Particle-size data collected of the upper 25 cm of substrate was collected at 12 sites in October 2018 and May 2019 at Olsen's Beach in Lake Ozette, Clallam County, Washington. At emergent stations, the top 25 cm of substrate was collected using a shovel and was transferred into a bucket. Bulk sediment samples were collected at submergent stations using a McNeil sampler inserted into the lakebed (McNeil and Ahnell, 1964) from which sediment was extracted by hand to a depth of 25 cm below the lakebed and residual water containing suspended sediment was sampled. Particle size distribution of sediment larger than 8 mm was sieved and weighed in the field and sediment less than 8 mm was sent to the USGS Cascades Volcano Observatory (CVO) sediment laboratory for particle-size distribution analysis. The volume of residual water within the McNeil sampler was measured and its suspended sediment concentration was analyzed at USGS CVO.

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.

This dataset includes all files used to model groundwater-surface water exchange in the nearshore of Lake Ozette, WA, located within Olympic National Park. Sediment temperature data was collected continuously from October 2018 to April 2019 at multiple depths using temperature rods that were installed in the lakebed in a portion of the nearshore on the eastern shoreline of Lake Ozette. Temperature data was collected at depths of 1, 4, 7, 11, and 50 cm, depending on the length of the temperature rod, using internally logging iButton temperature sensors (model DS1922L). 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 estimates of groundwater-surface water exchange were made. 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. Specific discharge across the sediment-water interface was estimated using the 1DTempPro V2 model; a USGS graphical user interface that solves a 1-dimensional heat flux equation (VS2DH). The 1DTempPro V2 model is available at https://code.usgs.gov/water/espd/hgb/1dtemppro. The 1DTempPro V2 model was run at 8 different sites within the study area at steady state using 1-week subsets of the data throughout the deployment period. All available depths were used from each temperature rod for the modeling of specific discharge. Note: a negative specific discharge indicates upward flow (groundwater discharge) into the lake. This data release contains the formatted sediment temperature time series data for each site (input.zip), the files needed to run the model (source.zip), and a summary of the specific discharge results at each site (output.zip). Additional details are provided in the readme.txt file.

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.

Bathymetry data were collected during a July 2019 SWATHPlus survey of Ozette Lake, Washington. Data were collected and processed by the the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) with fieldwork activity number 2019-622-FA. The 2-m bathymetry data are provided as a GeoTIFF image.

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.

The sampling of three hydrologically diverse Minnesota Lakes (Williams Lake, Shingobee Lake, and Lake Manganika) took place during the years of 2012 to 2013. Water samples were collected and filtered in the field using 0.45 micrometer capsule filters (Versapor membrane), silicon tubing, and a peristaltic pump. Water samples were then shipped on ice to the U.S. Geological Survey in Boulder, Colorado and chilled to approximately 4 degrees Celsius until analysis. Dissolved organic matter (DOM) was separated into fractions by an isolation method that passes aqueous sample through Amberlite XAD8 and XAD4 resins using low pressure liquid chromatography. The hydrophobic organic acid (HPOA) fraction is the eluate from the XAD8 fractionation column and the transphilic organic acid (TPIA) fraction is the eluate from the XAD4 fractionation column. Dissolved organic carbon (DOC) was measured on an OI700 Analytical total organic carbon analyzer by wet-oxidation; each sample was measured in replicate and the average was reported. Ultraviolet (UV) absorbance at the wavelength of 254 nm was measured with an Agilent HP8453 UV-Vis spectrophotometer. Specific UV Absorbance (SUVA) at 254 nm is a calculated parameter defined as the UV absorbance at a wavelength of 254 nm in absorbance units per centimeter divided by the DOC concentration in milligrams per liter and then multiplied by 100. SUVA 254 nm is reported in units of liters per milligram carbon per meter and correlates with the percent aromatic carbon of the DOM. Iron(III) absorbs UV light at 254 nm and, if present at appreciable concentration, can influence UV absorbance and calculated SUVA values. Utilizing a Hach spectrophotometer, total iron concentration was measured. The total iron concentrations of filtered whole water samples from each Minnesota Lake site were determined, and were not high enough to significantly influence SUVA 254 nm values. Associated laboratory quality assurance and quality control measures have been taken to produce final data.

Seismic-reflection data and cores were collected in Ozette Lake, Washington, from 2019 to 2021. These data were used to investigate submarine landslide deposits triggered by large Cascadia Subduction Zone earthquakes.