Sand Products Corporation

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Sand Products Corporation (SPC) is a sand and gravel supplier based in Muskegon, Michigan.^[1] The company was founded on January 2, 1930, by brothers Mark and Max McKee as a company that mined and processed industrial sands. In the early 1930s, SPC began operating a large commercial dock in Muskegon, Michigan, dubbed the Mart Dock, handling a wide variety of cargoes and became deeply involved in the Great Lakes shipping industry and vessel ownership through a series of wholly owned subsidiaries and partnerships.^[2]

SPC purchased the decommissioned tank landing ship, USS LST 393 as war surplus in 1948. She would operate as a car transit vessel under named Highway 16 for many years. Today she's a museum ship located near SPC's offices.^[3][4]

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