Falls marked the limit of the navigable section of the Missouri River, and the first steamboat arrived at the falls in 1859. In 1860, the Mullan Road linked Fort Benton with Fort Walla Walla in the Washington Territory. Politically, the Great Falls of the Missouri River passed through numerous hands in the 19th century. It was part of the unincorporated frontier until May 30, 1854, when Congress established the Nebraska Territory. Indian attacks on white explorers and settlers dropped significantly after Isaac Stevens negotiated the Treaty of Hellgate in 1855, and white settlement in the area began to occur. On March 2, 1861, it became part of the Dakota Territory. The Great Falls were incorporated into the Idaho Territory on March 4, 1863, and then into the Montana Territory on May 28, 1864. It became part of the state of Montana upon that territory's admission to statehood on November 8, 1889. The Great Falls of the Missouri River became the site of a permanent settlement in 1883. Businessman Paris Gibson visited the Great Falls in 1880, and was deeply impressed by the possibilities for building a major industrial city near the falls with power provided by hydroelectricity. He returned in 1883 with surveyors and platted a city (to be named Great Falls) on the south side of the river. The city's first citizen, Silas Beachley, arrived later that year. With investments from railroad owner James J. Hill and Helena businessman C. A. Broadwater, houses, a store, and a flour mill were established in 1884. A planing mill, lumber yard, bank, school, and newspaper were established in 1885. By 1887 the town had 1,200 citizens, and in October of that year the Great Northern Railway arrived in the city. Great Falls, Montana, was incorporated on November 28, 1888, Black Eagle Dam was built in 1890, and by 1912 Rainbow Dam and Volta Dam (now Ryan Dam) were all operating. The city of Great Falls, Montana, derives its name from the waterfalls. The small town of Black Eagle, Montana, derives its name from Black Eagle Falls, and Cascade County (in which both are located) is named for the cataracts and rapids which make up the falls. Dams Only one of the waterfalls that comprise the Great Falls of the Missouri River, Crooked Falls, exists in its natural state today. Dams built on the falls beginning in the 1880s have significantly altered and