Luke C. Loken Kimberly P. Wickland David J. Fazio Carolyn M. Soderstrom Matthew A. Pronschinske Sophia L. LaFond-Hudson Jacob A. Fleck Larry B. Barber Keith J. Doore James J. Duncker 20250314 tabular digital data Online (digital release) U.S. Geological Survey https://doi.org/10.5066/P9LSLXGJ In support of the U.S. Geological Survey (USGS)-Next Generation Water Observing System (NGWOS) program, water quality data were collected in 2022-2023 in the Illinois River Basin—the third USGS Integrated Water Science (IWS) basin. These data were collected to document spatial heterogeneity in water quality across seasons and hydrologic conditions and to improve predictions of carbon and nutrient dynamics in the Illinois Waterway. Surface water quality was measured using a boat-mounted, continuous sampling platform known as the Fast Limnological Automated Measurements (FLAMe; https://doi.org/10.1021/es504773x). Water was continually pumped onboard a moving boat to a series of water quality sensors configured to capture data every second. Measurements were georeferenced and spatially corrected using established routines and can be used to produce maps of water quality where the boat traveled. Overall, 807,876-point measurements were collected across the Illinois River Basin. Additionally, sensor-based measurements are associated with 175 discrete water samples analyzed for additional chemical and biological attributes (https://doi.org/10.5066/P13V2HX6, https://doi.org/10.5066/P13XBWO7). Ten onboard multiparameter instruments recording data from one or more sensors were used to collect up to 95 variables over the course of five sampling campaigns between May 2022 and July 2023. Onboard water quality sensors included a YSI EXO2 (temperature, specific conductivity, turbidity, pH, dissolved oxygen, fluorescent dissolved organic matter fluorescence, and total algal fluorescence), a Seabird SUNA V2 optical nitrate sensor (nitrate, absorbance), Turner C6P multi-fluorometer (turbidity, chromophoric dissolved organic matter, chlorophyll, optical brighteners, fluorescein, and refined fuels), a bbe fluoroprobe (green algae, blue green algae, diatoms, and cryptophytes), and a Los Gatos Research Ultraportable Greenhouse Gas Analyzer (dissolved carbon dioxide and methane). Additional instruments included two Garmin Global Poisitioning System (GPS) receivers (latitude, longitude, time), a Garmin depth sounder (water temperature and depth), and a Vaisala CS106 barometer (barometric pressure). All data were recorded continuously on a Campbell Scientific CR6 datalogger. System attributes (e.g., internal temperature, boat speed, wiper position, battery voltage) were also recorded to aid in data quality control. Each 6- to 10-day campaign (May 2022, Aug 2022, Nov 2022, Mar/Apr 2023, and Jul 2023) started in Chicago, IL, including sampling of Lake Michigan, and progressed down the Illinois Waterway, ultimately reaching the Mississippi River near Alton, IL. During each campaign, the boat primarily traveled downriver through the main navigation channel. The boat also traveled laterally into the mouths of several major tributaries and into select backwater areas. On the final two campaigns in 2023, we expanded the transect to include the North Branch Chicago River, the Calumet-Saganashkee Channel, and the confluence with the Missouri River. The crew attempted to sample the same features on each campaign; however, the exact sample path varied based on weather and hydrologic conditions. Some tributaries and off-channel areas were unnavigable during low water, and thus were not sampled. Actual sampling locations loosely followed pre-determined routes, but they were adjusted based on weather, field observations, and communication with local guides. These data were collected to evaluate spatial patterns in surface water quality in a highly managed waterway. These data will be used to evaluate spatial patterns in carbon, nutrients, algal dynamics, and waste water indices and to demonstrate longitudinal and lateral differences among river habitats. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20220502 20230719 See publication date Complete None planned World -90.67102 -87.49219 42.07511 38.79451 none specific conductivity chlorophyll blue green algae water depth ISO 19115 Topic Category farming USGS Thesaurus water temperature water pH turbidity carbon nitrogen algae oxygen content (water) surface water quality river systems freshwater ecosystems USGS Metadata Identifier USGS:63ed22fad34efa0476af4e0a none Illinois River Common geographic areas Chicago Illinois United States None. Please see 'Distribution Info' for details. These data are open access usable via creative commons as long as original data providers are acknowledged. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Center Director U.S. Geological Survey Center Director Mailing and Physical

