Upper is a privately owned irrigation dam located in Washakie, Wyoming, near the city of Manderson. Built in 1922, this Earth dam stands at a height of 15 feet and has a storage capacity of 373 acre-feet. The dam, designed by C.D. Shawer, is primarily used for irrigation purposes and is regulated by the State Engineer's Office.

Despite being categorized as having a low hazard potential and fair condition assessment, Upper poses a moderate risk due to its location on Spring Branch Brokenback Creek. The spillway, which is uncontrolled and 20 feet wide, is designed to handle any excess water flow. The dam is equipped with two valve outlet gates and undergoes regular inspections every five years to ensure its structural integrity.

In the event of an emergency, the dam does not have an Emergency Action Plan (EAP) in place, raising concerns about its emergency preparedness. However, with its moderate risk level and fair condition assessment, it is crucial for authorities to monitor and address any potential issues to ensure the safety and functionality of Upper for both irrigation and water resource management in the region.