National Program for Inspection of Non-Federal Dams. Fernwood Lake East Dam (MA 01336), Fernwood Lake West Dam (MA 01337), Massachusetts Coastal Basin, Glouchester, Massachusetts. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
Pagination or Media Count:
Fernwood Lake is impounded by three separate earth embankment dams believed to have been built in 1877. There is also a 325 ft. long South Dike separating a portion of the south end of the lake however, it has a low hazard potential and thus was excluded from inspection. East Dam is approximately 100 ft. long and has a maximum height of 5 ft. Its 8-in diameter outlet pipe has been blocked. West Dam is approximately 400 ft. in length and a maximum of 11 ft. in height. It has a 14-in. diameter low-level outlet. The main dam at the north end of the lake is 450 ft. in length, 19 ft. in height and has a 19 ft. long spillway crest. The main Fernwood Lake North Dam - MA 00184 was the subject of a previous Phase I Inspection Report dated April 1979. The East and West dams are both in poor condition, based on visual examination of the structures. Hydraulic analyses indicate that the test flood outflow of 370 cfs inflow 475 cfs or 913 csm would overtop East Dam by 0.5 ft. and that a freeboard of 1.5 ft. would remain at West Dam. A freeboard of 1.6 ft. would remain at North Dam and South Dike would be overtopped by 0.3 ft. With the water level at the top of East Dam, the spillway capacity at North Dam with flashboards in place is about 80 cfs or 22 percent of the peak test flood outflow.
- Hydrology, Limnology and Potamology
- Civil Engineering