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.
Piscataqua River Currents|
Thu 02:17am -2.14 knots Max Ebb
Thu 03:56am Moonset
Thu 05:11am Sunrise
Thu 06:13am 0.00 knots Slack, Flood Begins
Thu 08:10am 1.31 knots Max Flood
Thu 11:45am -0.00 knots Slack, Ebb Begins
Thu 02:36pm -2.04 knots Max Ebb
Thu 06:18pm 0.00 knots Slack, Flood Begins
Thu 06:33pm Moonrise
Thu 08:07pm Sunset
Thu 08:33pm 1.68 knots Max Flood
Fri 12:13am -0.00 knots Slack, Ebb Begins
Fri 03:08am -2.33 knots Max Ebb
Fri 04:41am Moonset
Fri 05:11am Sunrise
Fri 07:02am 0.00 knots Slack, Flood Begins
Fri 09:03am 1.45 knots Max Flood
Fri 12:38pm -0.00 knots Slack, Ebb Begins
Fri 03:27pm -2.14 knots Max Ebb
Fri 07:07pm 0.00 knots Slack, Flood Begins
Fri 07:46pm Moonrise
Fri 08:08pm Sunset
Fri 09:24pm 1.79 knots Max Flood
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.
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.
Currents. The swift currents of the Piscataqua River make Portsmouth Harbor one of the fastest flowing commercial port waterways in the northeastern United States. The ice-free deep-water channel has been used for shipping since the 1600s.
What kind of name is Piscataqua (pis-cat-a-qua)? 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.