Located in Larimer County, Colorado, Rattlesnake (also known as Pinewood Lake) is a federal-owned dam with a primary purpose of irrigation. Constructed in 1952 by the Bureau of Reclamation, this rockfill dam stands at a height of 130 feet and has a storage capacity of 3,179 acre-feet. The dam regulates Rattlesnake Creek and Cottonwood Creek-TR, providing essential water resources for agricultural needs in the region.

With a drainage area of 4 square miles and a surface area of 124 acres, Rattlesnake Dam plays a crucial role in water management in the area. Despite its high hazard potential and high risk assessment, the dam's condition assessment is currently not available. The Bureau of Reclamation oversees the operations, inspections, and regulatory aspects of the dam, ensuring its safety and functionality. For water resource and climate enthusiasts, Rattlesnake Dam represents a vital infrastructure supporting irrigation and water supply in the region.