On this day in Lewis & Clark history...
The Expedition splits into two parties. Because of his inflamed ankle, Clark remains with the canoes and camps near Beaverhead rock, a landmark named by the Indians. Lewis is further ahead near present Dillon, Montana.
From the journals...
Friday August 9th 1805.
I directed my course across the bottom to the Stard. plain led left the beaver's head about 2 miles to my left and interscepted the river about 8 miles from the point at which I had left it; I then waded it and continued my rout to the point where I could observe that entered the mountain, but not being able to reach that place, changed no direction to the river which I struck some miles below the mountain and encamped for the evening having traveled 16 M.
Beaverhead Rock

Friday 9th August 1805.
the River and Smooth prarie the Same as yesterday.
Beaverhead River
