Belltown Run (Muddy Run tributary)Belltown Run is a tributary to Muddy Run in northern New Castle County, Delaware in the United States.CourseBelltown Run rises on the Long Creek divide New Castle County, Delaware and flows northeast to meet Muddy Run at Heather Woods.WatershedBelltown Run drains of area, receives about 45.2 in/year of precipitation, has a topographic wetness index of 622.53 and is about 18.0% forested.