Holden, also known as Jack Holden, is a private water resource structure located in McCoy, Colorado. This dam, completed in 1952, serves primarily for irrigation purposes but also supports other water supply needs in the area. With a height of 15 feet and a length of 408 feet, Holden has a storage capacity of 55 acre-feet and a maximum discharge rate of 94 cubic feet per second.

The dam is built using earth and stone materials, with foundations consisting of rock and soil. It has undergone modifications in 2003 to enhance its hydraulic, mechanical, and structural aspects. Despite being classified as having low hazard potential, Holden's condition assessment as of September 2019 was deemed unsatisfactory. It is regularly inspected every 6 years to assess its safety and functionality, with a moderate risk level indicated.

Located on Egeria Creek in Routt County, Holden plays a crucial role in water management and supply in the region. As a state-regulated structure, it falls under the oversight of the Colorado Division of Water Resources, ensuring that it meets regulatory standards for inspection, enforcement, and permitting. With its strategic location and importance for irrigation and water supply, Holden remains a key asset for sustaining water resources in the area while facing ongoing challenges in maintaining its structural integrity and operational effectiveness.