Smithville DitchSmithville Ditch is a long second-order tributary to Tommy Wright Branch in Caroline [County, Maryland]. This is the only stream of this name in the United States.CourseSmithville Ditch rises about southeast of Denton, Maryland, and then flows generally south to join Tommy Wright Branch about west-southwest of Smithville, Maryland.WatershedSmithville Ditch drains of area, receives about 44.6 in/year of precipitation, and is about 12.11% forested.