Two dissolved-oxygen experiments were completed using internally logging water-quality monitors. Dissolved-oxygen sensors on the water-quality monitors were calibrated using various settings and at various elevations in Oregon, USA. Data from these experiments can be used 1) to assess how elevation affects dissolved-oxygen values recorded by continuous water-quality monitors, and 2) to inform best practices for calibrating and recording dissolved oxygen at various elevations. Experiment #1 started by calibrating six YSI 6-series optical dissolved-oxygen sensors in Bend, Oregon, at an elevation of approximately 3,700 feet above sea level: 3 sensors were calibrated to 100% saturation, and 3 sensors were calibrated to 100% solubility (in mg/L) based on USGS DO Tables. During the experiment, sensors always remained in a 100% saturated environment. All calibrations and calibration checks were performed in a 100% air-saturated water environment (air-purged bucket of water). Sensors were kept in a water-saturated air environment (referred to as the wet-towel method) when in transport; the wet-towel method allowed the sensors to remain in a 100% saturated environment while the elevation and barometric pressure changed. Monitors were set to log internally at 15-minute intervals, and the monitors were transported over a pass in the Cascade Range and then to Salem, Oregon, which is at approximately 200 feet elevation. In Salem, sensor calibrations were checked, and then dissolved-oxygen sensors were calibrated again using the same settings as previously described. Monitors were transported back to Bend, Oregon, following the same route, where calibrations were checked. Experiment #2 started by calibrating six YSI optical dissolved-oxygen sensors in Bend, Oregon: 2 YSI 6-series sensors were calibrated to 100% saturation, 2 YSI 6-series sensors were calibrated to 100% solubility (in mg/L) based on USGS DO Tables, and 2 YSI EXO sensors were calibrated to 100% local saturation. Similar to experiment #1, sensors always remained in 100% saturated environments; calibration and calibration checks were performed in air-saturated water, and sensors were kept in a water-saturated air environment when in travel status. Monitors were transported over a pass in the Cascade Range and then to downtown Portland, Oregon, which is approximately 20 feet above sea level. Sensor calibrations were not checked or changed in Portland. Monitors were transported back to Bend, Oregon, following the same route, where calibrations were checked.

Dissolved oxygen measurements at Van Damme State Park: September 28, 2017 through , June 6, 2022. This data set contains water temperature and dissolved oxygen measurements, including percent saturation at 10 m depth from intervals of 60-seconds to ten minutes. This data and metadata were submitted by California Department of Fish and Wildlife (CDFW) Staff though the Data Management Plan (DMP) framework with the id: DMP000581. For more information, please visit https://wildlife.ca.gov/Data/Sci-Data.

Dissolved oxygen measurements at Van Damme State Park: September 28, 2017 through , June 6, 2022. This data set contains water temperature and dissolved oxygen measurements, including percent saturation at 10 m depth from intervals of 60-seconds to ten minutes. This data and metadata were submitted by California Department of Fish and Wildlife (CDFW) Staff though the Data Management Plan (DMP) framework with the id: DMP000581. For more information, please visit https://wildlife.ca.gov/Data/Sci-Data.

These data were compiled to better understand the controls on the magnitude of the metalimnion low dissolved oxygen zone in Lake Powell reservoir. These data represent dissolved oxygen, total suspended sediment, and nutrient data collected during laboratory water and sediment incubations. These data also represent summaries of summertime metalimnion dissolved oxygen concentrations at seven sites in Lake Powell, largely drawing from a pre-existing data release. These data were collected in Lake Powell reservoir, in the inflow regions where the Colorado River and the San Juan River enter Lake Powell, and from the Chinle Wash, which flows into the San Juan River before its confluence with Lake Powell by the U.S. Geological Survey and in collaboration with the Bureau of Reclamation and the National Park Service. These data can be used to quantify dissolved oxygen demand and nutrient transformations in the Lake Powell inflows. These data can also be used to evaluate patterns in summertime metalimnion dissolved oxygen, although we recommend users consult the original data release (Andrews and Deemer 2024) cited herein for this purpose given the more extensive nature of that dataset.

These data were compiled to better understand the controls on the magnitude of the metalimnion low dissolved oxygen zone in Lake Powell reservoir. These data represent dissolved oxygen, total suspended sediment, and nutrient data collected during laboratory water and sediment incubations. These data also represent summaries of summertime metalimnion dissolved oxygen concentrations at seven sites in Lake Powell, largely drawing from a pre-existing data release. These data were collected in Lake Powell reservoir, in the inflow regions where the Colorado River and the San Juan River enter Lake Powell, and from the Chinle Wash, which flows into the San Juan River before its confluence with Lake Powell by the U.S. Geological Survey and in collaboration with the Bureau of Reclamation and the National Park Service. These data can be used to quantify dissolved oxygen demand and nutrient transformations in the Lake Powell inflows. These data can also be used to evaluate patterns in summertime metalimnion dissolved oxygen, although we recommend users consult the original data release (Andrews and Deemer 2024) cited herein for this purpose given the more extensive nature of that dataset.

This dataset includes dissolved oxygen data collected at 5-min intervals over a 24-hour period at three agricultural streams: Maple Creek in NE (2004), Morgan Creek in Delaware (2004) and Stalker Creek in Idaho (2007).

This dataset includes dissolved oxygen data collected at 5-min intervals over a 24-hour period at three agricultural streams: Maple Creek in NE (2004), Morgan Creek in Delaware (2004) and Stalker Creek in Idaho (2007).

This data set, compiled by the USGS Lake Erie Biological Station, provides near-bottom measurements of temperature and dissolved oxygen for the Central Basin of Lake Erie. Data were recorded by self-contained environmental data loggers (PME, Inc., MiniDOT data loggers). The data loggers for 2023 were deployed to collect data during April 2023 through November 2023 to better understand how hypoxia develops and influences fish habitat quality during lake stratification. The data loggers were deployed on acoustic telemetry receivers in a network designed to record tagged fish movements (Great Lakes Acoustic Telemetry Observation System, GLATOS). Additional years of data collection are planned, and data release will be updated as necessary.

High frequency water-quality measurements were collected by the U.S. Geological Survey within Willow Creek Reservoir located in Heppner, Oregon. All measurements were taken at 0.5 meters below the surface with a YSI EXO2 multiparameter sonde. Information collected include location, time, water temperature, pH, specific conductance, dissolved oxygen, total chlorophyll, blue-green algae phycocyanin, and turbidity. The measurements were collected while boating around the reservoir at about 4 kilometers per hour.