National Dam Inspection Program. Mountain Lake Dam (NDI ID Number PA-00546, DER ID Number 40-50). Delaware River Basin, Meadow Run, Luzerne County, Pennsylvania. Phase I Inspection Report,

Based on criteria established for these studies, Mountain Lake Dam is judged to be unsafe, nonemergency, because the spillway capacity is seriously inadequate. The recommended Spillway Design Flood (SDF) for the size and hazard category of the dam varies between 1/2 of the Probable Maximum Flood (PMF) and the PMF. Based on the criteria and the downstream conditions, the selected SDF is the PMF. Based on existing conditions, the spillway will pass about 20 percent of the PMF before overtopping of the dam occurs. Failure of the dam would increase the hazard to loss of life downstream. If the dam were raised to its design elevation, the spillway would pass about 28 percent of the PMF. The spillway capacity would still be rated as seriously inadequate. As a whole, the dam is judged to be in poor condition. Lack of maintenance has caused the spillway to deteriorate to such an extent that it is on the verge of collapse. It is unlikely that the spillway could withstand any flood of significant duration. (Author)