Lewis and Clark National Historical Park near Astoria, Oregon, spans sites in Oregon and Washington at the mouth of the Columbia River and centers on Fort Clatsop, where the Corps of Discovery spent the winter of 1805 to 1806 after reaching the Pacific. Expanded from Fort Clatsop National Memorial into a multi-site historical park in 2004, it includes places tied to the expedition’s final coastal months, such as Netul Landing, the Salt Works, Station Camp, Middle Village, Clark’s Dismal Nitch, and the Fort to Sea Trail. Related state park landscapes deepen the story of exploration, survival, and the contested lower Columbia.