National Program for Inspection of Non-Federal Dams. Manchester Pond Reservoir Dam (MA 00860), South Dike and East Dike (MA 01288, MA 01289), Providence River Basin, Attleboro, Massachusetts. Phase I Inspection Report.

Manchester Pond Dam, constructed in 1963, is a compacted zoned earthfill embankment about 1,510 ft. long with and impervious core. There are also four dikes or embankments on the reservoir rim. These dikes vary in length from 140 ft. to 915 ft., in height from 7 ft. to 16 ft., and all have a 15 ft. wide crest. A 15 ft. long ogee spillway crest is located on the right abutment of the dam. An outlet control structure is located about 200 ft. left of the right abutment. The reservoir can be drawn down by means of an 18 in. dia. pipe or a 48 in. dia. pipe. The routed test flood outflow 95 cfs would not overtop the dam. The spillway can pass the routed test flood outflow with about 2.2 ft. of surcharge to top of dam. The dam is judged to be in generally fair condition. There is minor seepage at the downstream toe. Brush and tree growth have taken a firm stand on the downstream slope, where several animal burrows were noted, and minor erosion along one area of the downstream slope was also evident. All four dikes or embankments are judged to be in good condition. There was no evidence of seepage along the dikes. Brush and tree growth have taken a firm stand on the crest and downstream slope of the dikes. The outlet facilities are all in good working condition. There is no adequate means of low level withdrawal.