Lake Chillisquaque in Montour County, Pennsylvania, is a privately owned reservoir situated along Chillisquaque Creek, with a dam structure completed in 1971. The dam, primarily used for recreational purposes, is an earth-type construction with a height of 54 feet and a length of 2000 feet. The reservoir has a storage capacity of 4400 acre-feet, with a normal storage level of 2200 acre-feet, covering a surface area of 113 acres within a drainage area of 5.6 square miles.

Despite being regulated by the Pennsylvania Department of Environmental Protection, Lake Chillisquaque has a high hazard potential due to its condition being assessed as fair. The dam underwent mechanical modifications in 2011, and regular inspections are conducted to ensure its integrity. The reservoir's location in Anthony Township, along with its proximity to major water bodies, underscores the importance of its management and maintenance to safeguard against potential risks and ensure the sustainable utilization of its water resources for the community and the environment. Enthusiasts of water resources and climate will find Lake Chillisquaque to be a valuable case study in dam infrastructure and reservoir management.