The tailrace carried water exhausted from the turbine down to the bottom of the inclined plane.

The tailrace carried water quickly away from the turbine chamber and down to Lopatcong Creek, where it eventually emptied back into the canal. Underground, the tailrace is a mortared stone-arched tunnel that originally had a timber floor and short side walls to prevent the water from causing erosion and undermining the masonry. There’s an iron collar on the head wall of the tailrace tunnel to hold the wall together. A timber bypass channel, which carried water from the top of the penstock when the turbine was not in operation, emptied into the tailrace just below this head wall. The above-ground portions of the tailrace had short dry-laid stone walls against its sides and a timber sluice to carry the water. Stones are still visible in the creek at the tailrace outlet. A small timber bridge carried farm traffic across the tailrace just down from where it emerges from underground.