Two days into the L & C Expedition Lewis decided to "explore" a historical cave that was used by Indians and French settlers in the early 1700's.
Getting there is a 2 mile hike down a RR track...past No Trespassing signs.
Sight of the rock/cave at the top of the treeline...it is quite high. To get a view of the area Lewis climbed to the top of the rock, slipped and fell down the side of the cliff...(as the rest of the Expedition members watched from their boats) certainly to his death (on the second day of the expedition)... but, though he was carrying a rifle and Bowie knife, he caught himself sliding down the cliff by stabbing his knife into the side of the rocks on the cliff. Clark later chastised Lewis for his reckless attempt, but they both laughed it off as immaturity. Lewis paid with some missing skin and bruises.
Note the red arrow indicating where Lewis fell from (according to his and Clark's journals (diaries). The cave entrance is about 50 feet below the red arrow.
Cave Entrance. After seeing what NOT TO DO, Clark arrived later in the day and wrote that he marked the cave with "his name and the date" on a rock inside the cave. His signature has not been found but no doubt it is there.
Would not recommend climbing to the top without the right gear, plus snakes and black bear are prevalent. Saw bear poop all up and down the RR tracks.