The earthen Diamond Hill Reservoir Dam was constructed in 1971 with a height of 80 feet (24 m), and a length of 2,000 feet (610 m) at its crest.

[2] It impounds the Abbott Run waterway for municipal drinking water.

Both dam and reservoir are owned and operated by the city of Pawtucket's Water Supply Board.

The reservoir it creates has a normal surface area of 390 acres (160 ha), a maximum capacity of 15,680 acre-feet (19.34 million cubic metres), and a normal storage of 11,000 acre⋅ft (14 million m3).

Immediately adjacent to the south is the Arnold Mills Reservoir.