Located in Powder River, Wyoming, Ollie Stock is a private earth dam completed in 1963 primarily used for fire protection, stock, or as a small fish pond. With a height of 25 feet and a hydraulic height of 20 feet, the dam has a normal storage capacity of 55 acre-feet and a maximum storage capacity of 91 acre-feet. Despite having a low hazard potential, the dam is categorized as having a fair condition assessment as of its last inspection in July 2017.

The dam is situated on the No. Three Draw river or stream, within the jurisdiction of the state and regulated by the Wyoming State Engineer's Office. With a spillway type of uncontrolled and a spillway width of 59 feet, Ollie Stock covers a surface area of 6 acres and has a drainage area of 0 acres. The risk assessment for the dam is moderate (3), indicating a level of risk management measures in place to mitigate potential hazards.

Ollie Stock, owned and operated by a private entity, is a vital resource for the local community in terms of fire protection and stock water supply. As water resource and climate enthusiasts, it is important to monitor the condition of this dam and ensure that proper maintenance and inspection protocols are followed to safeguard against any potential risks or emergencies that may arise in the future.