How big is the summit of the Tower? It's approximately 1 1/2 acres, about 180 feet by 300 feet. (About the size of a football field.) What is it like on top? The summit is slightly dome shaped and rocky, with native grasses, cactus, and sagebrush. Chipmunks, mice, pack rats and the occasional snake are found on top. How far is it around the Tower? The circumference of the base of the Tower is 1 mile. The Tower Trail is 1.3 miles (2 kilometers).