Madison River near West Yellowstone, MT (YMAD), Yellowstone National Park Sample Collection: Samples were collected near the USGS stream gage 06037500 (Latitude 44°39'25.46", Longitude 111°04'04.67" NAD83). At the time of collection, all waters samples were filtered through a syringe filter (0.45-micrometer). Two splits of the filtered water were retained for chemical analyses, including an unacidified (FU) sample for determination of anion concentrations and a nitric acid preserved (FA; 1% volume-to-volume concentrated trace-metal grade nitric acid) sample for cation and trace metal analyses. During sample collection, the water temperature, specific conductance, and pH were often measured. Sample Analyses: Concentrations of chloride, fluoride, bromide, and sulfate were determined with an ion chromatograph (Dionex ICS-2000). Analytical errors for these constituents were typically less than 2%. Total alkalinity as bicarbonate was determined on stored samples, usually within several months after collection. Ten milliliters of sample were titrated with 0.05 Normal sulfuric acid to the bicarbonate end-point. The analytical error in alkalinity concentrations was roughly ± 5%. Concentrations of cations and trace metals were determined with an inductively coupled plasma-optical emission spectroscopy (Perkin Elmer Optima 7300 DV) following the methods described in Ball and others (2010). Database Contents The data file (YMAD.csv) contains the solute concentrations and the water discharge at the time of sampling for each of the rivers studied. The entries in the data file appear in the following columns: A. Date sample collected B. Time sample collected C. Water discharge (cubic feet per second) obtained from the U.S. Geological Survey's National Water Information System (NWIS) D. Water discharge (cubic meter per second) - obtained by multiplying column C by 0.02832 E. Chloride concentration (milligrams per liter) F. Fluoride concentration (milligrams per liter) G. Bromide concentration (milligrams per liter) H. Sulfate concentration (milligrams per liter) I. Alkalinity (milligrams per liter as bicarbonate) J. Chloride flux (grams/second) K. pH (standard units) L. Specific conductance (microSiemens per centimeter) M. Temperature (degrees Celsius) N. Calcium concentration (milligrams per liter) O. Magnesium concentration (milligrams per liter) P. Sodium concentration (milligrams per liter) Q. Potassium concentration (milligrams per liter) R. Iron concentration (milligrams per liter) S. Silica concentration (milligrams per liter) T. Boron concentration (milligrams per liter) U. Aluminum concentration (milligrams per liter) V. Lithium concentration (milligrams per liter) W. Strontium concentration (milligrams per liter) X. Barium concentration (milligrams per liter) Y. Rubidium concentration (milligrams per liter) Z. Manganese concentration (milligrams per liter) AA. Molybdenum concentration (milligrams per liter) AB. Copper concentration (milligrams per liter) AC. Zinc concentration (milligrams per liter) AD. Cadmium concentration (milligrams per liter) AE. Chromium concentration (milligrams per liter) AF. Cobalt concentration (milligrams per liter) AG. Lead concentration (milligrams per liter) AH. Nickel concentration (milligrams per liter) AI. Vanadium concentration (milligrams per liter) AJ. Arsenic concentration (milligrams per liter) AK. Antimony concentration (milligrams per liter) References Ball, J.W., McCleskey, R.B., and Nordstrom, D.K., 2010, Water-chemistry data for selected springs, geysers, and streams in Yellowstone National Park, Wyoming, 2006-2008: U.S. Geological Survey Open-File Report 2010-1192, 109 p.

