- 1585 Trident Road, Three Forks MT
- National Historic Landmark
- OPEN TO PUBLIC:
- MANAGED BY:
- Montana State Parks
Three Forks of the Missouri is a High Potential Historic Site on the Lewis and Clark National Historic Trail.
On July 25, 1805, the expedition finally reached the headwaters of the Missouri River. It was here that Sacagawea had previously been kidnapped by the Hidatsa during a raid on a Shoshone camp. Clark, who led a scouting party ahead of the main body, wrote, “we proceeded on a fiew miles to the three forks of the Missouri those three forks are nearly of a Size, the North fork [Jefferson River] appears to have the most water and must be Considered as the one best calculated for us to assend middle fork [Madison River] is quit as large about 90 yds. wide. The South fork [Gallatin River] is about 70 yds wide & falls in about 400 yards below the midle fork. those forks appear to be verry rapid & Contain Some timber in their bottoms which is verry extincive.” Lewis arrived two days later and wrote, “beleiving this to be an essential point in the geography of this western part of the Continent I determined to remain at all events untill I obtained the necessary data for fixing it’s latitude Longitude &c.” They spent several days exploring the area and making observations while the company hunted, rested, and refitted. Initially uncertain, Lewis and Clark determined the Jefferson River their best route forward in anticipation of meeting the Shoshone and gaining their assistance. Clark camped at the forks again on July 13-14, 1806, while enroute to the Yellowstone River valley during the return journey.
The confluences of the Three Forks of the Missouri join along the boundary between Broadwater and Gallatin counties, about three miles northeast of the town of Three Forks and within the Missouri Headwaters State Park.