National Dam Inspection Program. Shirf's Run Dam. Ohio River Basin, Unnamed Tributary of North Branch Blacklick Creek, Cambria County, Pennsylvania (NDI I.D. Number PA-00438, DER I.D. Number 11-71). Phase I Inspection Report,
D'APPOLONIA CONSULTING ENGINEERS INC PITTSBURGH PA
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Shirfs Run Dam consists of an earth embankment approximately 320 feet long with a maximum height of 15 feet from the downstream toe and a crest width of 10 feet. The upstream side of the dam is protected by riprap and the downstream slope is covered with grass. The spillway discharge facilities for the dam consist of an earth channel located at the right abutment. The outlet facilities consist of a 12-inch cast-iron pipe encased in concrete through the embankment. Based on the evaluation of the existing conditions, the condition of Shirfs Run dam is considered to be good. The only condition noted which requires attention is the lack of adequate erosion protection on the left side of the emergency spillway channel against the embankment. This condition is considered to pose breach potential in the event of large flows through the spillway. The flood discharge capacity of the dam was evaluated according to the recommended procedure and was found to pass approximately 50 percent of the probable maximum flood PMF without overtopping the embankment.
- Civil Engineering