Kiewit No. 1, located in Wyoming along the East Pass Creek, is a privately owned earth dam primarily used for irrigation purposes. Completed in 1964, this dam stands at a height of 30 feet and has a storage capacity of 158 acre-feet. With a surface area of 11 acres, Kiewit No. 1 plays a vital role in water resource management in the region.

Despite being classified as a low hazard potential structure with a fair condition assessment, Kiewit No. 1 is subject to state regulation, inspection, and enforcement to ensure its continued safety and functionality. The dam features an uncontrolled spillway with a width of 55 feet and a single slide gate for outlet control. With its hydraulic height matching its structural height at 28 feet, Kiewit No. 1 presents a moderate risk that is continuously monitored and managed by relevant authorities.

Operated under the jurisdiction of the Wyoming State Engineer's Office, Kiewit No. 1 serves as a critical component of the local irrigation infrastructure. With its historical significance dating back to the mid-20th century, this earth dam remains integral to the agricultural activities in the region, showcasing the intersection of water resource management, climate considerations, and sustainable development practices.