Winchester, located in Johnson County, Wyoming, is a private irrigation dam on the Gassett Draw river. Built in 1961, this earth dam stands at a height of 35 feet and has a storage capacity of 566 acre-feet, primarily used for irrigation purposes. Despite its low hazard potential, Winchester is currently assessed to be in poor condition, with its last inspection in August 2019 revealing the need for maintenance and repairs.

The dam's spillway, of uncontrolled type with a width of 50 feet, poses a moderate risk according to the latest assessment. While Winchester has state permitting, inspection, and enforcement in place, its condition raises concerns for potential risks in the future. With Liz Cheney as the Congressional Representative overseeing this area, it is essential for water resource and climate enthusiasts to monitor and advocate for the maintenance and improvement of Winchester to ensure the safety and sustainability of its operations.

As a key structure for irrigation in the region, Winchester plays a crucial role in water resource management. Given its location in a state known for its natural beauty and ecological diversity, the conservation and upkeep of Winchester are vital for preserving the delicate balance of the local ecosystem. By staying informed and actively engaging in discussions surrounding Winchester's condition and maintenance, enthusiasts can contribute to the long-term resilience and sustainability of water resources in Wyoming.