State Historical Society of North Dakota State Historical Society of North Dakota The State Historical Society of North Dakota is an agency that preserves and presents history through museums and historic sites in the state of North Dakota. The agency operates the North Dakota Heritage Center in Bismarck, which serves as a history museum for the state, oversees the preservation of the state's historic places, and presents the history of the state to the public in exhibits and branch museums. The Society also operates the Former North Dakota Executive Mansion in Bismarck. Headquartered in Bismarck, the State Historical Society consists of one governing board of appointees
South Dakota Highway 15 South Dakota Highway 15 South Dakota Highway 15 (SD 15) is a state highway in the northeastern part of the U.S. state of South Dakota. It connects Clear Lake, Milbank, and Wilmot. SD 15 originally traveled from the Nebraska state line to the North Dakota state line. It followed what would eventually become U.S. Route 77 (US 77), which had been designated before 1931. Part of its path went north from Wilmot to Sisseton, then north to Hammer, along US 81's former path, west to Claire City, north to the North Dakota state line north of Claire City, where it