I have a 'General Highway Map' of Sussex County put out by the Delaware Dept. of Highways and it has a remarkable number of creeks on it... many of the names are the same today as in colonial days due to their official use as boundary markers. It is available at the Dept. of Highways in Georgetown in that cluster of state buildings that contains the State Service Center, Division of Motor Vehicles and the Dept of Highways right by the traffic light on route 113.