One Gifford Pinchot Drive

Madison WI 53726 U.S.A. 608-828-9901 gs-w-umidwsc_center_director@usgs.gov U.S. Geological Survey, Water Mission Area - Water Quality Processes Program R version 4.3.3 (2024-02-29 ucrt) John T. Crawford Luke C. Loken Nora J. Casson Colin Smith Amanda G. Stone Luke A. Winslow 2015 publication https://doi.org/10.1021/es504773x Luke C. Loken John T. Crawford Paul J. Schramm Philipp Stadler Ankur R. Desai Emily H. Stanley 20190722 publication https://doi.org/10.1029/2019JG005186 E. J. Lee G. Y. Yoo Y. Jeong K. U. Kim J. H. Park N. H. Oh 20150528 publication https://doi.org/10.5194/bg-12-3109-2015 John F. Saraceno James B. Shanley Bryan D. Downing Brian A. Pellerin 20170123 publication https://doi.org/10.1002/lom3.10175 Water quality and gas sensors were calibrated according to manufacturer protocols. Post hoc corrections were applied to carbon dioxide and methane values after analsyis of gas standards. Not applicable Not applicable A formal accuracy assessment of the horizontal positional information in the dataset was not conducted. A formal accuracy assessment of the vertical positional information in the dataset was not conducted. Step 1: Sensors were calibrated according to manufacturer protocols. Water sensors were outfitted with manufacturer provided flow cells. Dissolved gases were equilibrated in a flow-through sprayer chamber following procedures outlined in Loken and others (2019). Water from 0.2 m depth was continuously pumped from the aft port side of the boat using a 5 GPM Shurflo Blaster II washdown pump. Water was routed through a size 50 mesh stainless steel screen and a series of Hayes automatic balancing valves to achieve a constant flow to the water quality sensors and gas equilibrator. 0.75 GPM of water was delivered to the seabird SUNA V2 optical nitrate sensor and then to the YSI EXO2. In Nov 2022, the Turner C6P multi-fluorometer was added to the end of the water flow sequence, and then in Mar 2023, the bbe fluoroprobe was added after the Turner C6P. The SUNA was kept in an ice bath to prevent overheating. 3.0 GPM of water was delivered to a homemade gas sprayer (Loken and others 2019), allowing dissolved gases to equilibrate in an enclosed headspace. Gases were recirculated to the Los Gatos Research Ultraportable Gas Analyzer (UGGA) using its internal pump at a flow rate of 0.8 standard pressure liters per minute (SPLM). Location was determined using a Garmin GPS 18X and a Garmin Echomap UHD. The Echomap transducer was mounted on the stern of the boat also capturing water temperature and depth to bottom. Barometric pressue was recorded with a Vaisala CS106 barometer. All data were captured continuously on a Campbell Scientific C6 datalogger and transmitted over wifi to an onboard computer for real-time visualization. 2025 Luke C Loken U.S. Geological Survey Research Hydrologist mailing and physical

1 Gifford Pinchot Drive

Madison WI 53726 US 608-821-3839 lloken@usgs.gov Step 2: Data from the datalogger were processed using several established routines (Loken and others 2019). First, “flame on” and “flame off” times were recorded to the second. Data outside these time intervals were excluded. Second, we applied post-calibration corrections for the SUNA and the UGGA. Prior to and after each campaign, we analyzed a set of nitrate, carbon dioxide, and methane standards to produce linear correction equations. The measured nitrate standard measurements were always within allowable ranges, and thus data from the SUNA were not adjusted. The UGGA tended to undermeasure the carbon dioxide and methane standards. We adjusted the reported carbon dioxide and methane data using using linear regression equations from the check standards measured after each campaign. Third, for each variable (e.g., temperature), we replaced data with NA that were outside variable specific boundaries. For example, water temperature was required to be between 0 and 100 degrees Celsius. Fourth, we used the R package SensorQC to identify spurious values, which were converted to NA in the data based on user-specified and variable-specific tolerances in rolling medians and rolling median absolute deviations. 