Firehole River near Madison Junction (YFIR), Yellowstone National Park Sample Collection: Samples were collected near the USGS stream gage 06036905 (Latitude 44°37'12.66", Longitude 110°51'48.61" NAD83). At the time of collection, all waters samples were filtered through a syringe filter (0.45-micrometer). Two splits of the filtered water were retained for chemical analyses, including an unacidified (FU) sample for determination of anion concentrations and a nitric acid preserved (FA; 1% volume-to-volume concentrated trace-metal grade nitric acid) sample for cation and trace metal analyses. During sample collection, the water temperature, specific conductance, and pH were often measured. Sample Analyses: Concentrations of chloride, fluoride, bromide, and sulfate were determined with an ion chromatograph (Dionex ICS-2000). Analytical errors for these constituents were typically less than 2%. Total alkalinity as bicarbonate was determined on stored samples, usually within several months after collection. Ten milliliters of sample were titrated with 0.05 Normal sulfuric acid to the bicarbonate end-point. The analytical error in alkalinity concentrations was roughly ± 5%. Concentrations of cations and trace metals were determined with an inductively coupled plasma-optical emission spectroscopy (Perkin Elmer Optima 7300 DV) following the methods described in Ball and others (2010). Database Contents The data file (YFIR.csv) contains the solute concentrations and the water discharge at the time of sampling for each of the rivers studied. The entries in the data file appear in the following columns: A. Date sample collected B. Time sample collected C. Water discharge (cubic feet per second) obtained from the U.S. Geological Survey's National Water Information System (NWIS) D. Water discharge (cubic meter per second) - obtained by multiplying column C by 0.02832 E. Chloride concentration (milligrams per liter) F. Fluoride concentration (milligrams per liter) G. Bromide concentration (milligrams per liter) H. Sulfate concentration (milligrams per liter) I. Alkalinity (milligrams per liter as bicarbonate) J. Chloride flux (grams/second) K. pH (standard units) L. Specific conductance (microSiemens per centimeter) M. Temperature (degrees Celsius) N. Calcium concentration (milligrams per liter) O. Magnesium concentration (milligrams per liter) P. Sodium concentration (milligrams per liter) Q. Potassium concentration (milligrams per liter) R. Iron concentration (milligrams per liter) S. Silica concentration (milligrams per liter) T. Boron concentration (milligrams per liter) U. Aluminum concentration (milligrams per liter) V. Lithium concentration (milligrams per liter) W. Strontium concentration (milligrams per liter) X. Barium concentration (milligrams per liter) Y. Rubidium concentration (milligrams per liter) Z. Manganese concentration (milligrams per liter) AA. Molybdenum concentration (milligrams per liter) AB. Copper concentration (milligrams per liter) AC. Zinc concentration (milligrams per liter) AD. Cadmium concentration (milligrams per liter) AE. Chromium concentration (milligrams per liter) AF. Cobalt concentration (milligrams per liter) AG. Lead concentration (milligrams per liter) AH. Nickel concentration (milligrams per liter) AI. Vanadium concentration (milligrams per liter) AJ. Arsenic concentration (milligrams per liter) AK. Antimony concentration (milligrams per liter) References Ball, J.W., McCleskey, R.B., and Nordstrom, D.K., 2010, Water-chemistry data for selected springs, geysers, and streams in Yellowstone National Park, Wyoming, 2006-2008: U.S. Geological Survey Open-File Report 2010-1192, 109 p.

Firehole River near Madison Junction (YFIR), Yellowstone National Park Sample Collection: Samples were collected near the USGS stream gage 06036905 (Latitude 44°37'12.66", Longitude 110°51'48.61" NAD83). At the time of collection, all waters samples were filtered through a syringe filter (0.45-micrometer). Two splits of the filtered water were retained for chemical analyses, including an unacidified (FU) sample for determination of anion concentrations and a nitric acid preserved (FA; 1% volume-to-volume concentrated trace-metal grade nitric acid) sample for cation and trace metal analyses. During sample collection, the water temperature, specific conductance, and pH were often measured. Sample Analyses: Concentrations of chloride, fluoride, bromide, and sulfate were determined with an ion chromatograph (Dionex ICS-2000). Analytical errors for these constituents were typically less than 2%. Total alkalinity as bicarbonate was determined on stored samples, usually within several months after collection. Ten milliliters of sample were titrated with 0.05 Normal sulfuric acid to the bicarbonate end-point. The analytical error in alkalinity concentrations was roughly ± 5%. Concentrations of cations and trace metals were determined with an inductively coupled plasma-optical emission spectroscopy (Perkin Elmer Optima 7300 DV) following the methods described in Ball and others (2010). Database Contents The data file (YFIR.csv) contains the solute concentrations and the water discharge at the time of sampling for each of the rivers studied. The entries in the data file appear in the following columns: A. Date sample collected B. Time sample collected C. Water discharge (cubic feet per second) obtained from the U.S. Geological Survey's National Water Information System (NWIS) D. Water discharge (cubic