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    Trelfa number 4-1504R

    Trelfa number 4-523

    Trelfa number 2-82-2

    Trelfa number 4-1519

    Trelfa number 4-124

    Richardson Dam, originally Oldfield Dam, across the Thunder Bay River near Tenth Street, Alpena, Michigan, c1908.

    Richardson Dam across the Thunder Bay River in Alpena, Michigan, c1910

    Match to Trelfa number 4-2061.

    Trelfa number 4-1990. Original image damaged - looks to be a peeling negative.

    In July of 1971, the Alpena Power Company lowered the Thunder Bay River by nine feet. This was done by opening the Ninth Street Dam and closing the Four-Mile Dam. The purpose of this was to allow the