Spring 1820
A garrison/community located on the rich bottomlands along the south bank of the St. Peter's removed to an eminence on the west bank of the Mississippi, a mile from the old cantonment.
The regionGrade A · 1 independent source
The evidence
“They first located themselves on the rich bottomlands which extend along the south bank of the St. Peter's, but not finding it a healthy situation, removed in the spring of 1820, to an eminence on the west bank of the Mississippi, a mile distant from the old cantonement—a situation which is extremely pleasant and salubrious, and where they will remain until the permanent works are completed upon the bluff at the junction of the two rivers.”
1821-schoolcraft-narrative-journal/10-to-st-peters.md, PDF p. 318 / book p. 294
Schoolcraft, Henry R. Narrative Journal of Travels through the Northwestern Regions of the United States, Extending from Detroit through the Great Chain of American Lakes, to the Sources of the Mississippi River, Performed as a Member of the Expedition under Governor Cass, in the Year 1820. Albany: E. & E. Hosford, 1821. Library of Congress copy via the Internet Archive, archive.org/details/narrativejournal01scho.
Grade A: Found on a page of one of our sources