meter per second) - obtained by multiplying column C by 0.02832 E. Chloride concentration (milligrams per liter) F. Fluoride concentration (milligrams per liter) G. Bromide concentration (milligrams per liter) H. Sulfate concentration (milligrams per liter) I. Alkalinity (milligrams per liter as bicarbonate) J. Chloride flux (grams/second) K. pH (standard units) L. Specific conductance (microSiemens per centimeter) M. Temperature (degrees Celsius) N. Calcium concentration (milligrams per liter) O. Magnesium concentration (milligrams per liter) P. Sodium concentration (milligrams per liter) Q. Potassium concentration (milligrams per liter) R. Iron concentration (milligrams per liter) S. Silica concentration (milligrams per liter) T. Boron concentration (milligrams per liter) U. Aluminum concentration (milligrams per liter) V. Lithium concentration (milligrams per liter) W. Strontium concentration (milligrams per liter) X. Barium concentration (milligrams per liter) Y. Rubidium concentration (milligrams per liter) Z. Manganese concentration (milligrams per liter) AA. Molybdenum concentration (milligrams per liter) AB. Copper concentration (milligrams per liter) AC. Zinc concentration (milligrams per liter) AD. Cadmium concentration (milligrams per liter) AE. Chromium concentration (milligrams per liter) AF. Cobalt concentration (milligrams per liter) AG. Lead concentration (milligrams per liter) AH. Nickel concentration (milligrams per liter) AI. Vanadium concentration (milligrams per liter) AJ. Arsenic concentration (milligrams per liter) AK. Antimony concentration (milligrams per liter) References Ball, J.W., McCleskey, R.B., and Nordstrom, D.K., 2010, Water-chemistry data for selected springs, geysers, and streams in Yellowstone National Park, Wyoming, 2006-2008: U.S. Geological Survey Open-File Report 2010-1192, 109 p.

Yellowstone River at Corwin Springs, MT (YYCR) Sample Collection: Samples were collected near the USGS stream gage 06191500 (Latitude 45°06'43.63", Longitude 110°47'37.20" NAD83). At the time of collection, all waters samples were filtered through a syringe filter (0.45-micrometer). Two splits of the filtered water were retained for chemical analyses, including an unacidified (FU) sample for determination of anion concentrations and a nitric acid preserved (FA; 1% volume-to-volume concentrated trace-metal grade nitric acid) sample for cation and trace metal analyses. During sample collection, the water temperature, specific conductance, and pH were often measured. Sample Analyses: Concentrations of chloride, fluoride, bromide, and sulfate were determined with an ion chromatograph (Dionex ICS-2000). Analytical errors for these constituents were typically less than 2%. Total alkalinity as bicarbonate was determined on stored samples, usually within several months after collection. Ten milliliters of sample were titrated with 0.05 Normal sulfuric acid to the bicarbonate end-point. The analytical error in alkalinity concentrations was roughly ± 5%. Concentrations of cations and trace metals were determined with an inductively coupled plasma-optical emission spectroscopy (Perkin Elmer Optima 7300 DV) following the methods described in Ball and others (2010). Database Contents The data file (YSNA.csv) contains the solute concentrations and the water discharge at the time of sampling for each of the rivers studied. The entries in the data file appear in the following columns: A. Date sample collected B. Time sample collected C. Water discharge (cubic feet per second) obtained from the U.S. Geological Survey's National Water Information System (NWIS) D. Water discharge (cubic meter per second) - obtained by multiplying column C by 0.02832 E. Chloride concentration (milligrams per liter) F. Fluoride concentration (milligrams per liter) G. Bromide concentration (milligrams per liter) H. Sulfate concentration (milligrams per liter) I. Alkalinity (milligrams per liter as bicarbonate) J. Chloride flux (grams/second) K. pH (standard units) L. Specific conductance (microSiemens per centimeter) M. Temperature (degrees Celsius) N. Calcium concentration (milligrams per liter) O. Magnesium concentration (milligrams per liter) P. Sodium concentration (milligrams per liter) Q. Potassium concentration (milligrams per liter) R. Iron concentration (milligrams per liter) S. Silica concentration (milligrams per liter) T. Boron concentration (milligrams per liter) U. Aluminum concentration (milligrams per liter) V. Lithium concentration (milligrams per liter) W. Strontium concentration (milligrams per liter) X. Barium concentration (milligrams per liter) Y. Rubidium concentration (milligrams per liter) Z. Manganese concentration (milligrams per liter) AA. Molybdenum concentration (milligrams per liter) AB. Copper concentration (milligrams per liter) AC. Zinc concentration (milligrams per liter) AD. Cadmium concentration (milligrams per liter) AE. Chromium concentration (milligrams per liter) AF. Cobalt concentration (milligrams per liter) AG. Lead concentration (milligrams per liter) AH. Nickel concentration (milligrams per liter) AI. Vanadium concentration (milligrams per liter) AJ. Arsenic concentration (milligrams per liter) AK. Antimony concentration (milligrams per liter) References Ball, J.W., McCleskey, R.B., and Nordstrom, D.K., 2010, Water-chemistry data for selected springs, geysers, and streams in Yellowstone National Park, Wyoming, 2006-2008: U.S. Geological Survey Open-File Report 2010-1192, 109 p.

