Monroe Lake in Monroe, Pennsylvania, is a privately owned reservoir regulated by the Pennsylvania Department of Environmental Protection. This Earth dam, completed in 1926, serves primarily for recreation purposes, with a storage capacity of 403 acre-feet and a surface area of 85 acres. The dam stands at 12 feet in height and spans 390 feet in length, holding back the waters of Bear Swamp Run.

Despite its fair condition assessment, Monroe Lake has a high hazard potential, prompting regular inspections and modifications for structural and hydraulic improvements in 2003 and 2012. The reservoir's emergency action plan status and risk management measures are unspecified, indicating room for improvement in ensuring the safety of downstream communities. With its picturesque location in Middle Smithfield Township and Matt Cartwright (D) as the representative, Monroe Lake presents both a recreational gem and a management challenge in balancing water resource utilization and climate resilience.