That body of backwater lying above the India Hook Dam on the Catawba River in York County, and extending to the North Carolina state line, together with the waters of the streams tributary thereto from the points at which such tributaries empty into the lake to the points where the flow of such streams is normal and the water level not raised by the impounding of the backwaters of the lake, are hereby set apart as the Catawba Lake Fishing Area, such tributary limits to be clearly marked with signs by the department.