222 
NATURAL BRIDGES OF UTAH 
Measured from the angle of development, the Carolyn Bridge is 
by far the youngest of the three (plate xiii, B). The archway 
is comparatively small and the bridge itself is heavy and massive. 
The span of the arch, measured from abutment to abutment, 
is 186 feet. The bottom of the arch is ninety-eight feet above 
the stream-bed; and the height of the bridge, measured over all, 
is 205 feet. The width of the roadway is 49 feet; and the depth 
of the arch is 107 feet. 
Next in order of development is the incomparable Augusta 
Bridge, whose span is 261 feet, and whose height to the bojWom 
of the arch is 157 feet. The total height from the creek bed to 
the top of the bridge is 222 feet. The width of the arch is 28 
feet, and its thickness is 65 feet. Although not nearly so massive 
as the Carolyn Bridge, the Augusta Bridge is superior not only 
in point of size but particularly in the qualities of form and 
symmetry. 
So far as is known this is the largest natural bridge in the 
world. (The Nonnezoshie is an arch.) Its height would permit 
an ordinary fifteen-story business building to stand beneath it. 
The mighty structure, the gorgeously colored rocks and the in¬ 
tense greenness of the vegetation all combine to make the ensemble 
a most impressive sight, and one never to be forgotten. 
The Edwin bridge is the oldest of the three structures (plate 
xii). The bridge itself is chiseled down to a mere skeleton 
of its former massiveness. The thickness of the spanning column 
is slightly less than ten feet at its middle point, and not more 
than 25 feet in width. The arch has a span of 194 feet, and an 
elevation of 108 feet. The whole structure is so slender as to 
give one the impression of great insecurity, but, of course, barring 
some unlooked for cataclysm, it will probably not collapse for 
many centuries (plate xv). 
The three bridges constitute a nearly perfect series showing the 
normal sequence of development. The Carolyn Bridge is still in 
its early formative period. The sublime Augusta Bridge is at 
its prime (plate xiv, B). The Edwin Bridge already reaches 
its old age, and while observers feel that this bridge excells the 
others in point of grace and beauty, yet it cannot be denied that 
the centuries of its existence are rapidly drawing to a close. 
Actuated by the hope that somewhere in the vicinity of the 
