This U.S. Geological Survey (USGS) Data Release provides spatial water-quality data collected from the Caloosahatchee River, St. Lucie River and Lake Okeechobee July 15-18 and August 19-22 of 2019, south Florida. Geo-referenced measurements of near surface water temperature, specific conductance, dissolved oxygen, pH, turbidity, chlorophyll fluorescence, phycocyanin fluorescence, and fluorescence of dissolved organic matter were recorded at 5 second intervals and nitrate+nitrite as nitrogen was recorded at 1 minute intervals during water-quality surveys in order to create high resolution water-quality maps of the study area. First posted April 9, 2020 Revised December 2020, ver.1.1

This data release contains phytoplankton classification and enumeration results from two moving boat surveys conducted on July 15 - 18, 2019 and August 19 - 22, 2019. These data were collected from the Caloosahatchee River and estuary, the St. Lucie River and estuary, and Lake Okeechobee with funding provided by the USGS Priority Ecosystems Greater Everglades Program.

This U.S. Geological Survey (USGS) Data Release provides spatial water-quality data collected from the Caloosahatchee River on June 21-22 and July 20, 2021, south Florida. Geo-referenced measurements of near surface water temperature, specific conductance, dissolved oxygen, pH, turbidity, chlorophyll fluorescence, phycocyanin fluorescence, and fluorescence of dissolved organic matter were recorded at 20 second intervals and nitrate+nitrite as nitrogen was recorded at 5 to 60 second intervals during water-quality surveys in order to create high resolution water-quality maps of the study area.

This U.S. Geological Survey (USGS) Data Release provides spatial water-quality data collected from Indian Creek in Johnson County, Kansas, on May 23, 2013, July 23, 2014, July 30, 2015, and August 26, 2015. Continuous water-quality monitors were used to measure water temperature, specific conductance, pH, turbidity, dissolved oxygen, chlorophyll, phycocyanin, nitrate, and fluorescent dissolved organic matter (fDOM) at 30-second intervals along a 13.3-kilometer reach of Indian Creek. This data release was produced in compliance with the federal open-data requirements as a way to make scientific products associated with USGS research efforts and publications available to the public. This dataset includes all continuously (30-second intervals) measured spatial data collected as part of a study to describe the spatiotemporal variability of nutrients in Indian Creek.

The dataset includes water-quality sensor readings collected by the U.S Geological Survey (USGS) from the Caloosahatchee River at the Franklin Lock and Dam and 12 open-air fiberglass tanks filled with Caloosahatchee River water used for mesocosm experiments testing the effects of elevated nutrients on harmful algal bloom (HAB) dynamics. This dataset contains water quality sensor readings from two of eight total independent experiments conducted from June 8-11, 2020 and September 14-17, 2020. Each of the 12 tanks were randomly treated with either ammonium hydroxide, sodium nitrate, sodium phosphate, or left untreated (controls) for a total of three replicates of each treatment. The tanks were treated with incrementally higher dosing solutions every 24 hours for the first three days of the four-day experiment (T0, T24, and T48). Biological and nutrient concentration samples were collected each day before and after the dosing solution was applied and at T72, the final day of the experiment. Water-quality sensor data were collected on all four days (T0, T24, T48, T72) at three depths within each tank and the river using a multi-parameter water-quality sonde before the dosing solutions were applied. Each point reading is provided as an instantaneous measurement. Water-quality parameters measured include chlorophyll fluorescence, dissolved oxygen, fluorescence of dissolved organic matter, pH, phycocyanin fluorescence, specific conductance, turbidity, and water temperature. The data is provided as a table in comma delimited format.

The dataset includes water-quality sensor readings collected by the U.S Geological Survey (USGS) from the Caloosahatchee River at the Franklin Lock and Dam and 12 open-air fiberglass tanks filled with Caloosahatchee River water used for mesocosm experiments testing the effects of elevated nutrients on harmful algal bloom (HAB) dynamics. This dataset contains water quality sensor readings from two of eight total independent experiments conducted from June 8-11, 2020 and September 14-17, 2020. Each of the 12 tanks were randomly treated with either ammonium hydroxide, sodium nitrate, sodium phosphate, or left untreated (controls) for a total of three replicates of each treatment. The tanks were treated with incrementally higher dosing solutions every 24 hours for the first three days of the four-day experiment (T0, T24, and T48). Biological and nutrient concentration samples were collected each day before and after the dosing solution was applied and at T72, the final day of the experiment. Water-quality sensor data were collected on all four days (T0, T24, T48, T72) at three depths within each tank and the river using a multi-parameter water-quality sonde before the dosing solutions were applied. Each point reading is provided as an instantaneous measurement. Water-quality parameters measured include chlorophyll fluorescence, dissolved oxygen, fluorescence of dissolved organic matter, pH, phycocyanin fluorescence, specific conductance, turbidity, and water temperature. The data is provided as a table in comma delimited format.

