Missouri River.

30-05-03-26. Missouri River. Motorboat operators in marked areas at the mouth of the Heart River, Marina Bay, and the mouth of Square Butte Creek, all along the Missouri River, must operate their boats at idle speed only. "Idle speed" is defined as operating the motorboat at the slowest possible speed necessary to maintain steerage. Idle speed areas are designated with signs along the shore or with buoys in the water. History: Effective January 1, 1992. General Authority: NDCC 20.1-13-12, 20.1-13-14 Law Implemented: NDCC 20.1-13-12 4