Fort Henry (1)

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Fort Henry (1) (1810-1810) - Established in the spring of 1810 as a fur trading post by Andrew Henry, Pierre Menard and John Colter for the Missouri Fur Company and Manuel Lisa. Abandoned after a few months because of continuous attacks by hostile Blackfeet Indians. Also Known as Three Forks Post, Fort at Three Forks and Andrew Henry's Post.

Approximate location of Fort Henry and Three Forks Camp of Lewis & Clark. This Photo was taken at the Confluence of the Jefferson and Madison Rivers, just above where they join the Gallatin and become the Missouri River.


Built as a 300' square stockaded trading post. Among the traders killed at the fort were two former members of the Corps of Discovery, Drouillard and John Potts. John Colter was taken prisoner, stripped, and made to run for his life. He managed to escape and make his way back to Fort Raymond 250 miles away on bare feet.

Current Status

Some confusion exists over the naming of the forts created by Manuel Lisa and his company, exact locations are unknown for some of them and this has led to further confusion. The forts and their locations are detailed below:

Manuel Lisa's Fur Trading Posts
Primary Name Dates State Location AKA Names
Fort Manuel (1) 1812-1813 South Dakota Under Lake Oahe
  • None
Cedar Island Post 1811-18?? South Dakota Under Lake Francis Case
  • None
Fort Manuel Lisa (1) 1809-1813 North Dakota Under Garrison Dam project
Fort Raymond (1) 1810-1811 Montana
Fort Henry (1) 1810-1811 Montana 3 Forks
Fort Lisa (3) 1809, 1812-1823 Nebraska
Fort Henry (2) 1810-1811 Idaho Henry's fork of the Snake River

Location: Headwaters State Park, northeast of the town of
Three Forks, Gallatin County, Montana.

Maps & Images

Lat: 45.92532 Long: -111.50493

GPS Locations:



Fortification ID:

  • MT0082 - Fort Henry (1)
  • MT0196 - Three Forks Post
  • MT0194 - Fort at Three Forks
  • MT0087 - Andrew Henry's Post

Visited: 19 Aug 2016

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