Ayres Natural Bridge Park

It occupies 150 acres (0.6 km²) between the towns Glenrock and Douglas about 6 kilometers south of Interstate 25 exit 151.

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, from sandstones of the Casper Formation.

Located about a mile (2 km) south of the Oregon Trail, the Natural Bridge was often visited by emigrants traveling west.

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."

At the park entrance, the old power house, a gray concrete building from the early 1900s build by North Platte Irrigation Company to supply power to pump water from North Platte River for irrigation is still preserved.