We know much detail of the 1805 trip from the mouth of the Marias and portage of the Great Falls because the two Captains kept detailed records. We know only scanty information of the 1806 reportage because the only journalists were two sgts who gave us minimal detail. We can not determine the locations of the campsites they used much of the time, including where Gass and Willard camped on the Teton 7/27/06 except to surmise that the information points us to the same location and say it was near where Clark--and Gass--had camped the year before.
The main indicators we have from Clark are his distances and compass directions that put him on the Teton at the "notch" in the ridge where the river turns north. He then says they proceeded a few miles and camped. The next day they struggled over hills etc., (and took time to shoot and skin seven deer) and made it back to their main camp on the Marias by 5 pm.
Clark's and Gass' journal entries for 6/5/05 conflict on distances. The reader can't really be sure just what relevance "the ridge where the little river breaks thro" plays. Did they camp there or reach the river there?
Us "Lewis and Clarkers" want great detail about the Expedition and the journals deliver, most of the time. But sometimes we go wanting.