Located in Crook, Wyoming, the Orr dam, also known as Spring Branch, was completed in 1976 and serves primarily for irrigation purposes. Designed by John R. Long, this privately owned earth dam stands at a height of 33 feet, with a hydraulic height of 28 feet and a length of 1635 feet. With a storage capacity of 739 acre-feet and a surface area of 58 acres, the Orr dam plays a crucial role in water management in the area.

Despite being rated with a low hazard potential, the Orr dam is regularly inspected and maintained to ensure its structural integrity. The dam's condition assessment in 2019 deemed it to be in fair condition, with a moderate risk level. While it has uncontrolled spillways and no outlet gates, the dam's risk management measures and emergency preparedness protocols are being continuously updated to meet regulatory guidelines.

The Orr dam stands as a vital water resource structure in Wyoming, contributing to irrigation, fire protection, and stock maintenance. With its strategic location on Spring Branch, the dam plays a crucial role in water distribution and management in the region. As climate change continues to impact water resources, maintaining and monitoring dams like Orr becomes increasingly important for sustainable water management practices.