Lake Sakakawea, ND Attractions Riverdale Garrison Dam National Fish Hatchery and Aquarium Garrison Dam and Power Plant Misty the Mermaid Lake Sakakawea State Park Douglas Douglas Centennial Museum New Town Four Bears Bridge 4 Bears Casino and Lodge Old 451 Three Tribes Museum Crow Flies High Butte Edgewater Country Club Garrison Fishing Hall of Fame Wally the Walleye Heritage Park Museum Fort Stevenson Guardhouse Fort Stevenson State Park Garrison Golf Club