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

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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
Fri 12:47am    -1.54 knots Max Ebb
Fri 02:56am    Moonset
Fri 04:52am    0.00 knots Slack, Flood Begins
Fri 05:08am    Sunrise
Fri 06:27am    0.74 knots Max Flood
Fri 10:24am    -0.00 knots Slack, Ebb Begins
Fri 01:01pm    -1.57 knots Max Ebb
Fri 04:12pm    Moonrise
Fri 05:00pm    0.00 knots Slack, Flood Begins
Fri 06:52pm    1.04 knots Max Flood
Fri 08:12pm    Sunset
Fri 10:57pm    -0.00 knots Slack, Ebb Begins
Sat 01:36am    -1.66 knots Max Ebb
Sat 03:26am    Moonset
Sat 05:07am    Sunrise
Sat 05:40am    0.00 knots Slack, Flood Begins
Sat 07:18am    0.81 knots Max Flood
Sat 11:13am    -0.00 knots Slack, Ebb Begins
Sat 01:49pm    -1.61 knots Max Ebb
Sat 05:12pm    Moonrise
Sat 05:44pm    0.00 knots Slack, Flood Begins
Sat 07:40pm    1.14 knots Max Flood
Sat 08:13pm    Sunset
Sat 11:41pm    -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.