Sacajawea Historical State Park

Located at the confluence of the Snake River and Columbia River, Sacajawea State Park is a day-use park with freshwater activities and grassy areas for picnics. Boating is most popular, there are two boat ramps and 200 feet of dock. One Northwest Discovery Water Trail campsite is available on first-come, first-served basis for paddlers traveling down the river. Other amenities are a children's playground, a swimming beach, fishing piers, volleyball, horseshoes, one kitchen shelter with electricity and a large barbecue grill and one without electricity, plus seven sheltered and 123 unsheltered picnic tables. One of the shelters can accommodate up to 200 people. Unique to the park is the Sacajawea Interpretive Center, where visitors can learn about the story of the Lewis and Clark expedition through the experiences of Sacagawea, the young Shoshone Indian woman who accompanied the expedition.

The property was deeded to Washington State Parks in 1931. The park is named for Sacajawea, a Shoshone Indian woman who traveled with the Lewis and Clark expedition. The park is located on one of the expedition's campsites, used by Lewis and Clark from October 16 to 18, 1805. Upon arriving here, the men wrote in amazement of the uncountable number of salmon. At that time, an estimated 16 million salmon filled these waters every year in a journey of 325 miles from the Pacific Ocean. The railroad built the town of Ainsworth in 1879. By 1884, the town was no longer used, and the buildings were moved or destroyed as local construction of the railroad was completed and the crew moved on.