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National Dam Inspection Program. Lake Strause Dam (NDI Number PA-01010, DER Number 38-068), Susquehanna River Basin, Lebanon County, Pennsylvania. Phase I Inspection Report

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Based on the visual inspection, past performance and the available engineering data, the dam and its appurtenant structures appear to be in good condition. In accordance with the Corps of Engineers evaluation guidelines, the size classification of this dam is small and the hazard classification is significant. These classifications indicate that the Spillway Design Flood SDF should be in the range of the 100 year flood to one-half the Probable Maximum Flood PMF. The recommended SDF for this structure is the 100 year flood. The spillway capacity is insufficent for passing the SDF peak inflow without overtopping the dam. The spillway, therefore, is considered to be inadequate. The following recommendations are presented for immediate action by the owner 1 That provisions be made to increase the spillway capacity. 2 That the bare areas on the downstream slope be reseeded. 3 That the drop inlet structure be inspected for structural adequacy after the reservoir has been lowered. 4 That the struts in the spillway be removed and that the wooden waterway diversion poles be secured by other means. 5 That a formal surveillance and downstream warning system be developed for use during periods of high or prolonged rainfall. 6 That an operation and maintenance manual be prepared for guidance in the operation of the dam during normal and emergency conditions, and that a schedule be developed for the annual inspection of the dam and its appurtenant structures. Author

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

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