Dickinson Dam and Reservoir (Edward Arthur Patterson Lake), on the Heart River, store water for irrigating valley lands downstream from the dam, and for a municipal water supply for the city of Dickinson, North Dakota. The reservoir has approximately 1,191 water surface acres, 1,276 land acres and 22 miles of shoreline. Public use area open 7 days a week. Overnight camping, water and electric hookups. Available species include walleye, largemouth bass, perch, pike, crappie, and bluegill.Dickinson Dam and Reservoir are features of the Dickinson Unit, Pick-Sloan Missouri Basin Program. Current Reservoir Levels