Horn, located in Johnson County, Wyoming, is a privately owned Earth dam on Horn Creek completed in 1956 for irrigation purposes. Standing at a height of 45 feet with a hydraulic height of 40 feet, this structure has a storage capacity of 270 acre-feet and covers a surface area of 15 acres. Despite its low hazard potential, the dam is assessed to be in poor condition, with its last inspection in August 2018 revealing the need for maintenance and improvements.

The dam features an uncontrolled spillway with a width of 60 feet and an outlet gate consisting of a slide (sluice gate). While it has not been modified in recent years, its risk assessment categorizes it as moderate (3) in terms of potential hazards. The surrounding area is at a low risk of inundation, and the dam is under state jurisdiction for regulation, permitting, inspection, and enforcement, ensuring compliance with safety standards and protocols.

In the event of an emergency, the dam lacks an Emergency Action Plan (EAP) and updated contact information, highlighting the need for proactive measures to mitigate risks and ensure the safety of downstream communities. With a capacity to store water for irrigation purposes, Horn plays a crucial role in water resource management in the region, making it essential to address its maintenance needs and enhance its resilience to changing climate conditions.