Hiram Martin Chittenden was an American engineer and historian. A graduate of West Point, he was the Seattle district engineer for the Army Corps of Engineers from 1906 to 1908). Chittenden was one of the first three elected Port Commissioners at the Port of Seattle. He also helped found the Pacific Coast Association of Port Authorities, later known as the Association of Pacific Ports in 1913. The Hiram M. Chittenden Locks in Seattle are named in his honor.

Joseph Marie LaBarge was an American steamboat captain, most notably of the steamboats Yellowstone, and Emilie, that saw service on the Mississippi and Missouri rivers, bringing fur traders, miners, goods and supplies up and down these rivers to their destinations. During much of his career LaBarge was in the employ of the American Fur Company, a giant in the fur trading business, before building his own steamboat, the Emilie, to become an independent riverman. During his career he exceeded several existing speed and distance records for steamboats on the Missouri River. Passengers aboard his vessels sometimes included notable people, including Abraham Lincoln. LaBarge routinely offered his steamboat services gratis to Jesuit missionaries throughout his career.