Big Branch (Haw River tributary)Big Branch is a long 2nd order tributary to the Haw River, in Alamance County, North Carolina.CourseBig Branch rises west-northwest of Mandale in Alamance County, North Carolina and then flows east to the Haw River about 1.5 miles northeast of Mandale.WatershedBig Branch drains of area, receives about 47.1 in/year of precipitation, and has a wetness index of 426.73 and is about 47% forested.