The Round Valley Reservoir in Clinton Township in Hunterdon County, New Jersey, United States, was formed in 1960 when the New Jersey Water Authority constructed two large dams and flooded a large valley. The reservoir is named after the naturally formed circular valley surrounded by Cushetunk Mountain. The deep valley was caused by erosion of the soft sedimentary rock. The surrounding ridges of Cushetunk Mountain endure because they were underlaid with dense and durable volcanic rock diabase that cooled slowly under the surface of the Earth.
Reaching depths of 55 m, this 9.5 km2 reservoir is best known for its pristine clear blue waters. The reservoir contains 210,000,000 m3 of water for use in central New Jersey, making it the largest in the state. Its water is distributed during times of drought via the nearby south branch of the Raritan River.
