The White Reservoir is mostly in Westhampton but the dam is in Southampton. It was built in 1913 but as of 1982 it is only a retainer dam and reservoir.
In the years before it was built, Holyoke Water Works had been buying lands in those two communities. Farms were being abandoned anyway and so people were not being kicked off the land.
A gate once blocked the entrance but at this point it is just an ornament.
The dam has a gatehouse and a spillway.