On July 1, 1908, by executive order of President Theodore Roosevelt, Ashley National Forest was created. The general boundaries of the Forest remained unchanged until 1953. The entire north slope of the Uinta Mountains was transferred to the Wasatch National Forest, while Ashley National Forest received the Rock Creek and Duchesne River drainages. President Lyndon B. Johnson added approximately to the Forest when he established the Flaming Gorge National Recreation Area as part of Ashley National Forest in 1968. Since then, there have only been slight boundary changes to the Forest.