Gardner River near Mammoth (YGAR), Yellowstone National Park Sample Collection: Samples were collected four kilometers downstream from the USGS stream gage 06191000 (Latitude 45°01'2.4", Longitude 110°41'37.2" NAD83). At the time of collection, all waters samples were filtered through a syringe filter (0.45-micrometer). Two splits of the filtered water were retained for chemical analyses, including an unacidified (FU) sample for determination of anion concentrations and a nitric acid preserved (FA; 1% volume-to-volume concentrated trace-metal grade nitric acid) sample for cation and trace metal analyses. During sample collection, the water temperature, specific conductance, and pH were often measured. Sample Analyses: Concentrations of chloride, fluoride, bromide, and sulfate were determined with an ion chromatograph (Dionex ICS-2000). Analytical errors for these constituents were typically less than 2%. Total alkalinity as bicarbonate was determined on stored samples, usually within several months after collection. Ten milliliters of sample were titrated with 0.05 Normal sulfuric acid to the bicarbonate end-point. The analytical error in alkalinity concentrations was roughly ± 5%. Concentrations of cations and trace metals were determined with an inductively coupled plasma-optical emission spectroscopy (Perkin Elmer Optima 7300 DV) following the methods described in Ball and others (2010). Database Contents The data file (YGAR.csv) contains the solute concentrations and the water discharge at the time of sampling for each of the rivers studied. The entries in the data file appear in the following columns: A. Date sample collected B. Time sample collected C. Water discharge (cubic feet per second) obtained from the U.S. Geological Survey's National Water Information System (NWIS) D. Water discharge (cubic meter per second) - obtained by multiplying column C by 0.02832 E. Chloride concentration (milligrams per liter) F. Fluoride concentration (milligrams per liter) G. Bromide concentration (milligrams per liter) H. Sulfate concentration (milligrams per liter) I. Alkalinity (milligrams per liter as bicarbonate) J. Chloride flux (grams/second) K. pH (standard units) L. Specific conductance (microSiemens per centimeter) M. Temperature (degrees Celsius) N. Calcium concentration (milligrams per liter) O. Magnesium concentration (milligrams per liter) P. Sodium concentration (milligrams per liter) Q. Potassium concentration (milligrams per liter) R. Iron concentration (milligrams per liter) S. Silica concentration (milligrams per liter) T. Boron concentration (milligrams per liter) U. Aluminum concentration (milligrams per liter) V. Lithium concentration (milligrams per liter) W. Strontium concentration (milligrams per liter) X. Barium concentration (milligrams per liter) Y. Rubidium concentration (milligrams per liter) Z. Manganese concentration (milligrams per liter) AA. Molybdenum concentration (milligrams per liter) AB. Copper concentration (milligrams per liter) AC. Zinc concentration (milligrams per liter) AD. Cadmium concentration (milligrams per liter) AE. Chromium concentration (milligrams per liter) AF. Cobalt concentration (milligrams per liter) AG. Lead concentration (milligrams per liter) AH. Nickel concentration (milligrams per liter) AI. Vanadium concentration (milligrams per liter) AJ. Arsenic concentration (milligrams per liter) AK. Antimony concentration (milligrams per liter) References Ball, J.W., McCleskey, R.B., and Nordstrom, D.K., 2010, Water-chemistry data for selected springs, geysers, and streams in Yellowstone National Park, Wyoming, 2006-2008: U.S. Geological Survey Open-File Report 2010-1192, 109 p.

