The Six Mile Run is a tributary of the Millstone River that, with its tributaries (Cross Brook, Middlebush Brook, Nine Mile Run and Steep Hill Brook and several other unnamed ones), drains a large area in central Franklin Township, Somerset County, New Jersey and western portions of North Brunswick and South Brunswick Townships in Middlesex County, New Jersey.
The Six Mile Run, a tributary of the Millstone River, flows through parts of Franklin Township, Somerset County, New Jersey, as well as North Brunswick and South Brunswick Townships in Middlesex County, New Jersey. It is fed by several smaller streams including Cross Brook, Middlebush Brook, Nine Mile Run, and Steep Hill Brook.