Zemba, located in Farson, Wyoming, is a privately-owned earth dam completed in 1915 primarily for irrigation purposes. The dam stands at a height of 16 feet with a hydraulic height of 11 feet and a length of 320 feet. It has a storage capacity of 124 acre-feet, with a normal storage level of 87 acre-feet, serving the Long Draw & Granite Gulch rivers and streams in Sublette County. Despite its age, the dam has a low hazard potential but is assessed to be in poor condition, last inspected in August 2017.
Managed by the Wyoming State Engineer's Office, Zemba features an uncontrolled spillway with a width of 10 feet and a single outlet valve. Its condition assessment indicates a need for maintenance and potential risk management measures to ensure its continued safety and functionality. While it has not been modified in recent years and its inundation maps and emergency action plan status are unclear, Zemba remains a critical water resource infrastructure in the region, supporting agricultural activities and water management in the area.
With its moderate risk level and limited associated structures, Zemba represents a historic yet essential part of the water management system in Wyoming. As climate change impacts continue to affect water resources, ensuring the safety and reliability of dams like Zemba becomes increasingly important for sustainable water management practices and adaptation strategies in the face of changing environmental conditions.
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