For nature lovers, there is a variety of wildlife in the area. A pair of American Bald Eagles call the reservoir home, and if you're lucky enough, you can get a glimpse of them flying overhead. Other birds of prey, including hawks and falcons, have been sighted, along with plenty of other waterfowl and several different types of bird species.

The Arnold Mills Reservoir was built in 1927 to add more water as urban expansion increased. This reservoir along with the Diamond Hill Reservoir is for drinking water purposes only. There is no recreational use, fishing, swimming, or boating in the reservoir and it is protected, operated, and owned by Pawtucket Water Works, though it resides in the town of Cumberland.