Lewis & Clark Trail State Park, State park in Columbia County, United States.

Lewis & Clark Trail State Park covers 36 acres (15 ha) on the Touchet River in Columbia County, with old-growth forest and 1,333 feet (406 m) of river shoreline. The park provides camping, hiking, fishing, swimming, birdwatching, interpretive activities, wildlife viewing and athletic fields.

The park was established by the Washington State Parks and Recreation Commission to protect the natural landscape along this important historic waterway. This area served as a key passage for early explorers and travelers crossing the region.

The park sits along the historic route traveled by the Lewis and Clark Expedition, with interpretive signs showing the importance of this passage for early regional exploration. Visitors can connect to the region's past through the natural landscape that travelers once saw centuries ago.

The park welcomes visitors from spring through fall, with basic amenities including restrooms and designated fire pits throughout the grounds. Winter closures run from November through March to protect the landscape.

The park covers 36 acres and holds old-growth forest, a rare remnant in this wheat-growing valley. It also has 1,333 feet of Touchet River shoreline, and the land rises to 418 metres, with a 581-metre hill about a kilometre to the northeast. Dayton lies 8.6 km away.