The visual inspection, operational history, and hydrologic/hydraulic analysis indicate that the facility is in excellent condition. The size classification of the facility is intermediate and its hazard classification is considered to be high. In accordance with the recommended guidelines, the Spillway Design Flood (SDF) for the facility is the PMF (Probable Maximum Flood). Results of the hydrologic and hydraulic analysis indicate the facility is capable of passing and/or storing the PMF. Consequently, its spillway is considered adequate. It is recommended that the owner immediately (a) provide positive drainage for the area between the left spillway wingwall and left abutment hillside and (b) repair and seal all concrete cracks observed along the left spillway wingwall. (Author).

Based on a visual inspection, operational history, and available engineering data, the facility is considered to be in good condition. The size classification of the facility is intermediate and its hazard classification is considered to be high. In accordance with the recommended guidelines, the Spillway Design Flood (SDF) for the facility is the PMF (Probable Maximum Flood). Results of the hydrologic and hydraulic analysis indicate the facility will pass and/or store only about 45 percent of the PMF prior to embankment overtopping. A breach analysis indicates that failure under less than 1/2 PMF conditions could lead to increased downstream damage and potential for loss of life. Thus, based on screening criteria provided in the recommended guidelines, the spillway is considered to be seriously inadequate and the facility unsafe, non-emergency. Calculations also indicate that if the spillway were constructed in accordance with available desing drawings, the facility could pass and/or store approximately 63 percent of the PMF.

The dam is located across Mill Creek, approximately three miles upstream from its confluence with the Tuscarora Creek in Tuscarora Township, Bradford County, Pennsylvania. The dam is classified to be in the significant hazard category. It is estimated that failure of the dam may cause loss of a few lives and some property damage in these areas. The onsite inspection of Mill Creek Dam consisted of: Visual inspection of the embankment, abutments, and embankment toe, Visual examination of the spillway and the visible portions of the outlet works, and Evaluation of downstream area hazard potential.