On this day in Lewis & Clark history...
The boats pass through a narrow channel avoiding a dangerous whirlpool near Tower Rock. Lewis describes the view from the top of the Sugar Loaf as beautiful and commanding. They camp west southwest from present Jacob, Illinois.
From the journals...
On the W. side and about 25 feet up this rock is a small cavern— the rock is limestone & the same quality of the clifts heretofore discribed (i e) intermixed with a considerable portion of Flint stone. When the river is high the courent setts in with great violence on the W. side of this rock and being confined on that by a range of high hills is drven with much impetuosity through a narrow channel
Grand Tower and Devil's Bake Oven
Sketch by Karl Bodmer circa 1833.