Statement of Significance (as of designation - July 17, 1991):
Here, in late March 1743, the Verendryes, the first Europeans to explore the northern plains region of the present United States, secreted a lead plate beneath a pile of stones. Sixty-one years before Lewis and Clark first arrived in this area, these French explorers, in search of a Northwest Passage to the Pacific, lay the basis for French sovereignty on the Upper Missouri, seeking to define the bounds of French Louisiana to include the entire Mississippi River drainage.
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