This limestone chimney base is all that remains of the boiler house, where steam was produced to operate equipment throughout the site. Workers used steam to power pumps that kept the quarry dry, jack hammers that cut rock from the quarry, and a winch that pulled rock-filled carts to the kilns. It also powered the crushing and grinding machinery that produced the site's major products. The boiler house building also housed a small blacksmith shed for repairing equipment and making horseshoes for the work horse. When the chimney was torn down, the red bricks were salvaged and used to construct the fireplace in the building which is now the park's Nature Center.