National Program for Inspection of Non-Federal Dams. Lake Mirimichi Dam (MA 00168), Taunton River Basin, Foxborough, Massachusetts. Phase I Inspection Report.

摘要

Lake Mirimichi Dam is a 620-foot long, 14-foot high earthfill dam including a ogee spillway. The 36.5-foot long, concrete spillway essentially bisects the dam. The outlet conduit is a 24-inch pipe located between the spillway and the right abutment of the dam. Flow through the conduit is controlled by two slide gates housed in a concrete chamber located in the embankment. The dam is in fair condition. The following are visible signs of distress: seepage just beyond the downstream toe of the dam and dike, growth of brush and trees on the dam and dike, erosion at several locations on the embankment, lack of adequate riprap protection on the upstream face of the dam and dike, corrosion of stems on the slide gates and spalled and cracked concrete on the weir and training walls of the spillway. The test flood would overtop the dike by about 2.2 feet, the dam by 0.8 foot, and a swale at the south end of the lake by 1.3 feet. The spillway can discharge only 17.5 percent of the test flood before the dike is overtopped.