After the expedition had set-up camp, nearby tribal members came to visit in fair numbers, some staying all night. For several days, Lewis and Clark met in council with Mandan chiefs. Here they met a French-Canadian fur trapper named Toussaint Charbonneau, and his young Shoshone wife, Sacagawea. Charbonneau, at this time, began to serve as the expedition's translator. Peace was established between the expedition and the Mandan chiefs with the sharing of a Mandan ceremonial pipe.Clark & Edmonds, 1983 p. 12 By April 25, Captain Lewis wrote his progress report of the expedition's activities and observations of the Native American nations they had encountered to-date in A Statistical view of the Indian nations inhabiting the Territory of Louisiana, which outlined the names of various tribes, their locations, trading practices and water routes used, among other points. President Jefferson would later present this report to Congress.Allen, Lewis & Clark, Vol. 1, 1916 pp. 81–82 thumb|Lewis and Clark meeting the Salish at Ross Hole, September 4, 1805. They followed the Missouri to its headwaters, and over the Continental Divide at Lemhi Pass, then north to Traveler's Rest, and crossed the Bitteroots at Lolo Pass. They descended on foot, then proceeded in canoes down the Clearwater, Snake, and Columbia rivers, past Celilo Falls and present-day Portland, at the confluence of the Willamette and Columbia rivers. Lewis and Clark used William Robert Broughton's 1792 notes and maps to orient themselves once they reached the lower Columbia River. The sighting of Mount Hood and other stratovolcanos confirmed that the expedition had almost reached the Pacific Ocean.
After the expedition had set-up camp, nearby tribal members came to visit in fair numbers, some staying all night. For several days, Lewis and Clark met in council with Mandan chiefs. Here they met a French-Canadian fur trapper named Toussaint Charbonneau, and hi.s young Shoshone wife, Sacagawea. Charbonneau, at this time, began to serve as the expedition's translator. Peace was established between the expedition and the Mandan chiefs with the sharing of a Mandan ceremonial pipe.Clark & Edmonds, 1983 p. 12 By April 25, Captain Lewis wrote his progress report of the expedition's activities and observations of the Native American nations they had encountered to-date in A Sta.tistical view of the Indian nations inhabiting the Territory of Louisiana, which outlined the names of various tribes, their locations, trading practices and water routes used, among other points. President Jefferson would later present this report to Congress.Allen, Lewis & Clark, Vol 1, 1916 pp. 81–82 thumb|Lewis and Clark meeting the Salish at Ross Hole, September 4, 1805. They followed the Missouri to its headwaters, and over the Continental Divide at Lemhi Pass, then north to Traveler's Rest, and crossed the Bitteroots at Lolo Pass. They descended on foot, then proceeded in canoes down the Clearwater, Snake, and Columbia rivers, past Celilo Falls and present-day Portland at the confluence of the Willamette and Columbia rivers. Lewis and Clark used William Robert Broughton's 1792 notes and maps to orient themselves once they reached the lower Columbia River. The sighting of Mount Hood and other stratovolcanos confirmed that the expedition had almost reached the Pacific Ocean