No 1 is a privately owned dam located in Coolbaugh Township, Monroe County, Pennsylvania, along the Tobyhanna Creek. Built for purposes other than flood control or water supply, this Earth-type dam stands at a height of 8 feet and has a storage capacity of 334 acre-feet. Despite being regulated by the Pennsylvania Department of Environmental Protection and meeting state permitting, inspection, and enforcement requirements, No 1 is classified as having a low hazard potential and a poor condition assessment.

The dam, managed by a private owner, has not undergone any significant modifications since its construction, with the last inspection taking place in July 2017. Although it does not pose a high risk, its poor condition raises concerns about its long-term safety and functionality. Given its location in a populated area and potential impact on the surrounding environment, continued monitoring and potential rehabilitation efforts may be necessary to ensure the reliability of No 1 as a water resource infrastructure in the face of changing climate conditions.