Four steam, sternwheel towboats were built by Dubuque Boat & Boiler Company for the Upper Mississippi Barge Line, and in turn leased to the Inland Waterways Corporation (IWC). The first three of these boats were built in 1927, with the initial boat being the S.S. Thorpe, named for Samuel S. Thorpe, a Minneapolis Realtor, founder of the National Association of Realtors and first chairman of the Upper Mississippi Barge Line Company (UMBLC). The se…
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