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    A timeline of Portsmouth bridges

    Spanning the decades

    1794 First bridge across the Piscataqua opens at Newington, N.H.

    1822 First bridge from Portsmouth, N.H., to Kittery, Maine, opens near current site of Sarah Mildred Long Bridge

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    1844 Railroad bridge opens at same site

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    1923 Memorial Bridge opens in January

    1938 Railroad bridge collapses, killing two members of train crew

    1940 N.H.-Maine Interstate Bridge opens, renamed for Long in 1987

    1972 I-95 “high-level” or “high-span” bridge opens

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    2011 Memorial Bridge closed to traffic

    2012 Memorial Bridge demolished

    2013 New Memorial Bridge to open

    SOURCES: Discover Portsmouth and Richard Candee