Casper Sage Creek, also known as City Reservoir, is a significant water resource in Natrona, Wyoming, owned and regulated by the local government. Built in 1952, this Earth-type dam on Sage Creek serves primarily for irrigation purposes, with a storage capacity of 165 acre-feet and a surface area of 11 acres. The dam stands at a height of 40 feet, with a spillway width of 45 feet to manage maximum discharge levels.

Maintaining a fair condition assessment, with a significant hazard potential, Casper Sage Creek underwent its last inspection in April 2017. The dam features a single vertical lift outlet gate and operates under uncontrolled spillway conditions. With a moderate risk rating, the dam is located in a picturesque setting, with Liz Cheney as the congressional representative for the area. Water and climate enthusiasts can appreciate the engineering and management challenges involved in sustaining this vital water resource.

As a focal point for water management in the area, Casper Sage Creek requires regular inspection and maintenance to ensure its continued function and safety. With its location in a scenic natural setting and the critical role it plays in irrigation, this dam on Sage Creek serves as a reminder of the importance of sustainable water resource management in the face of changing climate conditions.