Magleby is a privately owned dam located in Sevier County, Utah, along Monroe Creek. Completed in 1915, this Earth-type dam serves primarily for irrigation purposes, with a storage capacity of 80 acre-feet. The dam stands at a structural height of 18 feet, with a hydraulic height of 16 feet, and a length of 305 feet. Despite not having a hazard potential rating or condition assessment, the Utah Division of Water Rights regulates and inspects Magleby regularly to ensure its safety and compliance.

Situated in the city of Greenwich, Magleby is a significant water resource in the region, supporting agricultural activities and water distribution. Being state-regulated and permitted, the dam undergoes inspections every two years, with the last one conducted in July 2020. Its location within the Los Angeles District and under the jurisdiction of the Utah Division of Water Rights highlights the importance of maintaining its structural integrity and functionality to meet the irrigation needs of the area.

With its historical significance dating back over a century, Magleby continues to play a vital role in the water management infrastructure of Sevier County, Utah. As a key component for irrigation purposes, the dam contributes to the sustainability of agricultural practices in the region. Regular inspections and state oversight ensure the safety and reliability of Magleby, reinforcing its importance in water resource management and climate resilience efforts in the area.