Morgan, located in Napa, California, is a privately owned dam that serves multiple purposes, including flood risk reduction, irrigation, and water supply. Built with an earth core, Morgan stands at 34 feet high with a hydraulic height of 30 feet, and a length of 620 feet. Its storage capacity reaches up to 94 acre-feet, covering a surface area of 6 acres and draining a 0.14 square mile watershed.

Despite its low hazard potential, Morgan is under the regulatory oversight of the California Department of Water Resources (DWR) for safety inspections and enforcement. The dam has been deemed to be in satisfactory condition as of September 2017, with regular inspections conducted every 1 year to ensure its structural integrity. In the event of an emergency, the dam's emergency action plan (EAP) status and risk management measures remain unspecified, suggesting a need for further preparedness.

As a vital component in managing the water resources of the Tr Gordon Val Cr river system, Morgan plays a crucial role in mitigating flood risks and providing essential water supplies to the surrounding area. Its strategic location in Mankas Corner, coupled with its multiple functions, highlights the importance of maintaining and monitoring this structure to ensure the safety and sustainability of water resources in the region.