Trail Creek Pass (Idaho)
September 2nd Monday 1805
"...we...proceded on thro' thickets in which we were obliged to Cut a road, over rockey hill Sides where our horses were in pitial [perpetual or potential] danger of Slipping to Ther certain distruction & up & Down Steep hills, where Several horses fell, Some turned over, and others Sliped down Steep hill Sides, one horse Crippeled & 2 gave out."
William Clark
The above quote is taken directly from the Gary Moulton, University of Nebraska version of the Lewis and Clark Journals.