Yellowstone National Park (YNP; Wyoming, Montana, and Idaho, USA) contains more than 10,000 hydrothermal features, several lakes, and four major watersheds. For more than 140 years, researchers at the U.S. Geological Survey and other scientific institutions have investigated the chemical compositions of hot springs, geysers, fumaroles, mud pots, streams, rivers, and lakes in YNP and surrounding areas. Water chemistry studies have revealed a range of compositions including waters with pH values ranging from about 1 to 10, surface temperatures from ambient to superheated values of 95°C, and elevated concentrations of silica, lithium, boron, fluoride, mercury, and arsenic. Hydrogeochemical data from YNP research have led to insights on subsurface conditions of temperature and chemistry, water-rock-gas interactions and processes of high-temperature mineral alteration with dissolution and precipitation, redox processes, thermophilic microbial metabolism under extreme conditions and effects of thermal water chemistry on river systems. In this Data Release, water chemistry data for 4,918 water samples are reported for numerous thermal features, rivers, streams, lakes, drillholes, and precipitation in and around YNP. The data for these samples were originally located in 38 reports published between 1888 and 2022 and in multiple unpublished documents. Spanning more than 600 unique sampling sites throughout the YNP region, this dataset includes samples collected as early as 1883 (Gooch & Whitfield, 1888) and as recently as 2021 (McCleskey, et al, 2022). The thermal features sampled most frequently include Cistern Spring (180 samples) and Echinus Geyser (73 samples) in Norris Geyser Basin and Ojo Caliente Spring (143 samples) in the Lower Geyser Basin, while more than 500 sites have 5 samples or fewer. Water chemistry data from thermal features, rivers, and streams are most represented, comprising 75% (thermal) and 17% (rivers/streams) of the dataset. Across all major areas of the park, Norris Geyser Basin has been sampled more than any other basin, with more than 1,100 samples reported in this dataset.

Yellowstone National Park (YNP; Wyoming, Montana, and Idaho, USA) contains more than 10,000 hydrothermal features, several lakes, and four major watersheds. For more than 140 years, researchers at the U.S. Geological Survey and other scientific institutions have investigated the chemical compositions of hot springs, geysers, fumaroles, mud pots, streams, rivers, and lakes in YNP and surrounding areas. Water chemistry studies have revealed a range of compositions including waters with pH values ranging from about 1 to 10, surface temperatures from ambient to superheated values of 95°C, and elevated concentrations of silica, lithium, boron, fluoride, mercury, and arsenic. Hydrogeochemical data from YNP research have led to insights on subsurface conditions of temperature and chemistry, water-rock-gas interactions and processes of high-temperature mineral alteration with dissolution and precipitation, redox processes, thermophilic microbial metabolism under extreme conditions and effects of thermal water chemistry on river systems. In this Data Release, water chemistry data for 4,918 water samples are reported for numerous thermal features, rivers, streams, lakes, drillholes, and precipitation in and around YNP. The data for these samples were originally located in 38 reports published between 1888 and 2022 and in multiple unpublished documents. Spanning more than 600 unique sampling sites throughout the YNP region, this dataset includes samples collected as early as 1883 (Gooch & Whitfield, 1888) and as recently as 2021 (McCleskey, et al, 2022). The thermal features sampled most frequently include Cistern Spring (180 samples) and Echinus Geyser (73 samples) in Norris Geyser Basin and Ojo Caliente Spring (143 samples) in the Lower Geyser Basin, while more than 500 sites have 5 samples or fewer. Water chemistry data from thermal features, rivers, and streams are most represented, comprising 75% (thermal) and 17% (rivers/streams) of the dataset. Across all major areas of the park, Norris Geyser Basin has been sampled more than any other basin, with more than 1,100 samples reported in this dataset.

Water analyses are reported for 66 samples collected from numerous thermal and non-thermal (rivers and streams) features in the southwestern areas of Yellowstone National Park (YNP) during 2009, 2017, and 2018. Water samples were collected from sources near Boundary Creek, Bechler River, Falls River, Mountain Ash Creek, Upper Snake River, Spirea Creek, and Lewis Lake. These water samples were collected and analyzed as part of research investigations on the chemistry of Yellowstone’s hydrothermal system and on the distribution of dissolved arsenic and mercury. Most samples were analyzed for major cations and anions, trace metals, redox species of arsenic, iron, nitrogen, and sulfur, and isotopes of hydrogen and oxygen. Radiogenic isotopes of strontium and tritium concentrations were also determined in selected samples. In addition, river and stream discharge data were obtained to determine the flux of chloride and other solutes from thermal areas in the southwest YNP.

