Warren St Detention, located in Mankato, Minnesota, is a crucial earth dam structure designed by BARR ENG to manage flood risk along the Minnesota River. Completed in 1997, this dam stands at a height of 45 feet and spans 150 feet in length, with a primary purpose of flood risk reduction. With a storage capacity of 30 acre-feet and a normal storage level of 1.6 feet, the dam plays a vital role in protecting the surrounding Blue Earth County area from potential flooding events.

The structure's hazard potential is classified as low, with a fair condition assessment as of June 2016. The dam features an uncontrolled spillway type with a width of 6 feet, allowing for a maximum discharge of 50 cubic feet per second. Despite its moderate risk rating, Warren St Detention has not been modified in recent years and has demonstrated its effectiveness in managing floodwaters. The dam is inspected every four years to ensure its continued functionality and safety for the community.

Owned and regulated by the local government with oversight from the Minnesota Department of Natural Resources, Warren St Detention serves as a critical infrastructure asset for flood control in the region. Its strategic location and design make it a key component in the overall water resource management system along the Minnesota River, contributing to the resilience of the area against potential climate-related challenges.