Portsmouth (NH) Harbor – 43.1°N, 70.8°W
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From Ceres Street, Portsmouth, N.H., looking northeast over the Piscataqua River toward Maine. |
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River traffic. The Piscataqua River is a swift tidal river. When the tide comes in (right to left <--- above), it reverses the river's normal flow. Travel by tankers and other large vessels is restricted to slack tide, when the current is more or less zero. See the chart below for slack tide times at the entrance to Portsmouth Harbor (map), which is roughly three miles downstream. | |
Piscataqua River Currents | Current Conditions 21.6 oF
clear 
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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. | |
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Points of Interest |
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What kind of name is Piscataqua (Piss-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. | |
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