Core Creek (Pa-620), also known as Lake Luxembourg, is a local government-owned reservoir in Bucks County, Pennsylvania. Managed by the USDA NRCS, this earth dam was completed in 1976 for flood risk reduction purposes. With a height of 47 feet and a length of 860 feet, the dam has a storage capacity of 5,599 acre-feet and serves a drainage area of 9.6 square miles.

Despite a fair condition assessment and a high hazard potential, Core Creek remains regulated by the Pennsylvania Department of Environmental Protection. The dam is also used for recreation and water supply purposes, with a surface area of 150 acres and a normal storage capacity of 1,476 acre-feet. In 2007, mechanical modifications were made to the dam, highlighting ongoing efforts to ensure its safety and functionality.

Located in Middletown Township, Core Creek is a significant water resource in the region, providing both flood protection and recreational opportunities for the community. With regular state inspections and enforcement in place, the dam continues to play a crucial role in managing water resources and mitigating flood risks in the area.