Grand Mesa #9, also known as Ternahan, is a privately owned irrigation dam located in Grand Junction, Colorado. Completed in 1904, this earth dam stands at a height of 15 feet and has a length of 600 feet, providing essential water storage for irrigation purposes. The dam has a storage capacity of 268 acre-feet and is situated on the Kahnah Creek, within a drainage area of 4 square miles.

Despite its age, Grand Mesa #9 is rated as having a low hazard potential and fair condition assessment. The dam is not equipped with a spillway, but instead has slide and uncontrolled gates for water release. Regular inspections are performed, with the last assessment conducted in August 2019. The risk assessment for the dam indicates a high risk level of 2, prompting the need for continued monitoring and management measures to ensure its safety and functionality for the surrounding area.

Grand Mesa #9 serves as a vital component of the local water resource infrastructure, contributing to the irrigation needs of the region. With its historical significance and ongoing importance for agricultural activities, this dam exemplifies the intersection of water management and climate resilience in the dynamic landscape of Colorado. As water resource and climate enthusiasts, the data behind Grand Mesa #9 offers a compelling glimpse into the intricate balance of human intervention and natural processes in sustaining vital water supplies for the community.