15 October 1966
| July 19, 1964|
Bloom Site Wikipedia
Bloom Site is an archaeological site in Hanson County, South Dakota, near Bloom, South Dakota. It was declared a National Historic Landmark in 1964.
At the time of the designation in 1964, it was stated:
A well-preserved example of a prehistoric fortified Over Focus Indian site (c. 1000), the ancestors of the Mandan Indians may have lived here. About 25 depressions mark the locations of rectangular houses. Prior to their destruction by cultivation, some 50 burial mounds, ranging up to 200 feet in diameter and from 3 to 10 feet high, also marked the site.