The Lewis and Clark Expedition started at St. Louis and went up the Missouri River. When could not follow the river further, they bargained with the Native Americans for horses and crossed the Continental Divide. Then they followed the Snake River to the Pacific Ocean.
Actually, 4. The Columbia, Snake, and Clearwater.
Missouri River
they took the Missouri River, struggled across the Continental Divide at Lemhi Pass, and headed west along the Salmon
Missouri
Louis and Clark reached the Pacific ocean in 1805.
The Pacific Ocean
They were trying to find the Northwest passage to the Pacific.
Pacific ocean
Lewis and Clark reached the Pacific Ocean on November 5, 1805. The explorers began their journey home on March 23, 1806. On July 3, after crossing the Continental Divide, the Corps split into two teams so Lewis could explore the Marias River. Lewis and Clark stayed separated until they reached the confluence of the Yellowstone and Missouri Rivers on August 11. Once reunited, the Corps was able to return home quickly via the Missouri River. They reached St. Louis on September 23, 1806.
No they where sent up the Mississippi to find a passage way to the pacific ocean
Louis and Clark hope this helps
Lewis and Clark set out to explore the Louisiana Purchase in 1803 and came back in 1806 this is called the Louis and Clark Expedition.
They didn't. They explored the Lousiana Purchase. Headed west from St. Louis to the Pacific Coast.
They found out what was in the area, that there was no route to the Pacific, and opened the land for settlements and eventually statehood.
It was 7,689 miles the entire trip, so from St. Louis to the Pacific was just around half of that, 3,884 miles.
St Louis, Missouri was the starting point and the Pacific Ocean in Oregon was the final stop.