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Mammoth Spring
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{{Short description|Spring in Arkansas}} {{other uses}} {{Use mdy dates|date=August 2023}} {{more citations needed|date=May 2022}} {{Infobox river | name = Mammoth Spring | native_name = | native_name_lang = | name_other = | name_etymology = <!---------------------- IMAGE & MAP --> | image = Mammoth_Spring_near_average.JPG | image_size = | image_caption = The Mammoth Spring outlet at normal flow stage. Pictured from the east looking westwardly. | map = | map_size = | map_caption = | pushpin_map = | pushpin_map_size = | pushpin_map_caption= <!---------------------- LOCATION --> | subdivision_type1 = Country | subdivision_name1 = [[United States]] | subdivision_type2 = State | subdivision_name2 = [[Arkansas]] | subdivision_type3 = Region | subdivision_name3 = [[Ozark Plateau]] | subdivision_type4 = | subdivision_name4 = | subdivision_type5 = City | subdivision_name5 = Mammoth Spring <!---------------------- PHYSICAL CHARACTERISTICS --> | length = | width_min = | width_avg = | width_max = | depth_min = | depth_avg = | depth_max = | discharge1_location= Mammoth Spring(harmonic mean flow)1981-2015<ref>{{cite web|url=http://waterdata.usgs.gov/nwis/annual?referred_module=sw&site_no=07069190&por_07069190_2=278782,00060,2,1981,2011&start_dt=1981&end_dt=2009&partial_periods=on&year_type=C&format=html_table&date_format=YYYY-MM-DD&rdb_compression=file&submitted_form=parameter_selection_list |title=USGS Surface Water data for USA: USGS Surface-Water Annual Statistics |publisher=Waterdata.usgs.gov |date= |accessdate=2012-11-27}}</ref> | discharge1_min = | discharge1_avg = {{convert|322|cuft/s|m3/s|abbr=on}}(harmonic mean flow)1981-2015<ref>{{cite web|url=http://waterdata.usgs.gov/nwis/annual?referred_module=sw&site_no=07069190&por_07069190_2=278782,00060,2,1981,2011&start_dt=1981&end_dt=2009&partial_periods=on&year_type=C&format=html_table&date_format=YYYY-MM-DD&rdb_compression=file&submitted_form=parameter_selection_list |title=USGS Surface Water data for USA: USGS Surface-Water Annual Statistics |publisher=Waterdata.usgs.gov |date= |accessdate=2012-11-27}}</ref> | discharge1_max = {{convert|694|cuft/s|m3/s|abbr=on}} <!---------------------- BASIN FEATURES --> | source1 = Spring River watershed | source1_location = [[Ozarks|Salem Plateau]], [[Ozark Plateau]], [[Missouri]] | source1_coordinates= | source1_elevation = | mouth = [[Spring River (Arkansas)|Spring River]] | mouth_location = [[Mammoth Spring, Arkansas|Mammoth Spring, AR]] | mouth_coordinates = {{coord|36|29|51|N|91|32|08|W|display=inline,title}}<ref>{{cite web|url=http://nwis.waterdata.usgs.gov/ar/nwis/peak?site_no=07069190&agency_cd=USGS&format=html |title=USGS Surface Water for Arkansas: Peak Streamflow |publisher=Nwis.waterdata.usgs.gov |date= |accessdate=2012-11-27}}</ref> | mouth_elevation = {{convert|490|ft|abbr=on}} | progression = | river_system = | basin_size = | tributaries_left = | tributaries_right = | custom_label = [[National Natural Landmark|U.S. NNL]] | custom_data = Designated 1972 | extra = }} '''Mammoth Spring''' is a large, [[Spring (hydrology)|first magnitude]] [[karst spring]] that arises in the [[Ozark Plateau]] within the state of [[Arkansas]]. It is the largest spring in Arkansas and the third-largest spring within the Ozark Plateau region behind [[Big Spring (Missouri)|Big Spring]] and [[Greer Spring (Missouri)|Greer Spring]]. Mammoth Spring is the seventh-largest natural spring in the world. The spring's outlet pool is contained entirely within [[Mammoth Spring State Park]]. The park is located in the town of [[Mammoth Spring, Arkansas|Mammoth Spring]], which lies in extreme north-central Arkansas. The outlet pool is adjacent to [[U.S. Route 63 in Arkansas|US Highway 63]], only 500 ft. south of the Missouri border, and it can be readily seen from the highway. The spring's large discharge volume rushes a few hundred feet down the outlet channel before merging with the [[Warm Fork Spring River|Warm Fork of the Spring River]] to form the [[Spring River (Arkansas)|Spring River]]. The cold water that emerges from the spring creates excellent trout fishing conditions and ample flow for water sports on the Spring River. Mammoth Spring was declared a [[National Natural Landmark]] by the [[United States Department of the Interior|Department of the Interior]] in June 1972.<ref name="nnl">{{cite web|url=http://www.nature.nps.gov/nnl/site.cfm?Site=MASP-AR|title=National Natural Landmark summary|date=February 5, 2004|publisher=National Park Service|accessdate=2009-05-10}}</ref>
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