SR 266 has a spur route that heads north from the highway to the prison at Fort Grant just prior to the highway's western terminus. SR 266 travels through sparsely populated areas and does not pass through any cities or towns. It serves primarily as an access road to Fort Grant.
SR 266 contains a branch route that leads north from the highway to the prison at Fort Grant, just before reaching the highway's western end. This route moves through sparsely populated regions and does not pass through any cities or towns. It primarily functions as an access road to Fort Grant.