Between August 31 and September 4, 1805, the Corps of Discovery struggled through the steep, formidable mountains at Lost Trail Pass despite having Toby as a guide. Captain Clark wrote on September 3, 1805, that the hills were high and rocky on each side, the mountains closed the creek on each side, and the party was forced onto slopes so steep that horses could scarcely keep from slipping, with several slipping and injuring themselves badly; with great difficulty they made eight miles and encamped on a branch of the creek. Although journal descriptions make it easy to reconstruct most of the Lewis and Clark route, this section has long remained uncertain because neither the rugged countryside nor the journal entries clearly indicates the path they followed. Scholars and aficionados have widely disagreed over the exact route, and while there is some agreement about the probable campsites of September 2 and 4, the September 3 camp may not be identified unless datable metal or charcoal is found. In a 1997 workshop, five Lewis and Clark scholars presented their interpretations of what happened between September 1 and 4, 1805, and after reviewing routes and campsites and using journal accounts, mapping tools, and computer modeling, they agreed on the route south of the junction of the North and West Forks of the Salmon River and Moose Creek, but north of that point little consensus was reached.