Harquahala Flood Retarding Structure (FRS) is a vital infrastructure owned by the local government in Maricopa, Arizona, designed by the USDA NRCS and regulated by the Arizona Department of Water Resources. Completed in 1982, this Earth-type dam stands at a height of 38 feet and spans a length of 62,308 feet, with a storage capacity of 8,000 acre-feet. Situated along the Bouse Wash - TR stream, the dam serves the primary purpose of flood risk reduction and covers a surface area of 1,180 acres.

Despite its satisfactory condition assessment, Harquahala FRS has a high hazard potential, indicating its critical role in mitigating flood risks in the region. The dam features an uncontrolled spillway with a width of 150 feet and operates without outlet gates. Regular inspections are conducted, with the last inspection performed in November 2020. While the risk assessment deems it moderate, the dam's risk management measures and emergency preparedness plans are not specified in the available data.

Located in an area prone to flooding, Harquahala FRS stands as a key component of water resource management in the region, highlighting the importance of its design, regulation, and maintenance in ensuring the safety and sustainability of local communities and ecosystems.