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    Trelfa number 4-143

    "Richardson Dam, 1898"

    Alpena Power Company's Norway Point Dam (aka Seven Mile Dam) across the Thunder Bay River in Alpena County, Michigan during late construction. Built 1923-1924 as an electrical plant and to control Sp

    Aerial view from Potter Hill Farm (center lower left) to Four Mile Dam (upper left) along the Thunder Bay River and Long Rapids Road, Alpena County, Michigan

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

    From Centennial History of Alpena County, Michigan (1892/1903) by David D. Oliver, page 31: "The Trowbridge dam slacks the water up the river a short distance above the North Branch, and the perpendi

    From Centennial History of Alpena County, Michigan (1892/1903) by David D. Oliver, page 31: "The Trowbridge dam slacks the water up the river a short distance above the North Branch, and the perpendi

    Trelfa number 4-220

    Retention dam on Hubbard Lake in Alpena County, Michigan at the connection to the Thunder Bay River, c 1942.

    Alpena Power Company's Ninth Street Dam across the Thunder Bay River, Alpena, Michigan,

    Alpena Power Company's Ninth Street Dam Powerhouse (built 1909) across the Thunder Bay River, Alpena, Michigan.

    Seven Mile Dam (aka Norway Point Dam) across the Thunder Bay River in Alpena County, Michigan. The dam was built by the Alpena Power Company in 1923-24.

    Trelfa number 4-1989

    Trelfa number 4-2061

    This dam was later replaced by the Ninth Street Dam.

    Aerial view of the water mill at Oldfield Dam (also known as Richardson Dam) on the Thunder Bay River above Ninth Avenue.

    Above information from Wikipedia

    Above information from Wikipedia.

    Alpena Power Company's Ninth Street Dam and Powerhouse across the Thunder Bay River in Alpena, Michigan.

    Richardson Dam, originally Oldfield Dam, across the Thunder Bay River at Tenth Street in Alpena, Michigan.