Box Springs #4, located in Las Animas, Colorado, is a privately owned earth dam completed in 1901 for fire protection, stock, and small fish pond purposes. The dam stands at a height of 10 feet with a length of 6100 feet, providing a storage capacity of 1071 acre-feet. Despite its low hazard potential and fair condition assessment, the dam is deemed to have a high risk due to its location and potential impact on the surrounding area.

Managed by the Colorado Department of Water Resources, Box Springs #4 is regulated, permitted, inspected, and enforced by the state agency. The dam, situated on Horse Creek-OS, has a maximum discharge of 4100 cubic feet per second and a normal storage of 555 acre-feet. Although the dam lacks a spillway, it has a spillway width of 300 feet to handle excess water during peak flow events. The last inspection in 2012 indicated a fair condition, with an inspection frequency of 6 years.

Despite its age, Box Springs #4 continues to serve its primary purposes efficiently. Water resource and climate enthusiasts will find the dam's historical significance and functional design intriguing, making it a noteworthy structure in the water management landscape of Crowley County, Colorado. The dam's ability to balance fire protection, stock maintenance, and irrigation needs underscores its importance in sustaining the local ecosystem and agricultural activities in the region.