Margaret No.2 is a private earth dam located in Johnson, Wyoming, along the Jennie Draw stream. Built in 2004 by designer Hugh Lowham, this structure serves primarily for irrigation purposes, with additional benefits for fire protection, stock, and small fish pond. The dam stands at 30 feet tall with a hydraulic height of 22 feet, offering a maximum storage capacity of 38 acre-feet and covering a surface area of 2.1 acres. Despite its low hazard potential and fair condition assessment, Margaret No.2 undergoes regular inspections every 5 years to ensure its structural integrity and compliance with state regulations.

Managed by the Wyoming State Engineer's Office and Department of Environmental Quality, Margaret No.2 is subject to state permitting, inspection, and enforcement protocols to safeguard its operation and surrounding environment. The dam features an uncontrolled spillway with a width of 60 feet and is equipped with a single valve outlet gate for water discharge control. With a moderate risk assessment rating of 3, the structure is deemed to have potential risks that require ongoing monitoring and risk management measures. Although located in a remote area off County Road, this dam plays a crucial role in supporting local agriculture and water resource management in the region.

In the event of an emergency, Margaret No.2 has designated emergency contacts for swift response, although the details of the Emergency Action Plan (EAP) are currently unspecified. The structure's overall risk management approach and adherence to guidelines remain undisclosed, highlighting the need for further assessment and preparation for potential inundation scenarios. As a key irrigation asset in the Omaha District, Margaret No.2 stands as a vital component of the regional water infrastructure, showcasing the intersection of human intervention with natural water systems for sustainable resource utilization and climate resilience.