<Table> <Tr> <Td> ⚈ The Fort Clatsop National Memorial located southwest of Astoria . </Td> </Tr> </Table> <Tr> <Td> ⚈ The Fort Clatsop National Memorial located southwest of Astoria . </Td> </Tr> <P> Fort Clatsop was the encampment of the Lewis and Clark Expedition in the Oregon Country near the mouth of the Columbia River during the winter of 1805 - 1806 . Located along the Lewis and Clark River at the north end of the Clatsop Plains approximately 5 miles (8.0 km) southwest of Astoria, the fort was the last encampment of the Corps of Discovery, before embarking on their return trip east to St. Louis . </P> <P> The Lewis and Clark Expedition wintered at Fort Clatsop before returning east to St. Louis in the spring of 1806 . It took just over 3 weeks for the Expedition to build the fort, and it served as their camp from December 8, 1805 until their departure on March 23, 1806 . </P>

Who spent the winter of 1805 with the corps of discovery