National Dam Inspection Program. Olyphant Number 3 Dam (NDII.D.-PA-00381) (DER-I.D.-35-03), Susquehanna River Basin, Grassy Island Creek, Lackawanna County, Pennsylvania. Pennsylvania Gas and Water Company. Phase I Inspection Report.
GANNETT FLEMING CORDDRY AND CARPENTER INC HARRISBURG PA
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Olyphant No. 3 Dam is an earthfill embankment 760 feet long and 37 feet high at its maximum section. The embankment has a puddled impervious core and riprap on both the upstream and downstream slopes. The spillway is located at the right abutment of the dam. It is an excavated, riprapped channel with irregular geometry. The invert of the channel is 2.6 feet below the design level of the top of the dam. A 12-inch diameter cast-iron pipe with a valve at the downstream end extends through the center of the embankment and regulates flows. Olyphant No. 2 Dam is 0.5 mile downstream. The dam is located on Grassy Island Creek approximately 1.7 miles east of the Village of Winton, Pennsylvania.
- Civil Engineering