Furnace Run is a vital water supply structure located in Ligonier Township, Westmoreland County, Pennsylvania. Constructed in 1915, this Earth-type dam stands at a height of 19 feet and stretches 700 feet in length, providing a storage capacity of 36 acre-feet. Managed by the Pennsylvania Department of Environmental Protection, Furnace Run serves as a crucial resource for the surrounding community, with a normal storage capacity of 27.9 acre-feet and a drainage area of 4 square miles.

Despite its age, Furnace Run's condition is assessed as fair, with a high hazard potential, prompting regular inspections by state regulatory agencies to ensure its structural integrity and operational safety. With a primary purpose of water supply, this dam plays a crucial role in meeting the water needs of the region, highlighting the importance of sustainable management and maintenance practices. As a key component of the local water infrastructure, Furnace Run serves as a testament to the resilience and longevity of water resource systems in the face of evolving climate challenges.