Editing Mandan, North Dakota (section)

===Transportation development===
In the earliest days of Euro-American settlement, the main commercial transportation route was the Missouri River. Even after the rail arrived in the 1870s, the river remained the main north–south route until the mid-1930s' development of the national highway system. Steamboats used coal for fuel and the mine at Sims seven miles west of Mandan was a major source of lignite coal. If unavailable, steamboat crews bought wood from farmers along the river. Bellows Landing, the site of today's R M Hesket Power Station, was a refueling station with an icehouse. Historical records indicate it served steamboat traffic as early as 1832 when the riverboat Yellowstone reached Fort Union. Regular steamboat service on the Missouri began in 1860. Bellows Landing was renamed Rock Haven when the US government took over the operation in the late 1870s. The Army Corps of Engineers made extensive riverside improvements, including adding dry-dock and boat repair facilities. It supported the supply ships for the US Army's frontier forts and was considered the best landing on the river. Unlike most river harbors, the area was permanent and safe even during spring river ice breakup. It ceased operations in 1934.<ref>{{cite web|url = http://mandanhistory.org/goneforever/rockhaven.html|title = Rockhaven Harbor|website = Mandan Historical Society|access-date = July 14, 2018}}</ref>