Greybull Sewage Treatment Lagoon, located in Greybull, Wyoming, is a crucial facility owned by the local government and regulated by the Wyoming State Environmental Quality Office. Designed by Thomas D. Crank and completed in 1960, this Earth-type dam stands at a height of 8 feet and has a storage capacity of 152 acre-feet. The lagoon serves as an offstream water resource for the area, with a surface area of 31 acres and a drainage area of 0.

Despite its satisfactory condition assessment, the Greybull Sewage Treatment Lagoon poses a significant hazard potential, with a high risk rating of 2. The facility is inspected every five years, with the last inspection taking place in May 2020. It features controlled outlet gates and no spillway, emphasizing the need for efficient management and maintenance to prevent any potential risks or emergencies. Overall, Greybull Sewage Treatment Lagoon plays a vital role in managing sewage and wastewater in the region, highlighting the importance of water resource infrastructure for environmental protection and public health.