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 data set, compiled by 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 were deployed during the stratified period (i.e., beginning of June 2020 through late October 2020) to better understand how hypoxia develops and influences fish habitat quality. 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.

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 were deployed to collect data during August 2021 through November 2022 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.

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 were deployed to collect data during mid-May 2021 through late October 2021 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.

We quantified the effects of dam sediment management operations on downstream salmonid spawning habitat during two fall water-level drawdown periods: an experimental drawdown leading to sediment release or a typical slower drawdown intended to minimize release of sediment. The experimental drawdown increased deposited fine sediment and decreased hyporheic dissolved oxygen levels. However, the typical drawdown did not increase fine sediment deposition or decrease hyporheic dissolved oxygen. We quantify the immediate impacts of dam operations using a number of water column and substrate metrics including total suspended sediment concentration, hyporheic dissolved oxygen concentration, and deposited sediment data from sediment infiltration bags.

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.

This release contains data collected to study the impacts of vegetation removal on the condition of Lake Ozette Sockeye spawning habitat. From October 2018 to May 2019, continuous sediment temperature and subsurface dissolved oxygen were collected at sites near Olsen's Beach on the eastern shore of Lake Ozette, WA. Data were collected from 3 sites; a spawning control (SC) where sockeye currently return to spawn; a vegetation control (VC) where nearshore vegetation inhibits the amount of sockeye spawning; and a vegetation treatment (TR) area where nearshore vegetation was manually removed to assess if habitat quality can be improved. In addition to the continuous data, particle size data from the nearshore were determined at the beginning (October 2018) and end (May 2019) of the study period. Details of data collection methods and data quality, are available in three child items (1) Estimates of groundwater flux from vertical temperature profiles within lakebed sediments at Lake Ozette, WA, October 2018 to April 2019, (2) Nearshore lake sediment particle-size distribution data, Lake Ozette, WA, October 2018 and May 2019, and (3) Subsurface dissolved oxygen and sediment temperature at Lake Ozette, WA, October 2018 to May 2019.

This release contains data collected to study the impacts of vegetation removal on the condition of Lake Ozette Sockeye spawning habitat. From October 2018 to May 2019, continuous sediment temperature and subsurface dissolved oxygen were collected at sites near Olsen's Beach on the eastern shore of Lake Ozette, WA. Data were collected from 3 sites; a spawning control (SC) where sockeye currently return to spawn; a vegetation control (VC) where nearshore vegetation inhibits the amount of sockeye spawning; and a vegetation treatment (TR) area where nearshore vegetation was manually removed to assess if habitat quality can be improved. In addition to the continuous data, particle size data from the nearshore were determined at the beginning (October 2018) and end (May 2019) of the study period. Details of data collection methods and data quality, are available in three child items (1) Estimates of groundwater flux from vertical temperature profiles within lakebed sediments at Lake Ozette, WA, October 2018 to April 2019, (2) Nearshore lake sediment particle-size distribution data, Lake Ozette, WA, October 2018 and May 2019, and (3) Subsurface dissolved oxygen and sediment temperature at Lake Ozette, WA, October 2018 to May 2019.

This dataset includes continuous dissolved oxygen and temperature data from the nearshore of Lake Ozette, WA. Data were collected using a HOBO (U26-001) dissolved oxygen/temperature sensor housed inside a self-contained PVC well screen installed to a depth of 15cm in the lakebed. Data was collected continuously from October 2018 to May 2019. This data was part of a project that studied the impact of removing nearshore vegetation on the quality of spawning habitat of native Lake Ozette sockeye. The study area consisted of 3 areas where dissolved oxygen and temperature were collected. A spawning control (SC) where sockeye currently return to spawn; a vegetation control (VC) where nearshore vegetation inhibits the amount of sockeye spawning; and a vegetation treatment (TR) area where nearshore vegetation was manually removed to assess if habitat quality can be improved.