This U.S. Geological Survey (USGS) Data Release provides water-quality data collected from the Caloosahatchee River and 12 fiberglass tanks located within the Caloosahatchee River. The tanks were open to the atmosphere, and were closed to the river. Tanks were filled with native water within 1-2 hours prior to the first profile collected on May 6, July 8, and September 16. Nutrients were added at approximately 12:00 p.m. on May 6, 11:45 a.m. on July 8, and 11:00 a.m. on September 16. Sodium nitrate was added for the nitrate treatments, sodium phosphate was added for the phosphate treatments, and ammonium hydroxide was added for the ammonium treatments. Nutrient samples were collected and processed by Nova Southeastern University. Water-quality measurements were made at 3 depths within each fiberglass tank, near the surface (approximately 1 foot deep), near the middle of the water column, (approximately 2 feet deep) and near the bottom (approximately 3 feet deep), and at approximately 1, 2, and 3 feet deep within the river itself. Each depth location value represents an approximate 30 second average. Water-quality characteristics measured and recorded include water temperature, specific conductance, dissolved oxygen, pH, turbidity, chlorophyll fluorescence, phycocyanin fluorescence, and fluorescence of dissolved organic matter.

This U.S. Geological Survey (USGS) Data Release provides water-quality data collected from the Caloosahatchee River and 12 fiberglass tanks located within the Caloosahatchee River. The tanks were open to the atmosphere, and were closed to the river. Tanks were filled with native water within 1-2 hours prior to the first profile collected on May 6, July 8, and September 16. Nutrients were added at approximately 12:00 p.m. on May 6, 11:45 a.m. on July 8, and 11:00 a.m. on September 16. Sodium nitrate was added for the nitrate treatments, sodium phosphate was added for the phosphate treatments, and ammonium hydroxide was added for the ammonium treatments. Nutrient samples were collected and processed by Nova Southeastern University. Water-quality measurements were made at 3 depths within each fiberglass tank, near the surface (approximately 1 foot deep), near the middle of the water column, (approximately 2 feet deep) and near the bottom (approximately 3 feet deep), and at approximately 1, 2, and 3 feet deep within the river itself. Each depth location value represents an approximate 30 second average. Water-quality characteristics measured and recorded include water temperature, specific conductance, dissolved oxygen, pH, turbidity, chlorophyll fluorescence, phycocyanin fluorescence, and fluorescence of dissolved organic matter.

This U.S. Geological Survey (USGS) Data Release provides water-quality data collected from the Caloosahatchee River and 12 fiberglass tanks located within the Caloosahatchee River. The tanks were open to the atmosphere, and were closed to the river. Tanks were filled with native water within 1-2 hours prior to the first profile collected on May 6, July 8, and September 16. Nutrients were added at approximately 12:00 p.m. on May 6, 11:45 a.m. on July 8, and 11:00 a.m. on September 16. Sodium nitrate was added for the nitrate treatments, sodium phosphate was added for the phosphate treatments, and ammonium hydroxide was added for the ammonium treatments. Nutrient samples were collected and processed by Nova Southeastern University. Water-quality measurements were made at 3 depths within each fiberglass tank, near the surface (approximately 1 foot deep), near the middle of the water column, (approximately 2 feet deep) and near the bottom (approximately 3 feet deep), and at approximately 1, 2, and 3 feet deep within the river itself. Each depth location value represents an approximate 30 second average. Water-quality characteristics measured and recorded include water temperature, specific conductance, dissolved oxygen, pH, turbidity, chlorophyll fluorescence, phycocyanin fluorescence, and fluorescence of dissolved organic matter.

This U.S. Geological Survey (USGS) Data Release provides continuously-measured water-quality data collected from two sites on Milford Lake, Kansas, during May 25-26, June 8-10, July 20-21, and September 14-15, 2016. All data are reported as raw measured values and are not rounded to USGS significant figures. Water-quality monitors were used to measure water temperature, specific conductance, turbidity, pH, chlorophyll, phycocyanin, dissolved oxygen, and fluorescent dissolved organic matter (fDOM) at fifteen-minute intervals. This dataset includes all continuously measured data collected at two short-term, fixed-site locations as part of a study to evaluate the spatial variability of harmful algal blooms in Milford Lake, Kansas.