 The water surface at the Quabbin Reservoir is about 524 feet (159.7 m) above Mean Sea Level (MSL).The water surface at the Wachusett Reservoir is about 384 feet (117.1 m) above MSL, and the water surface at the Ware River Diversion is about 660 feet (201 m) higher than MSL.A natural siphon can only lift water about , with the aqueduct located several hundred feet underground in places – however the water head is only about 25 feet (8 m) on the suction side of the aqueduct.