Our final destination was the Quabbin Reservoir where we hiked along the Winsor Dam, climbed to the top of the Quabbin Hill tower and walked out along the Goodnough Dike. The dam is one of the largest in the east at 2640 feet in length. The reservoir provides the drinking water for Boston and is carried there by a series of underground tunnels the longest of which is 25 miles and terminates at the Wachusett Reservoir. When the Quabbin was created, the towns of Dana, Enfield, Greenwich and Prescott had to be abandoned and now lie at the bottom of the 150-foot deep reservoir.