2025 Step 3: For each variable, we established a set of hydraulic and sensor response times to spatially correct the data. Essentially, the hydraulic-corrected data have been moved backwards in time and location to account for the travel time of water and gas through the series of pipes, tubing, pumps, regulators, and flow cells. Second, we applied a differntial equation to account for sensor response dynamics, that adjusts the data for the amount of time for each flow cell to turnover and each sensor to stabilize. These methods are described in Crawford and others 2015 and Loken and others 2019. For each variable, we determined the specific hydraulic (hyd) and sensor response times (tau) using a series of step changes between known fluids in the laboratory. Columns ending in “_hyd" and “_tau” are the hydraulic- and tau-corrected (sensor response time) versions of each data variable. 2025 Step 4 (for Turner C6P sensors only): Turner C6P fluorometer measurements were corrected for water temperature and turbidity using site- and sensor-specific corrections. Measurements were first standardized to a common temperature (25 degrees Celsius) following equations in Lee and others 2015. Temperature-corrected values were then corrected for turbidity following equations listed in Saraceno and others 2017. Temperature and turbidity correction coefficients were determined in the laboratory using site-specific water. Briefly, water collected from the Illinois Waterway was measured across a range of temperatures and filtrations to develop regression equations for each variable. Columns amended with “_wt” and “_turb” represent the water temperature- and turbidity-corrected values, respectively. Chlorophyll and fluorescein were only temperature-corrected, while, chromophoric dissolved organic matter (CDOM), refined fuels, and optical brighteners were corrected for both temperature and turbidity. 2025 Jacob A Fleck U.S. Geological Survey, SOUTHWEST REGION Research Hydrologist mailing and physical

6000 J Street Placer Hall

Sacramento CA 95819 US 916-278-3063 916-278-3070 jafleck@usgs.gov Step 5: During each sampling campaign, ~30 discrete samples were collected for lab analyses. During these water collections, the boat stopped moving. The continuous, underway data were summarized to facilitate integration with lab-based measurements. Associated with each discrete sample time, we calculated the median of 60 seconds of continuous data. For example, if a sample time was recorded as 10:00, the median values between 10:00:00 and 10:00:59 were calculated and associated with the discrete sample collection. These data are reported in the "FLAMe_Samples.csv" data table, and can be joined to the lab-based discrete measurements using the "lab_id" column. 2025 U.S.A. Point Point 807876 1e-05 1e-05 Decimal degrees WGS84 WGS_1984 6378137.0 298.257 FLAMe_data.csv CSV file containing latitude, longitude, time, system diagnostics, and water quality metrics. U.S. Geological Survey id sample campaign Producer Defined NA NA NA DateTime_UTC date time in UTC (instrument: Garmin 18X) Producer Defined 2022-05-02 22:21:00 2023-07-19 19:59:00 YYYY-MM-DD HH:MM:SS latitude latitude (instrument: Garmin 18X) Producer Defined 38.79 42.08 decimal degrees longitude longitude (instrument: Garmin 18X) Producer Defined -90.67 -87.49 decimal degrees speed speed over ground (instrument: Garmin 18X) Producer Defined 0 33.1 knots course direction of boat travel (instrument: Garmin 18X) Producer Defined 0 359.9 decimal degrees extPower battery voltage (instrument: YSI EXO2) Producer Defined 10.56 13.67 volts wiperPos mechanical wiper position (instrument: YSI EXO2) Producer Defined 0.66 1.73 volts barom_mmHg barometric pressure (instrument: Vaisala CS106) Producer Defined 238.5 1030 millimeters mercury temp_int temperature of SUNA internal (instrument: Seabird SUNA V2) Producer Defined 5.2 35.2 degrees Celsius temp_spect