Johnson No. 1 is a private irrigation dam located in Niobrara, Wyoming, along the Hancock Draw river. Built in 1916, this Earth dam stands at 30 feet high and spans 460 feet in length, providing essential water storage for agricultural purposes. Despite its age, the dam has a low hazard potential but is in poor condition, highlighting the need for maintenance and upkeep to ensure its continued functionality.

With a normal storage capacity of 239 acre-feet and a maximum storage of 333 acre-feet, Johnson No. 1 plays a crucial role in supporting local irrigation needs. The dam features an uncontrolled spillway with a width of 50 feet and two other controlled outlet gates. However, its last inspection in May 2017 revealed a poor condition assessment, indicating the importance of regular maintenance and risk management to prevent potential failures and protect downstream areas.

While Johnson No. 1 is not currently considered a high-risk structure, its moderate risk assessment serves as a reminder of the ongoing challenges faced by aging infrastructure in the face of changing climate conditions. As water resources and climate enthusiasts, it is essential to prioritize the maintenance and management of dams like Johnson No. 1 to ensure the resilience and sustainability of our water systems for future generations.