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    Merrimack River - Wikipedia

    • The Merrimack River (or Merrimac River, an occasional earlier spelling ) is a 117-mile-long (188 km) river in the northeastern United States. It rises at the confluence of the Pemigewasset and Winnipesaukee rivers in Franklin, New Hampshire, flows southward into Massachusetts, and then flows northeast until it empties into the Gulf of Maine at Newburyport. F… See more

    Etymology and spelling

    The etymology of the name of the Merrimack River—from which all subsequent uses derive, such as the name of the Civil War ironclad—remains uncertain.
    There is so… See more

    History

    Prior to glaciation, the Merrimack continued its southward course far beyond the present day New Hampshire-Massachusetts border to enter the Gulf of Maine near Boston. Upon the glacier's retreat, deb… See more

    CountryUnited States
    StateNew Hampshire · Massachusetts
    RegionNew England
    CitiesConcord, NH, Manchester, NH, Nashua, NH, Lowell, MA, Lawrence, MA, Haverhill, MA, Newburyport, MA
    Geography

    The Merrimack River watershed covers 5,010 square miles (12,980 km ) in southern New Hampshire and northeastern Massachusetts. It is the fourth largest river basin in New England.
    The river b… See more

    River pollution and restoration

    Since 1951, the Merrimack River has seen many alterations and pollutants. It was dammed and canalled, as well as used as a dumping spot for industrial waste. The Merrimack was essential for textile mill complexes… See more

    Navigation

    The Merrimack is listed as one of the Navigable Waters of the United States, subject to Section 10, Rivers and Harbors Act Jurisdiction. See more

    May 2006 flooding

    While the Merrimack River is prone to minor flooding, on May 15, 2006, rainfall raised the river more than 8 feet (2.4 m) above flood stage, forcing evacuations, damaging property, and breaking the main sewage pip… See more

    Other flooding events

    The most significant flood in the recorded history of the Merrimack was in March 1936, when a double flood of rain and melting snow and ice swelled the Merrimack at Lowell to 68.4 feet (20.8 m), 10 feet (3 … See more

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    Table of Contents
    Etymology and spelling
    History
    Quick Facts
    Geography
    River pollution and restoration
    Navigation
    May 2006 flooding
     
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