Barnes Butte
{{Short description|Dome of volcanic rock in Crook County, Oregon, United States}}
{{Use mdy dates|date=January 2025}}{{Infobox mountain
| name = Barnes Butte
| photo = Barnes Butte near Prineville, Oregon (13999908157).jpg
| photo_caption = The north slope of Barnes Butte with Barnes Butte Reservoir below.
| elevation_ft = 3,549
| prominence =
| map =
| map_caption = none
| location = Crook County, Oregon, U.S.
| range =
| coordinates = {{coord|44|19|07|N|120|48|38|W|type:mountain_region:US-OR|display=inline,title}}
| range_coordinates =
| coordinates_ref =
| topo =
| type =
| volcanic_arc =
| last_eruption =
| first_ascent =
| easiest_route =
}}
Barnes Butte is a rhyolite dome of volcanic rock in Crook County, Oregon, United States located partly within the city of Prineville. Barnes Butte is composed of welded tuff and is a part of the Crooked River caldera.{{cite web|url=http://www.oregongeology.org/pubs/og/OGv69n01-Neogenestrat.pdf|title=Field trip guide to the Neogene stratigraphy of the Lower Crooked Basin and the ancestral Crooked River, Crook County, Oregon|website=OregonGeology.org|accessdate=2017-12-28}} It was the site of a 1940s mercury mine.
{{cite web
| url = http://www.oregongeology.org/pubs/og/OGv69n01.pdf
| title = Field trip guide to the Oligocene Crooked River caldera: Central Oregon's Supervolcano, Crook, Deschutes, and Jefferson Counties, Oregon
| website = OregonGeology.org
| publisher = Oregon Department of Geology and Mineral Studies
| date = 2009
| accessdate = 2014-12-29}} In 2015, a BLM cleanup of mercury was done to reduce the health risk to residents of nearby IronHorse neighborhood and the Barnes Butte Elementary School.{{cite web|url=http://www.oregonlive.com/pacific-northwest-news/index.ssf/2015/06/blm_launches_mercury_cleanup_a.html|title=BLM launches mercury cleanup at Barnes Butte|website=Oregonlive.com|accessdate=2017-12-28}}
The butte is a recreational area and includes the IronHorse hiking trail, a {{convert|4|mi|adj=on}} loop that includes a hike to the summit.{{cite web|url=http://www.ironhorseprineville.com/ironhorse-community/ironhorse-maps/the-ironhorse-trail/|title=The IronHorse Trail Map|website=ironhorseprineville.com|accessdate=2017-12-28}}
The butte is considered one of three popular landmarks near Prineville and has been set aside for scenic preservation.{{cite web|url=http://www.co.crook.or.us/Portals/0/Crook_County_-_Comprehensive_Plan.pdf|title=Crook County Comprehensive Plan - Adopted 1978, Codified January, 2003|website=Co.Crook.Or.Us|accessdate=2017-12-28}}