National Program for Inspection of Non-Federal Dams. Granite Reservoir Dam (MA 00105), French River Basin, Oxford, Massachusetts. Phase I Inspection Report.
Abstract
Granite Reservoir Dam is a 615-foot long, 18-foot high earthfill dam. The downstream face of the dam is a vertical dry stone masonry wall. The upstream face is an earthen slope, except in the vicinity of the outlet works, where there is a concrete headwall. The spillway, which is located about 250 feet from the right abutment of the dam, consists of a concrete weir with a slightly rounded crest and a broad concrete apron. The length of the weir is 66 feet and is at elevation (El) 631.0. The downstream face of the weir is a concrete and stone cascade which leads to a rectangular stilling basin. The outlet for the dam is a 2-foot square box conduit through the embankment and is located about 125 feet northeast of the spillway. Flow through the conduit is controlled b a 3-foot-square wooden sluice gate. The following are visible signs of distress which indicate a potential hazard at the site: a severe bulge in the downstream stone masonry wall of the dam; leakage through the outlet conduit and through the masonry wall in the vicinity of the bulge; possible damage to the outlet gate; seepage below the toe of the embankment; erosion at several locations on the dam embankment and along the outlet channel; dense growth of trees and brush at the dam and along the discharge channels; and minor deterioration of the concrete on the spillway. An outflow test flood (one-half the probable maximum flood) of 2,800 cfs at El 635.7 will overtop the dam by 1.3 feet. The spillway can discharge 38 percent of the test flood.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1979
- Accession Number
- ADA145299
Entities
Organizations
- New England District, U.S. Army Corps of Engineers