Chesapeake Ranch Estates Dam, also known as Chisolm Trail or Robert A. Philipson Dam, is a privately-owned structure located in Calvert, Maryland along Mill Creek. Constructed in 1965 by Matz, Childs & Assoc. Inc and Robert B. Balter, this earth dam stands at a height of 46 feet and stretches 640 feet in length, with a maximum storage capacity of 2614 acre-feet and a normal storage of 1534 acre-feet. The dam serves primarily for flood risk reduction purposes and has a spillway width of 82 feet for uncontrolled discharge.

Despite being classified as having a high hazard potential, the dam is currently in fair condition as per the latest assessment in April 2021. Regular inspections by the Maryland Dam Safety agency ensure its safety and regulatory compliance to mitigate any risks. With a moderate risk rating of 3 out of 5, the dam's Emergency Action Plan (EAP) is continuously updated to meet guidelines and address any potential emergencies effectively. Overall, Chesapeake Ranch Estates Dam plays a crucial role in managing water resources and protecting the surrounding communities from flood hazards in the region.