Beaverdam Brook is a small stream in central East Brunswick, New Jersey, and a tributary of Lawrence Brook. Rising near Ryders Lane and Dunhams Corner Road, it flows west across the township into Farrington Lake, the impounded section of Lawrence Brook. Along the way it passes under several local roads and beneath the New Jersey Turnpike, and it runs through Tamarack County Golf Course, making it comparatively accessible. As part of the Lawrence Brook system, it is one of several smaller streams that contribute water to the larger waterway.