Drum Creek (Roy Creek tributary)  Drum Creek is a long 1st order tributary to Roy Creek, in Sussex County, Delaware. Drum Creek rises on the Bearhole Ditch divide at Williamsville in Sussex County, Delaware. Drum Creek then flows east to meet Roy Creek at Keen-Wik, Delaware. Drum Creek drains of area, receives about 44.5 in/year of precipitation, has a topographic wetness index of 779.20 and is about 1.25% forested.