National Dam Inspection Program. Clover Dam (NDI ID Number PA-420, DER ID Number 33-4) Ohio River Basin, Clover Run, Jefferson County, Pennsylvania. Phase I Inspection Report

摘要

Clover Dam consists of an earth embankment constructed around timber cribbing filled with stone and earthen materials. The dam has a crest length of approximately 550 feet with a maximum height of approximately 31 feet from the downstream toe. The crest width of the dam is about 25 feet with a downstream slope of 2.5H to 1V. A portion of the downstream slope near the left abutment is steeper (approximately 1H:1V). A steel sheet-pile wall exists along the upstream edge of the crest for the total length of the embankment. The sheet piling appears to be battered (approximately 1H:3V). The flood discharge facilities for the dam consist of an overflow spillway located at the center of the embankment. The steel sheet piling on the upstream face of the dam continues across the crest of the spillway. The spillway is approximately 60 feet long and is about 3-1/2 feet deep at the right abutment wall. The spillway discharge channel is a rectangular reinforced concrete channel. The channel is 61 feet wide at the overflow section and then converges uniformly to a width of about 40 feet at midheight of the embankment. The discharge channel terminates at a plunge pool at the toe level of the dam. Commonwealth inspection reports indicate that the spillway discharge channel was directly founded on timber cribbing.