Lewis and Clark State Park, State park on the shores of Blue Lake in Monona County, United States

Lewis and Clark State Park is a 176-acre (71 ha) Iowa state park in Monona County, set beside 250-acre (100 ha) Blue Lake. It holds 95 electric campsites and a full-size replica of the keelboat type used by the Lewis and Clark Expedition. The park lies about 6 km west of Onawa, and Blackbird Hill rises 11.6 km to the east.

The Lewis and Clark Expedition passed through this stretch of the Missouri River in 1804 on its way upstream; the park's replica keelboat recalls the type of vessel the party used. The park itself was later established as an Iowa state park in Monona County, and its 176 acres are centred on Blue Lake.

The park's name honors Meriwether Lewis and William Clark, whose expedition stopped in this area in 1804 while traveling up the Missouri River. A full-size replica of the keelboat type they used stands in the park, and the 250-acre Blue Lake is used for boating, swimming and fishing.

The park provides camping spots with electric hookups, shower facilities, and picnic areas with tables and grills spread throughout the grounds. Most trails and visitor areas are well maintained and easy to navigate for people of varying abilities.

The park holds a full-size replica of the keelboat type used by the Lewis and Clark Expedition, which passed this stretch of the Missouri River in 1804. Visitors can see the boat at Blue Lake, a 250-acre water body within the 176-acre park.