"...we came to a most beautiful warm spring..."
13 September 1805
The expedition stopped at Lolo Hot Springs on both legs of the journey. Local tribes had used the site for centuries, and it was also a valuable source of water for wildlife as Clark observed on September 13, 1805:
"These seem to be much frequented, as there are several paths made by elk, deer, and other animals, near one of the springs a hole or Indian bath, and roads leading in different directions. These embarrassed our guide, who, mistaking the road, took us three miles out of the proper course, over an exceedingly bad route."
"in this bath which had been prepared by the Indians by stopping the river with Stone and mud, I bathed and remained in 10 minits…"
In his June 29, 1806, journal entry, Clark expanded on the experience:
"both the Men and the indians amused themselves with the use of the bath this evening. I observe after the indians remaining in the bath as long as they could bear it run and plunge themselves into the creek the water of which is now as cold as ice can make it; after remaining here a few minits they return again to the worm bath repeeting the transision several times but always ending in the worm bath."
William Clark suggested the name Boyles Springs, but the first Lolo post office was registered as Lolo Hot Springs and the name endured.