National Dam Inspection Program. Williamsburg Station Dam (NDI ID Number PA-540, DER ID Number 7-48), Susquehanna River Basin, Frankstown Branch, Juniata River, Blair County, Pennsylvania. Phase I Inspection Report
KIMBALL (L ROBERT) AND ASSOCIATES EBENSBURG PA
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The assessment of Williamsburg Station Dam is based upon visual observations made at the time of inspection, review of available records and data, hydraulic and hydrologic computations and past operational performance. The inspection and review of data at the Williamsburg Station Dam did not reveal any problems which require emergency action. The dam appears to be in fair condition. The Williamsburg Station Dam is a high hazard-intermediate size dam. The Spillway Design Flood for a dam of this size and classification is the PMF. The spillway and reservoir are capable of controlling approximately 18 of the PMF. Based on criteria established by the Corps of Engineers, the spillway is termed inadequate. This dam is a run-of-river type dam with inflow discharging over the spillway. With high discharges the tailwater builds up rapidly causing the weir to become submerged. Downstream flooding normally will result because of runoff in excess of river capacity rather than a result of dam failure. Dam failure at low river flows could result in the loss of more than a few lives in the town of Williamsburg and downstream flooding due primarily to the failure.
- Hydrology, Limnology and Potamology
- Civil Engineering