National Dam Inspection Program. Twin Lakes Number 1 Dam (NDS1.D. PA-00487, PennderI.D. 65-42), Ohio River Basin, Little Crabtree Creek, Westmoreland County, Pennsylvania. Phase I Inspection Report.
GAI CONSULTANTS INC MONROEVILLE PA
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Twin Lakes No. 1 Dam, previously known as the Lower Donohoe Dam, is a recently renovated 1975 earth embankment approximately 950 feet long with a curved crest and a maximum height of about 31 feet. The facility is serviced by an uncontrolled, concrete chute spillways, 80 feet wide at the crest and 25 feet wide at the toe, located at the center of the embankment. The facility is equipped with newly constructed outlet works consisting of a 16-inch diameter ductile valve, and outlet discharge pipe. The control valve is operated from a manhole accessible from the embankment crest just left of the spillway. An extension on the control valve permits operation without actually descending the manhole. The dam is located in Hempfield and Unity Townships, Westmoreland County, on Little Crabtree Creek, approximately three miles northwest of the city of Greensburg, Pennsylvania.
- Civil Engineering