Mannitto is a private dam located in Loyalhanna Township, Westmoreland County, Pennsylvania. Managed by the Pennsylvania Department of Environmental Protection, this earth dam stands at a height of 18 feet and spans a length of 550 feet along the TR Loyalhanna Creek. Originally constructed for recreational purposes, Mannitto has a storage capacity of 95 acre-feet and a surface area of 11 acres.

Despite its low hazard potential, Mannitto has not been rated for its condition assessment. The last inspection took place in June 2017, with a scheduled inspection frequency of every five years. The dam is not associated with any federal agencies and has not undergone any significant modifications since its completion. With its surrounding area covering 0.25 square miles of drainage, Mannitto serves as a vital water resource for the local community.

Enthusiasts of water resources and climate will find Mannitto an intriguing structure due to its unique design and purpose. With its location in a picturesque setting along the Loyalhanna Creek, this dam provides both recreational opportunities and essential water storage for the region. While it has not been rated for condition assessment, Mannitto remains a significant feature in the landscape of Westmoreland County, Pennsylvania, showcasing the intersection of human infrastructure and natural resources in the context of water management and conservation.