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{{Short description|Hot spring in Yellowstone National Park, US}}
{{Infobox hot spring
| name = Emerald Spring
| name_origin = [[Philetus Norris]], park superintendent (1877-82)
| location = Norris Geyser Basin, Yellowstone National Park, [[Park County, Wyoming]]
| coordinates = {{coord|44.725665|-110.704276|region:US-WY|format=dec|display=inline,title}}<ref name="rcn">{{cite rcn|id=6266|name=Emerald Spring}}</ref>
| elevation = {{convert|8448|ft|m}}<ref>{{cite gnis|1609415|Emerald Spring}}</ref>
| hot_spring_type = Hot Spring
| height =
| duration =
| frequency =
| discharge =
| temperature = {{convert|83.3|C|F}}<ref name="rcn"/>
| depth = {{convert|27|ft|m}}
| map_image = NorrisGeyserBasin-Emerald Spring.JPG
| map_caption = Norris Geyser Basin
| map_width =
}}

'''Emerald Spring''' is a [[hot spring]] located in [[Norris Geyser Basin]] of [[Yellowstone National Park]].

==History==
[[File:Emerald spring.jpg|thumb|left|Emerald Spring, 1989]]

Originally named ''Emerald Geyser'' by [[Philetus Norris]], park superintendent (1877–1882) because of its color, the name was later officially changed to ''Emerald Spring'' by the U.S. Geological Survey in 1930.<ref>{{cite book |last=Haines |first=Aubrey L. |title=Yellowstone Place Names-Mirrors of History |publisher=University Press of Colorado |location=Niwot, CO |year=1996 |isbn=0-87081-383-8 |pages=148}}</ref>

In 1892 [[Robert W. Wood]], an American optical physicist, used the spring for a [[prank]]. He stealthy dissolved a pint of [[fluorescein]] in the pool to surprise several witnesses with unusually [[colorfulness|colorful]] water.<ref>{{cite book | title=Doctor Wood, Modern Wizard of the Laboratory | authorlink=William Seabrook | author=Seabrook, W. | year=1941 | location=New York | publisher=Harcourt Brace |chapter=Alarms, excursions, and explosions at Johns Hopkins ending in early marriage and a job at the University of Chicago}}</ref>

==Characteristics==
Emerald Spring is {{convert|27|ft|m}} deep.<ref name="nps">{{cite web |title=Emerald Spring |work=Yellowstone Online Tours |publisher=National Park Service |url=http://mms.nps.gov/yell/features/norristour/emerald.htm |url-status=dead |archiveurl=https://web.archive.org/web/20100518091652/http://mms.nps.gov/yell/features/norristour/emerald.htm |archivedate=2010-05-18 }}</ref> The water temperature in the spring is around {{convert|83.3|C|F}}.<ref name="rcn"/> The spring gets its name from the emerald green color of the water created by sunlight filtering through the water, giving the light a blue color, and reflecting off the yellow sulphur creating the green hue.<ref name="nps"/>

While Emerald Spring is a mostly calm pool, which usually only has a few bubbles rising to the surface, it does experience periods of turbidity and small 3-foot (1-m) high eruptions. In 1931, Emerald experienced a period of extremely vigorous activity with eruptions measuring 60 to 75 feet (18.2–22.9 m) in height.<ref>{{cite web |title=Emerald Spring |publisher=Geyser Observation and Study Association (GOSA) |url=http://geyserstudy.org/geyser.aspx?pGeyserNo=EMERALDSPRING}}</ref>

==References==
{{reflist}}

==External links==
* {{cite web |last=Ball |first=James W. |author2=Nordstrom, D. Kirk |author3=McCleskey, R. Blaine |author4=Schoonen, Martin A. A. |author5= Xu, Yong |year=2001 |page=26 |url=http://wwwbrr.cr.usgs.gov/projects/GWC_chemtherm/pubs/ofr%2001-49.pdf#page=31 |title=Water-Chemistry and On-Site Sulfur-Speciation Data for Selected Springs in Yellowstone National Park, Wyoming,1996-1998 |publisher=U.S. Geological Survey}}

{{Norris Madison}}
{{Wyoming}}

[[Category:Geothermal features of Yellowstone National Park]]
[[Category:Geothermal features of Park County, Wyoming]]
[[Category:Hot springs of Wyoming]]
[[Category:Bodies of water of Park County, Wyoming]]

Emerald Spring - Revision history

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