The Tighe-Carmody Reservoir was built in Southampton directly over the Manhan Reservoir and enlarged it greatly. Its dam is 800 feet long and 120 feet high.
It is now the major reservoir on the Manhan River and is blocked by the large Manhan Dam which was completed in 1956. The system is named after Thomas Carmody who was a plumber in Holyoke that also served on the water board for decades. Thomas died the 8th of August 1937.
In 1988 the Carmody pipeline was built from the dam to the northern tip of McLean Reservoir. This requires the water to be pumped over East Mountain. To do this the Manhan River is used as the pumping force to push the reservoir water up.