Water analyses are reported for 66 samples collected from numerous thermal and non-thermal (rivers and streams) features in the southwestern areas of Yellowstone National Park (YNP) during 2009, 2017, and 2018. Water samples were collected from sources near Boundary Creek, Bechler River, Falls River, Mountain Ash Creek, Upper Snake River, Spirea Creek, and Lewis Lake. These water samples were collected and analyzed as part of research investigations on the chemistry of Yellowstone’s hydrothermal system and on the distribution of dissolved arsenic and mercury. Most samples were analyzed for major cations and anions, trace metals, redox species of arsenic, iron, nitrogen, and sulfur, and isotopes of hydrogen and oxygen. Radiogenic isotopes of strontium and tritium concentrations were also determined in selected samples. In addition, river and stream discharge data were obtained to determine the flux of chloride and other solutes from thermal areas in the southwest YNP.

Boiling River at Mammoth (YBOI), Yellowstone National Park Sample Collection: Samples were collected near the USGS stream gage 06190540 (Latitude 44°59'05.83", Longitude 110°41'18.20" NAD83). At the time of collection, all waters samples were filtered through a syringe filter (0.45-micrometer). Two splits of the filtered water were retained for chemical analyses, including an unacidified (FU) sample for determination of anion concentrations and a nitric acid preserved (FA; 1% volume-to-volume concentrated trace-metal grade nitric acid) sample for cation and trace metal analyses. During sample collection, the water temperature, specific conductance, and pH were often measured. Sample Analyses: Concentrations of chloride, fluoride, bromide, and sulfate were determined with an ion chromatograph (Dionex ICS-2000). Analytical errors for these constituents were typically less than 2%. Total alkalinity as bicarbonate was determined on stored samples, usually within several months after collection. Ten milliliters of sample were titrated with 0.05 Normal sulfuric acid to the bicarbonate end-point. The analytical error in alkalinity concentrations was roughly ± 5%. Concentrations of cations and trace metals were determined with an inductively coupled plasma-optical emission spectroscopy (Perkin Elmer Optima 7300 DV) following the methods described in Ball and others (2010). Database Contents The data file (YBOI.csv) contains the solute concentrations and the water discharge at the time of sampling for each of the rivers studied. The entries in the data file appear in the following columns: A. Date sample collected B. Time sample collected C. Water discharge (cubic feet per second) obtained from the U.S. Geological Survey's National Water Information System (NWIS) D. Water discharge (cubic meter per second) - obtained by multiplying column C by 0.02832 E. Chloride concentration (milligrams per liter) F. Fluoride concentration (milligrams per liter) G. Bromide concentration (milligrams per liter) H. Sulfate concentration (milligrams per liter) I. Alkalinity (milligrams per liter as bicarbonate) J. Chloride flux (grams/second) K. pH (standard units) L. Specific conductance (microSiemens per centimeter) M. Temperature (degrees Celsius) N. Calcium concentration (milligrams per liter) O. Magnesium concentration (milligrams per liter) P. Sodium concentration (milligrams per liter) Q. Potassium concentration (milligrams per liter) R. Iron concentration (milligrams per liter) S. Silica concentration (milligrams per liter) T. Boron concentration (milligrams per liter) U. Aluminum concentration (milligrams per liter) V. Lithium concentration (milligrams per liter) W. Strontium concentration (milligrams per liter) X. Barium concentration (milligrams per liter) Y. Rubidium concentration (milligrams per liter) Z. Manganese concentration (milligrams per liter) AA. Molybdenum concentration (milligrams per liter) AB. Copper concentration (milligrams per liter) AC. Zinc concentration (milligrams per liter) AD. Cadmium concentration (milligrams per liter) AE. Chromium concentration (milligrams per liter) AF. Cobalt concentration (milligrams per liter) AG. Lead concentration (milligrams per liter) AH. Nickel concentration (milligrams per liter) AI. Vanadium concentration (milligrams per liter) AJ. Arsenic concentration (milligrams per liter) AK. Antimony concentration (milligrams per liter) References Ball, J.W., McCleskey, R.B., and Nordstrom, D.K., 2010, Water-chemistry data for selected springs, geysers, and streams in Yellowstone National Park, Wyoming, 2006-2008: U.S. Geological Survey Open-File Report 2010-1192, 109 p.