temperature of SUNA spectrophotometer (instrument: Seabird SUNA V2) Producer Defined 4.4 34.7 degrees Celsius temp_lamp temperature of SUNA lamp (instrument: Seabird SUNA V2) Producer Defined 7.2 35.5 degrees Celsius temp_logger temperature of datalogger (instrument: Campbell CR6) Producer Defined 4.364 35.71 degrees Celsius depth water depth measured from transom-mounted sonar (instrument: Garmin Echomap) Producer Defined 0.26 15.61 meters temp_echo water temperature measured from transom-mounted sonar (instrument: Garmin Echomap) Producer Defined 5 29.73 degrees Celsius temp_exo water temperature (instrument: YSI EXO2) Producer Defined 4.726 31.26 degrees Celsius specCond specific conductivity (instrument: YSI EXO2) Producer Defined 170.3 1483 microsiems per centimeter pH pH (instrument: YSI EXO2) Producer Defined 6.86 9.36 unitless turb_FNU turbidity (instrument: YSI EXO2) Producer Defined 0 423.4 formazin nephelometric unit ODO_percent dissolved oxygen (instrument: YSI EXO2) Producer Defined 5.21 292.9 percent saturation ODO_mgL dissolved oxygen (instrument: YSI EXO2) Producer Defined 0.46 22 milligrams per liter chl_RFU_exo chlorophyll a fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -1.2 43.51 relative fluorescence unit chl_ugL_exo chlorophyll a fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -4.69 175.3 micrograms per liter bga_RFU_exo phyocyanin fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -0.9 8.44 relative fluorescence unit bga_ugL_exo phyocyanin fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -0.93 8.47 micrograms per liter fdom_RFU_exo fluorescent dissolved organic matter fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -0.05 49.34 relative fluorescence unit fdom_QSU_exo fluorescent dissolved organic matter fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -0.23 147.9 micrograms per liter quinine sulfate units pressure pressure inside EXO2 flow cell (instrument: YSI EXO2) Producer Defined 0 0 meters CH4_ppm methane (instrument: LGR UGGA) Producer Defined 2.05 8150 parts per million dry gas H2O_ppm water vapor (instrument: LGR UGGA) Producer Defined 501 45160 parts per million CO2_ppm carbon dioxide (instrument: LGR UGGA) Producer Defined 76.5 14640 parts per million dry gas NO3_uM nitrate (instrument: Seabird SUNA V2) Producer Defined 6.72 788.5 micromoles per liter NO3_mgL nitrate (instrument: Seabird SUNA V2) Producer Defined 0.094 11.04 milligrams nitrogen per liter abs254 absorbance at 254 nanometers (any negative values are associated with low values and/or sensor calibrations) (instrument: Seabird SUNA V2) Producer Defined -0.156 1.847 per meter abs350 absorbance at 350 nanometers (any negative values are associated with low values and/or sensor calibrations) (instrument: Seabird SUNA V2) Producer Defined -0.159 18 per meter temp_exo_hyd water temperature (instrument: YSI EXO2) Producer Defined 4.726 31.26 degrees Celsius temp_exo_tau water temperature (instrument: YSI EXO2) Producer Defined 3.657 31.28 degrees Celsius specCond_hyd specific conductivity (instrument: YSI EXO2) Producer Defined 170.3 1483 microsiems per centimeter specCond_tau specific conductivity (instrument: YSI EXO2) Producer Defined 170.1 1485 microsiems per centimeter pH_hyd pH (instrument: YSI EXO2) Producer Defined 6.86 9.36 unitless pH_tau pH (instrument: YSI EXO2) Producer Defined 6.85 10.09 unitless turb_FNU_hyd turbidity (instrument: YSI EXO2) Producer Defined 0 423.4 formazin nephelometric unit turb_FNU_tau turbidity (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -29.13 615.1 formazin nephelometric unit ODO_percent_hyd dissolved oxygen (instrument: YSI EXO2) Producer Defined 5.21 292.9 percent saturation ODO_percent_tau dissolved oxygen (instrument: YSI EXO2) Producer Defined 5.19 306.1 percent saturation ODO_mgL_hyd dissolved oxygen (instrument: YSI EXO2) Producer Defined 0.46 22 milligrams per liter ODO_mgL_tau dissolved oxygen (instrument: YSI EXO2) Producer Defined 0.44 22.99 milligrams per liter chl_RFU_exo_hyd chlorophyll a fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -1.2 43.51 relative fluorescence unit chl_RFU_exo_tau chlorophyll a fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -4.23 74.64 relative fluorescence unit chl_ugL_exo_hyd chlorophyll a fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -4.69 