National Dam Inspection Program. Bradford City Number 3 Dam (NDI-PA-00025, PennDER Number 42-10), Ohio River Basin, Marilla Brook, McKean County, Pennsylvania. Phase I Inspection Report,
BAKER (MICHAEL) JR INC BEAVER PA
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Bradford City No. 3 Dam consists of a diaphragm earthfill embankment approximately 47 feet high and 770 feet long. A core wall consisting of mortar and sandstone blocks was constructed in the center of the embankment. The core wall extends 25 feet into each hillside and approximately 9 feet below the original ground surface at the deepest point in the center of the valley. The visual inspections and review of engineering data, performed in November 1978 through February 1979, indicate no serious deficiencies in the embankment requiring emergency attention. The dam was found to be in good overall condition at the time of inspection. However, the inspection revealed certain items of maintenance and rehabilitation necessary for the dam. Hydraulichydrologic evaluations revealed that the spillway will not pass the Probable Maximum Flood PMF without overtopping the dam. The spillway is considered inadequate because the analysis indicated the spillway will pass a maximum of 45 percent of the PMF before overtopping the dam, and failure of the dam is not likely to occur under 50 percent PMF conditions.
- Civil Engineering