Floyd, who was the quartermaster for the Lewis and Clark Expedition's Corps of Discovery, was the only fatality during the expedition. The bluff was Floyd's original burial site in 1804, and is now the location of a National Historic Landmark in his honor. The Floyd Monument is located above the east bank of the Missouri River, just downstream from the mouth of the Floyd River. The bluff itself is part of the Loess Hills formation.
The Floyd's Bluff area was settled in 1848 by William Thompson, a recent veteran of the Mexican-American War. He established a trading post, and registered the name "Floyd's Bluff" as the name for his city, which never materialized. Instead, settlers upriver between the mouths of the Floyd and Big Sioux rivers were successful in establishing and incorporating Sioux City in the 1850s. Floyd's Bluff later became part of Sioux City with the development of the suburb of Morningside in the 1870s.t
- Lewis and Clark History
- George Catlin's 1832 painting of Floyd's Bluff
- Floyd's Bluff
- William Thompson and Floyd's Bluff
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