175.3 micrograms per liter chl_ugL_exo_tau chlorophyll a fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -16.86 301 micrograms per liter bga_RFU_exo_hyd phyocyanin fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -0.9 8.44 relative fluorescence unit bga_RFU_exo_tau phyocyanin fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -1.07 9.15 relative fluorescence unit bga_ugL_exo_hyd phyocyanin fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -0.93 8.47 micrograms per liter bga_ugL_exo_tau phyocyanin fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -1.1 8.96 micrograms per liter fdom_RFU_exo_hyd fluorescent dissolved organic matter fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -0.05 49.34 relative fluorescence unit fdom_RFU_exo_tau fluorescent dissolved organic matter fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -2.15 49.32 relative fluorescence unit fdom_QSU_exo_hyd fluorescent dissolved organic matter fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -0.23 147.9 micrograms per liter quinine sulfate units fdom_QSU_exo_tau fluorescent dissolved organic matter fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -6.13 147.9 micrograms per liter quinine sulfate units CH4_ppm_hyd methane (instrument: LGR UGGA) Producer Defined 2.05 8150 parts per million dry gas CH4_ppm_tau methane (instrument: LGR UGGA) Producer Defined 0.11 9978 parts per million dry gas CO2_ppm_hyd carbon dioxide (instrument: LGR UGGA) Producer Defined 76.5 10000 parts per million dry gas CO2_ppm_tau carbon dioxide (instrument: LGR UGGA) Producer Defined 1.1 10000 parts per million dry gas CH4_uM methane (instrument: LGR UGGA) Producer Defined 0.0036 11.89 micromoles per liter CH4_Sat methane (instrument: LGR UGGA) Producer Defined 107 426700 percent saturation CH4_uM_hyd methane (instrument: LGR UGGA) Producer Defined 0.0036 11.91 micromoles per liter CH4_Sat_hyd methane (instrument: LGR UGGA) Producer Defined 107 426700 percent saturation CH4_uM_tau methane (instrument: LGR UGGA) Producer Defined 0.0036 11.89 micromoles per liter CH4_Sat_tau methane (instrument: LGR UGGA) Producer Defined 2 3975000 percent saturation CO2_uM carbon dioxide (instrument: LGR UGGA) Producer Defined 2.25 720 micromoles per liter CO2_Sat carbon dioxide (instrument: LGR UGGA) Producer Defined 19.1 3660 percent saturation CO2_uM_hyd carbon dioxide (instrument: LGR UGGA) Producer Defined 2.26 720.4 micromoles per liter CO2_Sat_hyd carbon dioxide (instrument: LGR UGGA) Producer Defined 19.1 3660 percent saturation CO2_uM_tau carbon dioxide (instrument: LGR UGGA) Producer Defined 2.25 720 micromoles per liter CO2_Sat_tau carbon dioxide (instrument: LGR UGGA) Producer Defined 8.1 3692 percent saturation turb_C6P turbidity (instrument: Turner C6P) Producer Defined 0 428.5 Nephelometric Turbidity Units cdom_C6P chromophoric dissolved organic matter fluorescence (instrument: Turner C6P) Producer Defined 0 131.5 micrograms per liter quinine sulfate chl_C6P chlorophyll a fluorescence (instrument: Turner C6P) Producer Defined 0.24 101.3 parts per billion Brightners_C6P optical brightners fluorescence (instrument: Turner C6P) Producer Defined 0 2306 parts per billion OMRL ref std Fluorescein_C6P fluorescein fluorescence (instrument: Turner C6P) Producer Defined 0 154.9 parts per billion OMRL ref std Ref_Fuel_C6P refined fuel fluorescence (instrument: Turner C6P) Producer Defined 0 286.7 micrograms per liter NDSA pressure_C6P pressure inside C6P flow cell (instrument: Turner C6P) Producer Defined 0 1.276 pounds per square inch temp_C6P water temperature inside C6P flow cell (instrument: Turner C6P) Producer Defined 4.76 29.99 degrees Celsius cdom_C6P_wt chromophoric dissolved organic matter fluorescence water temperature corrected (instrument: Turner C6P) Producer Defined 0 125.8 micrograms per liter quinine sulfate cdom_C6P_turb chromophoric dissolved organic matter fluorescence water temperature and turbidity corrected (instrument: Turner C6P) Producer Defined 0 310.4 micrograms per liter quinine sulfate chl_C6P_wt chlorophyll a fluorescence water temperature corrected (instrument: Turner C6P) Producer Defined 0.23 101.6 parts per billion Brightners_C6P_wt optical brightners fluorescence water temperature corrected (instrument: Turner C6P) Producer Defined 0 2211 parts per billion OMRL ref std