National Dam Inspection Program. Lakemont Dam (NDI ID Number PA-528, DER ID Number 7-50), Susquehanna River Basin, Brush Run, Blair County, Pennsylvania. Phase I Inspection Report

摘要

Based on the evaluation of the existing conditions, the condition of Lakemont Dam is considered to be unsafe/nonemergency due to severe structural deterioration on the concrete overflow ogee section of the spillway. The second spillway section consists of a beam and stop log arrangement. This bay also incorporates two discharge gates which are manually operated by a chain pulley mechanism. Although no serious structural distress was observed in this stop log arrangement, the configuration of the structure is not considered to be acceptable as an impounding structure. The main load-carrying beams of the structure are supported by concrete which appears to have questionable strength and both the concrete and the steel beams are subject to deterioration. The flood discharge capacity of Lakemont Dam was evaluated according to the recommended procedure and was found to pass less than 5 percent of the probable maximum flood (PMF) without overtopping the dam. Therefore, according to the recommended criteria, the flood discharge capacity of Lakemont Dam is classified to be inadequate. However, the spillway is not considered to be seriously inadequate because overtopping of the dam, in view of its wide crest width, is not likely to pose a serious breach potential that would significantly increase downstream damage.