Pottersville Reservoir Dam is a rubble masonry gravity dam with a concrete core. It has a height of 20.8 feet and an overall length of approcimately 180 feet. The dam is comparised of three sections: a wingwall on the left and on the right; and a 50 foot spillway in the center. The spillway is a broad crested weir with a 20 foot wide notch, three inches deep, in the center. The crest of the natch is 3.0 feet below the top of the wingwalls. The low-level outlet consists of two 16-inch cast iron pipes through the spillway. The overall condition of the dam is fair. There are no major signs of distress or instability in the dam. Minor seepage was observed in downstream face of the right wingwall just right of the spillway. A section of the masonry facing on the downstream slope of the left wingwall has sloughed off. Pottersville Reservoir Dam is considered inadequate in view of its lack of spillway capacity to pass the SDF (1/2 PMF) without overtopping the dam. The spillway is capable of passing a flood equal to 8 percent of the PMF (16 percent of the 1/2 PMF), and is assessed as 'inadequate'.