Brightners_C6P_turb optical brightners fluorescence water temperature and turbidity corrected (instrument: Turner C6P) Producer Defined 0 24160 parts per billion OMRL ref std Fluorescein_C6P_wt fluorescein fluorescence water temperature corrected (instrument: Turner C6P) Producer Defined 0 135.6 parts per billion OMRL ref std Ref_Fuel_C6P_wt refined fuel fluorescence water temperature corrected (instrument: Turner C6P) Producer Defined 0 276.5 micrograms per liter NDSA Ref_Fuel_C6P_turb refined fuel fluorescence water temperature and turbidity corrected (instrument: Turner C6P) Producer Defined 0 1480 micrograms per liter NDSA Trans_FP percent transmission (instrument: bbe Fluoroprobe) Producer Defined 0.41 106.2 percent GreenAlgae_FP green algae concentration (instrument: bbe Fluoroprobe) Producer Defined 0 132 micrograms per liter BlueGreen_FP blue green algae concentration (instrument: bbe Fluoroprobe) Producer Defined 0 51.28 micrograms per liter Diatoms_FP diatom concentration (instrument: bbe Fluoroprobe) Producer Defined 0 138.8 micrograms per liter Cryptophyta_FP cryptophyte concentration (instrument: bbe Fluoroprobe) Producer Defined 0 21.39 micrograms per liter YellowSubs_FP yellow substances concentration (instrument: bbe Fluoroprobe) Producer Defined 0 7.04 relative fluorescence unit FLAMe_samples.csv CSV file containing sample collection times, lab identification, latitude, longitude, system diagnostics, and water quality metrics associated with discrete samples. U.S. Geological Survey DateTime_UTC date time in UTC (instrument: Garmin 18X) Producer Defined 2022-05-03 13:45:00 2023-07-19 18:50:00 YYYY-MM-DD HH:MM:SS DateTime_local date time in local timezone Producer Defined 2022-05-03 08:45:00 2023-07-19 13:50:00 YYYY-MM-DD HH:MM:SS local_tz Timezone for loading in R Producer Defined NA NA NA lab_id Unique lab identifier Producer Defined NA NA NA USGS_station_id USGS station ID Producer Defined NA NA NA id sample campaign Producer Defined NA NA NA latitude latitude (instrument: Garmin 18X) Producer Defined 38.83 42.07 decimal degrees longitude longitude (instrument: Garmin 18X) Producer Defined -90.67 -87.51 decimal degrees speed speed over ground (instrument: Garmin 18X) Producer Defined 0 26.5 knots course direction of boat travel (instrument: Garmin 18X) Producer Defined 5.8 352 decimal degrees extPower battery voltage (instrument: YSI EXO2) Producer Defined 10.9 13.56 volts wiperPos mechanical wiper position (instrument: YSI EXO2) Producer Defined 1.17 1.19 volts barom_mmHg barometric pressure (instrument: Vaisala CS106) Producer Defined 732.7 759.9 millimeters mercury temp_int temperature of SUNA internal (instrument: Seabird SUNA V2) Producer Defined 5.4 35.2 degrees Celsius temp_spect temperature of SUNA spectrophotometer (instrument: Seabird SUNA V2) Producer Defined 4.6 34.6 degrees Celsius temp_lamp temperature of SUNA lamp (instrument: Seabird SUNA V2) Producer Defined 7.8 34.4 degrees Celsius temp_logger temperature of datalogger (instrument: Campbell CR6) Producer Defined 6.298 35.53 degrees Celsius depth water depth measured from transom-mounted sonar (instrument: Garmin Echomap) Producer Defined 0.75 13.81 meters temp_echo water temperature measured from transom-mounted sonar (instrument: Garmin Echomap) Producer Defined 5.64 27.09 degrees Celsius temp_exo water temperature (instrument: YSI EXO2) Producer Defined 4.728 30.13 degrees Celsius specCond specific conductivity (instrument: YSI EXO2) Producer Defined 256.9 1467 microsiems per centimeter pH pH (instrument: YSI EXO2) Producer Defined 6.88 9.21 unitless turb_FNU turbidity (instrument: YSI EXO2) Producer Defined 0.81 404.5 formazin nephelometric unit ODO_percent dissolved oxygen (instrument: YSI EXO2) Producer Defined 5.61 202 percent saturation ODO_mgL dissolved oxygen (instrument: YSI EXO2) Producer Defined 0.5 15.55 milligrams per liter chl_RFU_exo chlorophyll a fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -0.31 40.01 relative fluorescence unit chl_ugL_exo chlorophyll a fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -1.61 161.1 micrograms per liter bga_RFU_exo phyocyanin fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined 0.01 8.39 relative fluorescence unit bga_ugL_exo phyocyanin fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -0.02 8.42 micrograms per