Big Evans Gulch No. 2, also known as Mountain Lake, is a private water supply dam located in Lake County, Colorado. Built in 1889, this earth dam stands at a height of 31 feet and has a storage capacity of 269 acre-feet. Situated on Evans Gulch, this dam serves the primary purpose of water supply, with a normal storage capacity of 189 acre-feet and a maximum discharge of 1570 cubic feet per second.

With a significant hazard potential and a fair condition assessment, Big Evans Gulch No. 2 is regulated by the Colorado Department of Water Resources, with state permitting, inspection, and enforcement in place. The spillway, which is uncontrolled, has a width of 30 feet, and the dam itself spans 691 feet in length, covering a surface area of 17 acres. Despite its age, this dam has seen moderate risk management measures implemented, with a two-year inspection frequency to ensure its continued safety and reliability for the surrounding area.

For water resource and climate enthusiasts, Big Evans Gulch No. 2 offers a fascinating glimpse into historic dam construction and water management practices in Colorado. With its picturesque location in the mountains near Leadville, this dam stands as a testament to the importance of water supply infrastructure in the region. As efforts continue to ensure its safety and effectiveness, this dam serves as a vital piece of Colorado's water resource puzzle, contributing to the sustainable management of water for both human consumption and environmental needs.