The exterior walls are made of fieldstone which is plastered and whitewashed. The interior of the first floor of the springhouse contains a stone base with a concrete cap measuring eighteen by five feet. This cap is surrounded on all four sides by water flowing into the springhouse. A small island of stone connects this cap to the springhouse door. Shelves project twelve inches at three feet above the water on the east and west walls.
Water flows into the springhouse from the northwest corner.
In this corner, the water is eighteen inches deep. In the rest of the room, the water is twelve inches deep. The flow of water in the springhouse exits in the southeast corner through a pipe that leads to a stream that runs between the farmhouse and springhouse. The size of the Pratt springhouse is one thing that distinguishes it from the common colonial springhouse. Measuring sixteen by twenty-four feet, it is larger than most springhouses of the era.