liter fdom_RFU_exo fluorescent dissolved organic matter fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined 0.2 47.03 relative fluorescence unit fdom_QSU_exo fluorescent dissolved organic matter fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined 0.4 141 micrograms per liter quinine sulfate units pressure pressure inside EXO2 flow cell (instrument: YSI EXO2) Producer Defined 0 0 meters CH4_ppm methane (instrument: LGR UGGA) Producer Defined 29.87 5582 parts per million dry gas H2O_ppm water vapor (instrument: LGR UGGA) Producer Defined 1926 42740 parts per million CO2_ppm carbon dioxide (instrument: LGR UGGA) Producer Defined 153.4 13870 parts per million dry gas NO3_uM nitrate (instrument: Seabird SUNA V2) Producer Defined 7 778.2 micromoles per liter NO3_mgL nitrate (instrument: Seabird SUNA V2) Producer Defined 0.098 10.9 milligrams nitrogen per liter abs254 absorbance at 254 nanometers (any negative values are associated with low values and/or sensor calibrations) (instrument: Seabird SUNA V2) Producer Defined -0.152 1.83 per meter abs350 absorbance at 350 nanometers (any negative values are associated with low values and/or sensor calibrations) (instrument: Seabird SUNA V2) Producer Defined -0.154 1.25 per meter temp_exo_hyd water temperature (instrument: YSI EXO2) Producer Defined 4.728 30.13 degrees Celsius temp_exo_tau water temperature (instrument: YSI EXO2) Producer Defined 4.728 30.13 degrees Celsius specCond_hyd specific conductivity (instrument: YSI EXO2) Producer Defined 256.6 1467 microsiems per centimeter specCond_tau specific conductivity (instrument: YSI EXO2) Producer Defined 256.4 1467 microsiems per centimeter pH_hyd pH (instrument: YSI EXO2) Producer Defined 6.88 9.21 unitless pH_tau pH (instrument: YSI EXO2) Producer Defined 6.88 9.21 unitless turb_FNU_hyd turbidity (instrument: YSI EXO2) Producer Defined 0.81 402 formazin nephelometric unit turb_FNU_tau turbidity (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined 0.81 400.4 formazin nephelometric unit ODO_percent_hyd dissolved oxygen (instrument: YSI EXO2) Producer Defined 5.61 205.1 percent saturation ODO_percent_tau dissolved oxygen (instrument: YSI EXO2) Producer Defined 5.61 207.7 percent saturation ODO_mgL_hyd dissolved oxygen (instrument: YSI EXO2) Producer Defined 0.5 15.76 milligrams per liter ODO_mgL_tau dissolved oxygen (instrument: YSI EXO2) Producer Defined 0.5 15.93 milligrams per liter chl_RFU_exo_hyd chlorophyll a fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -0.31 40.13 relative fluorescence unit chl_RFU_exo_tau chlorophyll a fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -0.31 40.12 relative fluorescence unit chl_ugL_exo_hyd chlorophyll a fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -1.61 161.7 micrograms per liter chl_ugL_exo_tau chlorophyll a fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -1.6 161.6 micrograms per liter bga_RFU_exo_hyd phyocyanin fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined 0.01 8.39 relative fluorescence unit bga_RFU_exo_tau phyocyanin fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined 0.01 8.39 relative fluorescence unit bga_ugL_exo_hyd phyocyanin fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -0.02 8.42 micrograms per liter bga_ugL_exo_tau phyocyanin fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined -0.02 8.41 micrograms per liter fdom_RFU_exo_hyd fluorescent dissolved organic matter fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined 0.11 47.03 relative fluorescence unit fdom_RFU_exo_tau fluorescent dissolved organic matter fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined 0.08 47.03 relative fluorescence unit fdom_QSU_exo_hyd fluorescent dissolved organic matter fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined 0.12 141 micrograms per liter quinine sulfate units fdom_QSU_exo_tau fluorescent dissolved organic matter fluorescence (any negative values are associated with low values and/or sensor calibrations) (instrument: YSI EXO2) Producer Defined 0.08 141 micrograms per liter quinine sulfate units CH4_ppm_hyd methane (instrument: LGR UGGA) Producer Defined 29.93 5581 parts per million dry gas CH4_ppm_tau methane (instrument: LGR UGGA) Producer Defined 19.35 5633 parts per million dry gas CO2_ppm_hyd carbon dioxide (instrument: LGR UGGA) Producer