Lewis and Clark State Park is a 525-acre recreation area on Lake Sakakawea in northwestern North Dakota, where Gamache Creek enters the reservoir east of Williston. Named for Meriwether Lewis and William Clark, it stands near a campsite used by the Corps of Discovery on April 17, 1805, during their transcontinental expedition. The park’s modern development began when the North Dakota legislature authorized leasing land from the U.S. Army Corps of Engineers in 1971, and it was established in 1973 as one of several new state parks on the lake. Today it serves as a lakeside center for fishing, boating, camping, swimming, hiking, and mountain biking.