......Over the course of millions of years, a bend in LaPrele Creek (originally known as Bridge Creek)
wore away at a wall of solid rock, creating a natural opening.
The creek eventually shifted course through the opening, forming a 30-foot (10 m) high and 50-foot (15 m)
wide arch, today known as
Ayres Natural Bridge. Located about a mile (2 km) south of the Oregon Trail, the Natural Bridge was often
visited by emigrants traveling west. It is considered one of Wyoming's first tourist attractions.
In 1843, a pioneer described it as "a natural bridge of solid rock, over a rapid torrent,
the arch being regular as tho' shaped by art."