Defined 149.2 9412 parts per million dry gas CO2_ppm_tau carbon dioxide (instrument: LGR UGGA) Producer Defined 147.5 9367 parts per million dry gas CH4_uM methane (instrument: LGR UGGA) Producer Defined 0.0506 8.084 micromoles per liter CH4_Sat methane (instrument: LGR UGGA) Producer Defined 1564 292200 percent saturation CH4_uM_hyd methane (instrument: LGR UGGA) Producer Defined 0.0507 8.084 micromoles per liter CH4_Sat_hyd methane (instrument: LGR UGGA) Producer Defined 1567 292200 percent saturation CH4_uM_tau methane (instrument: LGR UGGA) Producer Defined 0.0506 8.084 micromoles per liter CH4_Sat_tau methane (instrument: LGR UGGA) Producer Defined 1011 294900 percent saturation CO2_uM carbon dioxide (instrument: LGR UGGA) Producer Defined 4.63 686.7 micromoles per liter CO2_Sat carbon dioxide (instrument: LGR UGGA) Producer Defined 38.3 3468 percent saturation CO2_uM_hyd carbon dioxide (instrument: LGR UGGA) Producer Defined 4.51 687.7 micromoles per liter CO2_Sat_hyd carbon dioxide (instrument: LGR UGGA) Producer Defined 37.3 3467 percent saturation CO2_uM_tau carbon dioxide (instrument: LGR UGGA) Producer Defined 4.63 686.7 micromoles per liter CO2_Sat_tau carbon dioxide (instrument: LGR UGGA) Producer Defined 36.8 3496 percent saturation turb_C6P turbidity (instrument: Turner C6P) Producer Defined 0.25 296.3 Nephelometric Turbidity Units cdom_C6P chromophoric dissolved organic matter fluorescence (instrument: Turner C6P) Producer Defined 1.76 127.4 micrograms per liter quinine sulfate chl_C6P chlorophyll a fluorescence (instrument: Turner C6P) Producer Defined 0.39 91.68 parts per billion Brightners_C6P optical brightners fluorescence (instrument: Turner C6P) Producer Defined 17.19 2243 parts per billion OMRL ref std Fluorescein_C6P fluorescein fluorescence (instrument: Turner C6P) Producer Defined 2 126.7 parts per billion OMRL ref std Ref_Fuel_C6P refined fuel fluorescence (instrument: Turner C6P) Producer Defined 8.76 257 micrograms per liter NDSA pressure_C6P pressure inside C6P flow cell (instrument: Turner C6P) Producer Defined 0 0.82 pounds per square inch temp_C6P water temperature inside C6P flow cell (instrument: Turner C6P) Producer Defined 4.76 27.93 degrees Celsius cdom_C6P_wt chromophoric dissolved organic matter fluorescence water temperature corrected (instrument: Turner C6P) Producer Defined 1.71 121.6 micrograms per liter quinine sulfate cdom_C6P_turb chromophoric dissolved organic matter fluorescence water temperature and turbidity corrected (instrument: Turner C6P) Producer Defined 1.66 120.3 micrograms per liter quinine sulfate chl_C6P_wt chlorophyll a fluorescence water temperature corrected (instrument: Turner C6P) Producer Defined 0.38 92.35 parts per billion Brightners_C6P_wt optical brightners fluorescence water temperature corrected (instrument: Turner C6P) Producer Defined 15.01 2102 parts per billion OMRL ref std Brightners_C6P_turb optical brightners fluorescence water temperature and turbidity corrected (instrument: Turner C6P) Producer Defined 18.15 2147 parts per billion OMRL ref std Fluorescein_C6P_wt fluorescein fluorescence water temperature corrected (instrument: Turner C6P) Producer Defined 1.9 110.9 parts per billion OMRL ref std Ref_Fuel_C6P_wt refined fuel fluorescence water temperature corrected (instrument: Turner C6P) Producer Defined 8.53 240.6 micrograms per liter NDSA Ref_Fuel_C6P_turb refined fuel fluorescence water temperature and turbidity corrected (instrument: Turner C6P) Producer Defined 9.71 304.3 micrograms per liter NDSA Trans_FP percent transmission (instrument: bbe Fluoroprobe) Producer Defined 0.51 106 percent GreenAlgae_FP green algae concentration (instrument: bbe Fluoroprobe) Producer Defined 0 98.17 micrograms per liter BlueGreen_FP blue green algae concentration (instrument: bbe Fluoroprobe) Producer Defined 0 50.19 micrograms per liter Diatoms_FP diatom concentration (instrument: bbe Fluoroprobe) Producer Defined 0.1016 133.8 micrograms per liter Cryptophyta_FP cryptophyte concentration (instrument: bbe Fluoroprobe) Producer Defined 0 11.24 micrograms per liter YellowSubs_FP yellow substances concentration (instrument: bbe Fluoroprobe) Producer Defined 0 6.946 relative fluorescence unit U.S. Geological Survey GS ScienceBase mailing address

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