Mary No. 1 is a privately owned earth dam located in Carbon County, Wyoming, along the North Fork Watkins Creek. Built in 1948 by designer Jame T Fletcher, this dam serves primarily for irrigation purposes, with a storage capacity of 140 acre-feet and a maximum discharge of 0. The dam stands at a height of 38 feet with a hydraulic height of 35 feet, stretching 450 feet in length. Despite its low hazard potential, the dam is currently assessed to be in poor condition, highlighting the need for maintenance and improvements.

With its uncontrolled spillway and one outlet valve, Mary No. 1 has a surface area of 10 acres and serves as a vital resource for fire protection, stock, and small fish pond irrigation in the region. The dam's condition assessment conducted in July 2021 revealed a moderate risk level (3), prompting the necessity for risk management measures to ensure the safety and functionality of the structure. Despite being state-regulated and permitted, the dam's poor condition underscores the importance of regular inspections and maintenance to mitigate potential risks and ensure its long-term reliability.

As water resource and climate enthusiasts, it is essential to monitor and support the upkeep of crucial infrastructure like Mary No. 1 to sustainably manage water resources and adapt to changing environmental conditions. By recognizing the significance of dams like Mary No. 1 in facilitating irrigation and other essential purposes, we can work towards enhancing their resilience and effectiveness in the face of evolving challenges posed by climate change and water scarcity. With proper maintenance and risk management measures, Mary No. 1 can continue to play a vital role in supporting agricultural activities and ecosystem health in the region.