Cross Brook (New Jersey)Cross Brook is a tributary of Six [Mile Run (New Jersey)|Six Mile Run] in Somerset and Middlesex Counties, New Jersey in the United States.CourseThe source of Cross Brook is near Suydam Road in eastern Franklin Park, at. It flows through the Six Mile [Run Reservoir Site] and crosses Jacques Lane. After Jacques Lane it drains into the Six Mile Run at.Animal lifeCross Brook is a slow-moving stream, although it is not marshy. Some species of fish may be expected to be found in it.TerrainThe Cross Brook starts as a lake which drains into grasslands, forming a marshy area around its source. It is still muddy farther downstream. It tends to be a wide, slow, deep stream.AccessibilityCross Brook is a short stream, only crossing one road. There are a few trails in the woods that lead to it.Sister tributariesNine Mile RunSteep Hill BrookMiddlebush Brook