Ashley Reservoir, reservoir in Holyoke, Massachusetts, USA

Ashley Reservoir is a reservoir in Holyoke, Massachusetts, formed by Wright Pond and Ashley Pond. Its construction finished and it became fully operational in 1897, with an impound capacity of more than 795 million US gallons. It is the city's secondary drinking supply, and a pumping plant links it to the smaller McLean Reservoir.

Ashley Reservoir became fully operational in 1897, built by the Holyoke Water Works as the city's secondary drinking supply. It consists of Wright Pond and Ashley Pond, with an impound capacity of more than 795 million US gallons and a safe yield of 2.1 million gallons per day. It links to the smaller McLean Reservoir, named for Water Works Commissioner Hugh McLean, through a pumping plant.

The reservoir takes its name from its two ponds, Wright Pond and Ashley Pond. It is operated by the Holyoke Water Works, whose commissioner Hugh McLean is remembered in the neighbouring McLean Reservoir, linked to Ashley by a pumping plant. The surrounding gravel road is open to walkers, but rules bar dogs, horseback riding, camping, smoking, sledding and motorcycles.

The reservoir is partially open to the public with walking paths around the water. Fishing, dogs, camping, and motorcycle riding are not allowed to protect the water quality.

Ashley Reservoir is a Class II hazard reservoir and the secondary drinking supply for Holyoke, with an impound capacity of more than 795 million US gallons and a safe yield of 2.1 million US gallons per day. It connects to the smaller McLean Reservoir, named after Holyoke Water Works Commissioner Hugh McLean, through a water-pumping plant run by the Holyoke Water Works.