The Alva B. Adams Tunnel is a significant water diversion tunnel located in Colorado, USA. It was constructed to transport water from the Colorado River to the Front Range of Colorado, helping to supply water for agricultural and municipal use. The tunnel is named after Alva B. Adams, a former governor of Colorado who played a key role in its development. Completed in 1947, the tunnel spans approximately 13 miles and is part of the Colorado-Big Thompson Project. This project aims to manage water resources in the region, ensuring a reliable supply for various needs. The tunnel remains an essential infrastructure component for water distribution in Colorado.