National Dam Inspection Program. Big Bass Lake Dam (NDI ID Number PA-00368 DER ID Number 35-126), Delaware River Basin, Tamarack Creek, Lackawanna County, Pennsylvania. Phase I Inspection Report,
Abstract
The essential features of Big Bass Lake Dam are a masonry gravity main spillway across the natural stream, an auxiliary spillway in an earthen cut, an embankment in a natural saddle, and an outlet works. The masonry gravity spillway extends across the stream and into the stream banks on each side. Based on visual inspection, available records, calculations, past operational performance, and according to criteria established for these studies, Big Bass Lake Dam is judged to be unsafe, nonemergency, because the spillway capacity is rated as seriously inadequate. The spillway can only pass 10 percent of the Probable Maximum Flood (PMF) without overtopping of the low area by the main spillway walls. It is estimated that the main spillway weir will fail at about the 20 percent PMF flood. The stability of the main spillway is considered marginal for the normal operating conditon. The stability is significantly worse for higher pool levels. There is no evidence of significant problems threatening the embankment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1979
- Accession Number
- ADA078873
Entities
People
- Frederick Futchko