The earthen Diamond Hill Reservoir Dam was constructed in 1971 with a height of 80 feet, and a length of 2000 feet at its crest. It impounds the Abbott Run waterway for municipal drinking water. Both the 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, a maximum capacity of 15,680 acre-feet, and a normal storage of 11,000 acre-feet. Immediately adjacent to the south is the Arnold Mills Reservoir.

The AllTrails.com website has a description and map of a loop trail near the shore of Diamond Hill Reservoir.