

Currents. The swift currents of the Piscataqua River make it among he fastest flowing tidal waterways in the Continental United States (NOAA list of 50 fastest in North America; look for "Nobles Island, north of"). The ice-free deep-water channel has been used for shipping since the 1600s.

Piscataqua River Currents
Sat 12:31am    EST -1.55 knots Max Ebb
Sat 04:01am    EST 0.00 knots Slack, Flood Begins
Sat 04:18am    EST Moonset
Sat 06:01am    EST 0.99 knots Max Flood
Sat 06:56am    EST 0.96 knots Min Flood
Sat 06:59am    EST Sunrise
Sat 08:04am    EST 1.01 knots Max Flood
Sat 10:00am    EST -0.00 knots Slack, Ebb Begins
Sat 01:45pm    EST -1.83 knots Max Ebb
Sat 02:15pm    EST Moonrise
Sat 04:48pm    EST 0.00 knots Slack, Flood Begins
Sat 04:53pm    EST Sunset
Sat 08:44pm    EST 0.94 knots Max Flood
Sat 10:29pm    EST -0.00 knots Slack, Ebb Begins
Sun 01:50am    EST -1.55 knots Max Ebb
Sun 04:53am    EST 0.00 knots Slack, Flood Begins
Sun 05:04am    EST Moonset
Sun 06:55am    EST 0.99 knots Max Flood
Sun 06:58am    EST Sunrise
Sun 07:42am    EST 0.97 knots Min Flood
Sun 08:55am    EST 1.03 knots Max Flood
Sun 10:50am    EST -0.00 knots Slack, Ebb Begins
Sun 02:33pm    EST -1.88 knots Max Ebb
Sun 03:09pm    EST Moonrise
Sun 04:54pm    EST Sunset
Sun 05:38pm    EST 0.00 knots Slack, Flood Begins
Sun 09:32pm    EST 0.97 knots Max Flood
Sun 11:20pm    EST -0.00 knots Slack, Ebb Begins

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About the Piscataqua River. This Piscataqua River is a 13-mile long tidal estuary formed by merging of the Salmon and Cocheco rivers. The river, which separates Maine and New Hampshire, also drains Great Bay, a National Estuarine Research Reserve site. The last 8.8 miles of the Piscataqua River constitute Portsmouth Harbor, which stretches across New Castle, Portsmouth, and Newington, and the Maine communities of Kittery and Eliot.


New Hampshire-Maine border. The N.H.-Maine border lies in the middle of the Piscataqua River. Its exact location was the subject of a long-running dispute settled by the U.S. Supreme Court.

Points of Interest Portsmouth Harbor

Points of Interest
1. Moran Towing tugboats
2. Public benches
3. Ferry Landing restaurant
4. Tug Alley Too tugboat
5. Memorial Bridge
6. Portsmouth Naval Shipyard
7. Badger's Island, Kittery, Maine

What kind of name is Piscataqua (piss-cat-a-qwa)? Easy for you to say, but not so easy to spell. See an extended examination of the origin of the word at SeacoastNH.com and 20 ways to spell Piscataqua.

More information. For more about the Piscataqua River, see the Army Corps of Engineers Water Resources web page.