Monponsett Pond, also called Monponsett Lake and the Twin Lakes, originally one lake is dissected by route 58 into a system of two ponds, West and East, mostly in Halifax, Massachusetts, with a small portion of West Monponsett Pond extending into Hanson. The western basin is 308 acres, and the eastern basin is 272 acres. The average depth of bot…Monponsett Pond, also called Monponsett Lake and the Twin Lakes, originally one lake is dissected by route 58 into a system of two ponds, West and East, mostly in Halifax, Massachusetts, with a small portion of West Monponsett Pond extending into Hanson. The western basin is 308 acres, and the eastern basin is 272 acres. The average depth of both ponds is seven feet and the maximum depth is 13 feet. The outflow is Stump Brook, located in the northwestern part of West Monponsett Pond, which flows in a southwest direction into Robbins Pond, which forms the headwaters of the Sautucket River, a tributary of The Taunton River. The pond is part of the Taunton River Watershed. Water from Monponsett is diverted into Silver Lake, the principal water supply for the City of Brockton. Water diversions from Monponsett into Silver lake are not permitted during the summer months from June 1 - September 30. Diversions are only allowed during the months of October through May.