The Fort Thompson Mounds are a complex of ancient

archaeological site An archaeological site is a place (or group of physical sites) in which evidence of past activity is preserved (either prehistoric or recorded history, historic or contemporary), and which has been, or may be, investigated using the discipline ...

s in Buffalo County, South Dakota, near Fort Thompson and within the

Crow Creek Reservation The Crow Creek Indian Reservation (, '), home to Crow Creek Sioux Tribe ( or Húŋkpathi Oyáte) is located in parts of Buffalo, Hughes, and Hyde counties on the east bank of the Missouri River in central South Dakota in the United States. ...

. Declared a

National Historic Landmark A National Historic Landmark (NHL) is a National Register of Historic Places property types, building, district, object, site, or structure that is officially recognized by the Federal government of the United States, United States government f ...

in 1964 by the US Department of Interior, the mound complex extends for a distance of about along the east bank of the

Missouri River The Missouri River is a river in the Central United States, Central and Mountain states, Mountain West regions of the United States. The nation's longest, it rises in the eastern Centennial Mountains of the Bitterroot Range of the Rocky Moun ...

. It is one of the largest known complex of burial mounds in the Plains region north of

Kansas Kansas ( ) is a landlocked U.S. state, state in the Midwestern United States, Midwestern region of the United States. It borders Nebraska to the north; Missouri to the east; Oklahoma to the south; and Colorado to the west. Kansas is named a ...

. One of the sites excavated in the 1950s was radiocarbon dated to c. 2450 BCE, showing nearly 5,000 years of indigenous human settlement. The mounds are believed to have been constructed in the Plains-Woodland period, beginning c. 800 CE.

Description

The Fort Thompson Mounds are a series of low earthen mounds, extending from the eastern (downstream) end of the Missouri River's Big Bend, downriver along the eastern bank, past Fort Thompson and the Big Bend Dam. They are generally located on a terrace above the river's bottomlands, roughly above the river's typical level in the early 1960s. All of these are believed to be burial mounds, which in some cases overlay older cultural materials. The mounds generally date from Plains-Woodland times (c. 800) and were found to contain evidence of the first pottery-making peoples in the area. The sites were known but not studied prior to the 1950s, when the

United States Army Corps of Engineers The United States Army Corps of Engineers (USACE) is the military engineering branch of the United States Army. A direct reporting unit (DRU), it has three primary mission areas: Engineer Regiment, military construction, and civil wo ...

began planning the construction of Big Bend Dam as part of a major flood control project of several dams on the Missouri River. Beginning in 1957, archaeologists engaged in a series of digs to understand the sites better, and to perform salvage archaeology on sites that were likely to be inundated by the waters the dam would impound. In addition to burials found in the mounds, features of habitation were also discovered. These include stone hearths, pottery fragments, and stone tools. One of the sites excavated gave radiocarbon dates of c. 2450 BCE.

References

{{National Register of Historic Places Mounds in the United States Native American history of South Dakota Archaeological sites on the National Register of Historic Places in South Dakota National Historic Landmarks in South Dakota Geography of Buffalo County, South Dakota National Register of Historic Places in Buffalo County, South Dakota Historic districts on the National Register of Historic Places in South Dakota

Description

See also

References