Robinsons Branch is a tributary of the Rahway River in Union and Middlesex Counties, New Jersey, United States.
The headwaters of Robinsons Branch are in Fanwood, Plainfield[1] and Edison, New Jersey.[2] It flows through Scotch Plains, Westfield, Clark, and Rahway, emptying into the Rahway River approximately five miles above the Arthur Kill.[3] The drainage area is 21.6 square miles,[4] mainly in Union County.[1] The river is impounded at Robinson's Branch Reservoir and Milton Lake, and tidal to Milton Lake Dam. At the confluence of Pumpkin Patch Brook with Robinsons Branch flooding is a frequent problem, exacerbated by densely developed land.[2] Flooding is both fluvial and tidal.[5]