National Dam Inspection Program. Hinckston Run Dam (NDS I.D. Number PA-00430, PennDer I.D. Number 11-9), Ohio River Basin, Hinckston Run, Cambria County, Pennsylvania. Phase I Inspection Report,

Based on a visual inspection, review of post-construction engineering studies, and available engineering data, the Hinckston Run Dam is considered to be in good condition. Deficiencies were limited to general deterioration of the concrete spillway section, and apparent inoperability of the valves within the intake tower. The size classification of the facility is intermediate, and the hazard classification is considered to be high. In accordance with the recommended guidelines, the Spillway Design Flood (SDF) for the facility is the Probable Maximum Flood (PMF). Results of the hydrologic and hydraulic analysis indicate the facility can pass and/or store about 38 percent of the PMF prior to overtopping of the embankment. Overtopping, even under floods of PMF magnitude, is not expected to cause failure of the unusually massive embankment configuration which is composed of erosion-resistant, hot-poured slag. Thus, the spillway system is considered to be inadequate, but not seriously inadequate.