Summit - Main Dam, located in Dolores, Colorado, is a privately owned structure primarily used for irrigation purposes along the Lost Canyon Creek. Built in 1905, this earth dam stands at a height of 42 feet and stretches over 7,270 feet in length. With a maximum storage capacity of 7,050 acre-feet and a normal storage of 5,954 acre-feet, this dam plays a crucial role in water resource management in the region.

Despite being classified as a high hazard potential structure, Summit - Main Dam is currently assessed to be in fair condition as of October 2020. The dam features an uncontrolled spillway with a width of 40 feet and a slide gate for outlet control. It is subject to regular inspections, with a frequency of one inspection per year to ensure its structural integrity and safety. The risk assessment for this dam is moderate, indicating the importance of ongoing monitoring and risk management measures.

In addition to its irrigation function, Summit - Main Dam also serves as a fish and wildlife pond for recreational purposes. Situated in Montezuma County, this dam stands as a testament to early 20th-century water resource development in Colorado. As climate change impacts water availability and quality in the region, structures like Summit - Main Dam will continue to play a vital role in sustaining agriculture, wildlife, and recreational activities in the area.