Here is a description by the Army Corps of Engineers:
Fulton Pond is on the Fulton Pond River in Bristol County, Massachusetts and is used for recreation purposes. Construction was completed in 1998. It is owned by Town Of Mansfield.
Fulton Pond Dam is of earthen construction, a gravity dam. Its length is 800 feet. Its capacity is 144 acre feet. Normal storage is 24 acre feet. It drains an area of 12.5 square miles.