From the record
“The Snake River Trading Post is a reconstructed fur trade post on the Snake River west of Pine City, Minnesota, United States. The post was established in the fall of 1804 by John Sayer, a partner in the North West Company, and built by his crew of voyageurs.”
Wikipedia article Snake River Trading Post, CC BY-SA 4.0.
One of 22 National Register listings published here for Pine County · listed in 1972 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service