Located in Richfield, Utah, the Cottonwood Wash Detention Basin is a crucial infrastructure designed for flood risk reduction along the Cottonwood Wash river. Owned and regulated by the Utah Division of Water Rights, this local government-operated detention basin was completed in 1986 and has a hydraulic height of 45 feet, with a structural height of 50 feet. With a storage capacity of 820 acre-feet and a drainage area of 20 square miles, this earth-type dam plays a vital role in protecting the surrounding area from potential flooding events.

The Cottonwood Wash Detention Basin has a high hazard potential but is currently assessed to be in satisfactory condition, as of the last inspection in May 2020. The basin operates under the oversight of the Utah Division of Water Rights, ensuring regular inspections and enforcement of safety measures. With a primary purpose of flood risk reduction, this structure serves as a critical line of defense against flooding in the region. The basin's location at 24,23S~3W SL makes it a key asset in the flood management infrastructure of Sevier County, Utah.

With a maximum discharge capacity of 194 cubic feet per second, the Cottonwood Wash Detention Basin stands as a testament to effective water resource management in the face of climatic challenges. Its strategic design and operational efficiency highlight the importance of proactive flood risk reduction measures in safeguarding communities and infrastructure against the impacts of extreme weather events. As climate change continues to pose threats to water resources, the role of structures like the Cottonwood Wash Detention Basin becomes increasingly vital in ensuring resilience and safety for the residents of Richfield and the surrounding areas.