Cooper is a privately owned earth dam located in Natrona County, Wyoming, and was completed in 1933 by L.S. Worthington. This structure serves multiple purposes, including fire protection, stock, and a small fish pond, with a capacity to store up to 232 acre-feet of water. The dam stands at a height of 16 feet and has a spillway width of 25 feet, with a low hazard potential and fair condition assessment.

Situated on a branch of the South Powder River, Cooper dam plays a crucial role in providing water for various uses in the area. Despite being regulated by the state and undergoing regular inspections, the dam's risk assessment is rated as moderate. The surrounding area, including the city of Arvada, benefits from the water storage and protection provided by Cooper dam, ensuring a stable water supply for fire emergencies, livestock, and recreational purposes.

As climate change impacts water resources, Cooper dam remains a vital piece of infrastructure in Wyoming. With its historical significance and contribution to local water management, enthusiasts of water resources and climate change can appreciate the role that Cooper plays in ensuring water security and environmental sustainability in the region.