Flathead, located in Washakie, Wyoming, is an irrigation dam constructed in 1979 on the Gomer Gulch river. The dam stands at a height of 40 feet with a hydraulic height of 36 feet and a structural height of 45 feet. Its primary purpose is irrigation, serving the area with a normal storage capacity of 417 acre-feet and a surface area of 29 acres. However, the dam is currently assessed to be in poor condition with a significant hazard potential, pointing to the need for maintenance and upgrades to ensure its safety and functionality.

Managed by private owners, Flathead is subject to state regulations, permitting, inspections, and enforcement. It features an uncontrolled spillway with a width of 90 feet and three valve outlet gates. The dam's risk assessment categorizes it as moderate, highlighting the importance of implementing risk management measures to mitigate potential hazards. The last inspection in November 2017 indicated a need for improvements to bring the dam up to standard, emphasizing the necessity of ongoing monitoring and maintenance to safeguard the surrounding community and water resources.

In addition to its structural details, Flathead's location in Manderson, Wyoming, and its association with the Gomer Gulch river make it a significant water resource for the region. With its historical and hydrological importance, Flathead underscores the intersection of water management, climate resilience, and infrastructure maintenance in sustaining agricultural activities and ecological balance in the area.