{{Use American English|date=March 2025}} {{Use mdy dates|date=February 2025}} [[File:Ayres Natural Bridge Park, Wyoming.jpg|thumb|right|250px|Ayres Natural Bridge over LaPrele Creek]] '''Ayres Natural Bridge Park''' is a county park in [[Converse County, Wyoming|Converse County]], [[Wyoming]] in the [[United States]]. It occupies 150 acres (0.6 km²) between the towns [[Glenrock, Wyoming|Glenrock]] and [[Douglas, Wyoming|Douglas]] about 6 kilometers south of [[Interstate 25]] exit 151. The park's name is derived from the rock formation of the same name. Ayres is the surname of the family who donated the land which had been part of their ranch.
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 [[stream|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. 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."
The park is free to visit. There is a small campground in the park, as well as open picnic areas and covered tables. It is opened from April 15 through October 15, from 8 a.m. to 8 p.m., with registered campers allowed to stay overnight. No pets are allowed in the park.
[[File:Ayres Natural Bridge power house.jpg|thumb|right|250px|View from the natural bridge to the LaPrele Creek and the old power house]] 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. The company went bankrupt before the project was completed.
== External links == * {{cite web | year = 2005 | url = http://www.conversecounty.org/community/recreation.activities.htm#4 | title = Converse County Recreation | accessdate = May 16, 2006 | archive-url = https://web.archive.org/web/20070501180401/http://conversecounty.org/community/recreation.activities.htm#4 | archive-date = May 1, 2007 | url-status = dead }} * {{cite gnis |id=1679050 |name=Ayres Natural Bridge}}
{{Commons category|Ayres Natural Bridge Park}}
{{coord|42.734134|-105.612216|region:US_type:landmark|display=title}}
{{Protected Areas of Wyoming}}
[[Category:Parks in Wyoming]] [[Category:Natural arches of Wyoming]] [[Category:Oregon Trail]] [[Category:Protected areas of Converse County, Wyoming]] [[Category:Landforms of Converse County, Wyoming]]