Pumpkin Patch Brook is a stream in Union and Middlesex counties in the U.S. state of New Jersey.
[1] It is a tributary of Robinson's Branch of the Rahway River.
It is frequently inundated by backflow from Robinson's Branch; generally only "relatively moderate" flooding is seen along this brook.
Most of the flooding in Clark originates from Pumpkin Patch Brook.
[2] Suburban development in both townships has increased surface water run-off over impervious land with "over the bank" flooding along the brook.