Lake Sinca, located in Tobyhanna Township, Pennsylvania, is a privately owned reservoir primarily used for recreation. Built in 1969, this earth dam stands at a height of 24 feet and spans a length of 1100 feet, with a storage capacity of 221 acre-feet. The reservoir covers a surface area of 22 acres and is situated along the TR Twomile Run river or stream.

Managed by the Pennsylvania Department of Environmental Protection, Lake Sinca is subject to state regulations, inspections, and enforcement to ensure its safety and integrity. Despite being classified as having a high hazard potential, the dam is currently assessed to be in fair condition. With a normal storage capacity of 132 acre-feet, the reservoir serves as a vital recreational resource for the surrounding community and offers opportunities for boating, fishing, and other water-based activities.

As a key feature in the region's water resource system, Lake Sinca plays a crucial role in providing both recreational enjoyment and flood control measures. Climate and water resource enthusiasts will find this reservoir to be a fascinating example of human-engineered infrastructure interacting with natural water systems in the context of climate change and environmental stewardship.