<P> They followed the Missouri to its headwaters, and over the Continental Divide at Lemhi Pass . In canoes, they descended the mountains by the Clearwater River, the Snake River, and the Columbia River, past Celilo Falls, and past what is now Portland, Oregon, at the meeting 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 . </P> <P> The expedition sighted the Pacific Ocean for the first time on November 7, 1805, arriving two weeks later . The expedition faced its second bitter winter camped on the north side of the Columbia River, in a storm - wracked area . Lack of food was a major factor . The elk, the party's main source of food, had retreated from their usual haunts into the mountains, and the party was now too poor to purchase enough food from neighboring tribes . On November 24, 1805, the party voted to move their camp to the south side of the Columbia River near modern Astoria, Oregon . Sacagawea, and Clark's slave York, were both allowed to participate in the vote, so this may have been the first time in American history where a woman and a slave were allowed to vote . </P> <P> On the south side of the Columbia River, 2 miles (3 km) upstream on the west side of the Netul River (now Lewis and Clark River), they constructed Fort Clatsop . They did this not just for shelter and protection, but also to officially establish the American presence there, with the American flag flying over the fort . During the winter at Fort Clatsop, Lewis committed himself to writing . He filled many pages of his journals with valuable knowledge, mostly about botany, because of the abundant growth and forests that covered that part of the continent . The health of the men also became a problem, with many suffering from colds and influenza . </P> <P> Lewis was determined to remain at the fort until April 1, but was still anxious to move out at the earliest opportunity . By March 22, the stormy weather had subsided and the following morning, on March 23, 1806, the journey home began . The Corps began their journey homeward using canoes to ascend the Columbia River, and later by trekking over land . </P>

Where did the lewis and clark trail end
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