On I-90 at the town of Three Forks, MT is the Missouri Headwaters SP. Where the Jefferson, Madison and the Gallatin Rivers join in a distance of about 100 yards to form the Missouri River.
For a little more background- One of the things that President Jefferson charged L and C with was to determine the location of and map the head waters of the Missouri River! About 30 miles S/W of Dillon, MT at the top of Lemhi Pass on the continental divide separating Idaho and Montana is the Home of Lemhi Pass National Historical Landmark. There is a spring with a brass Department of the Interior Plaque attached to a rock that states that that spring was named the “Most distant fountain of the mighty Missouri River” by L&C! Interesting? Who is correct? We have been to both locations!
As a side note about 1/2 way between Dillon and Lemhi Pass is Bannack State Park (first territorial Capital of MT) this is a TRUE ghost town not restored etc. about 50 of the original buildings are still standing! This is also the town that elected Henry Plummer as sheriff of Bannack however, unknown to them he was a convicted felon from the state of California! The plot thickens!
Goggle- Bannack State Park, MT
Henry Plummer, Sheriff, Bannack, MT
Bannack Historical Lodge 3-7-77 (explains the legend of the numbers 3-7-77)
There is hours and hours of reading about Bannack and Virginia City, Mt and the formation of the vigilantes! What else do you do when the Sheriff is a convicted felon?