Jonathan Clark's diary
The Filson Historical Society's Special Collections includes the diary of William Clark's older brother Jonathan. The diary notes the departure and return of the captains from and to the Falls of the Ohio as well as William's move to St. Louis in June 1808. The entry for 26 October 1803 reads:
(Benjamin Temple was Jonathan's son-in-law who had a farm along the Ohio River in the area of present Lake Dreamland neighborhood in western Louisville.)
The 5 November 1806 entry states:
This is one of the few sources that state the date of Lewis and Clark's return to the Falls.
A 2 June 1808 entry notes: