Arlington Detention is a local government-owned earth dam located in St. Paul, Minnesota, designed by SEH ENG to primarily reduce flood risk along Phalen Creek. Completed in 1989, this significant structure stands at a height of 15 feet and spans 735 feet in length, with a storage capacity of 50 acre-feet and a maximum discharge rate of 1800 cubic feet per second. Despite its age, the dam is in satisfactory condition as of the latest assessment in 2015, with a moderate risk rating.

Managed by the Minnesota Department of Natural Resources, Arlington Detention plays a crucial role in flood risk reduction within Ramsey County. The dam's uncontrolled spillway and buttress core type contribute to its effective operation, ensuring the safety of surrounding communities in the event of heavy rainfall or rising water levels. Regular inspections are conducted every four years to monitor the structure's integrity and prepare for any potential emergencies.

With a hazard potential classified as significant, Arlington Detention remains a key asset in the region's water resource management efforts. Its location, design, and functionality underscore the importance of proactive maintenance and risk management measures to safeguard against potential threats and ensure the continued protection of nearby residents and infrastructure. For water resource and climate enthusiasts, Arlington Detention serves as a prime example of how strategic infrastructure plays a vital role in mitigating natural disasters and enhancing community resilience in the face of changing environmental conditions.