Lost Canyon is a private irrigation dam located in Montezuma County, Colorado. Completed in 1965, this earth dam stands at a height of 25 feet and has a maximum storage capacity of 260 acre-feet. The primary purpose of Lost Canyon is irrigation, although it also serves for fire protection, stock, small fish ponds, and water supply.

Despite being classified as having a low hazard potential and fair condition assessment, Lost Canyon is subject to state regulation, inspection, and enforcement. The dam features an uncontrolled spillway and a single slide (sluice gate) outlet structure. With a moderate risk rating of 3, there is a need for ongoing risk management measures to ensure the safety and integrity of the structure.

Located on the Lost Canyon-TR stream, this dam plays a crucial role in water resource management in the area. Enthusiasts interested in water resources and climate will find Lost Canyon a compelling site to study the intersection of human infrastructure and natural systems in the context of irrigation and water supply management.