Mountain Shadow Lake, located in Beaver Township, Pennsylvania, is a private recreational lake regulated by the Pennsylvania Department of Environmental Protection. Built in 1954, this earth dam is primarily used for recreation and spans 550 feet in length with a height of 20 feet, offering a surface area of 35 acres and a storage capacity of 417 acre-feet. The dam holds an important role in managing the Beaver Run river system and has a drainage area of 3.37 square miles.

Despite its fair condition assessment, Mountain Shadow Lake poses a high hazard potential, highlighting the need for regular inspections and maintenance to ensure the safety of the surrounding community. The last inspection in June 2018 revealed the dam's structural integrity, while the emergency action plan status remains unclear. The presence of a high-risk classification underscores the importance of implementing risk management measures and staying prepared for any potential emergencies. Water resource and climate enthusiasts can appreciate the delicate balance between recreational enjoyment and environmental safety that Mountain Shadow Lake represents.