O Bar O No. 3 is a privately owned earth dam located in Torrington, Wyoming, with a primary purpose of irrigation. Completed in 1970, this structure stands at 33 feet high and 360 feet long, with a storage capacity of 182 acre-feet. Situated on Grays Run and Sybille Creek offstream, this dam serves multiple purposes including fire protection, stock watering, and small fish pond management. Despite being classified as having a low hazard potential, the dam is regularly inspected and maintained to ensure its fair condition.

Managed by the Wyoming State Engineer's Office, O Bar O No. 3 is equipped with an uncontrolled spillway and outlet gates. The dam's risk assessment has been rated as moderate, indicating the need for ongoing risk management measures. With Liz Cheney representing Congressional District 00 in Wyoming, this structure plays a crucial role in enhancing water resource management and climate resilience in the Platte County area. Water resource and climate enthusiasts will find O Bar O No. 3 to be an intriguing example of sustainable infrastructure supporting agricultural activities in the region.