From the record
“Fort Atkinson was the first United States Army post to be established west of the Missouri River in the unorganized region of the Louisiana Purchase of the United States. Located just east of present-day Fort Calhoun, Nebraska, the fort was erected in 1819 and abandoned in 1827.”
Wikipedia article Fort Atkinson (Nebraska), CC BY-SA 4.0.
One of 14 National Register listings published here for Washington County · listed in 1966 · category: Site · built in 1971 · a National Historic Landmark.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service


