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Person

Chad C Opatz

Hydrologic Technician

Washington Water Science Center

Email: copatz@usgs.gov
Office Phone: 253-552-1668
ORCID: 0000-0002-5272-0195

Location
934 Broadway
Suite 300
Tacoma , WA 98402
US

Supervisor: Wendy B Welch
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This data release contains motorboat-towed floating transient electromagnetic data collected from the Columbia River near Hanford WA. Data were collected using a ~16 foot (4.9 meters) outboard motorboat during two field campaigns: July 2021 and April 2022. In total, several hundred linear kilometers of data were collected from a reach of the Columbia that extends from approximately Vernita Bridge to Richland, WA with some additional data collected in the Horn area north of White Bluffs in April 2022. An Aarhus Geoinstruments FloaTEM system was used to collect these data. The depth of investigation of the FloaTEM system is variable but ranged from approximately 50 to 100 meters. Previously collected high-resolution...
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This data release provides information on the chemistry and character of bed sediments accumulated in the 1.6-mile long impoundment behind Enloe Dam on the Similkameen River in Okanogan County, WA. Sediment samples were collected during four weeks in October – December 2019. The sampling locations were distributed among 10 transects that ranged from 0.1-0.2 miles apart along the length of the reservoir. Surficial grab samples of bed material were collected at 27 locations representing the left, right or center of the channel cross-section where sampling was possible using a Ponar sampler. Sediment cores were collected with a Vibracore at 12 locations at or near the surficial grab sample transects, and discrete sediment...
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This data release contains four data sets that support ongoing U.S. Geological Survey investigations, in cooperation with the U.S. Navy, at the Bremerton Naval Complex (BNC), Sinclair Inlet, Washington. Child item #1 includes reported concentrations of mercury isotopes in 28 samples of new (2018-19) or archived (2008-09) particulate samples from the BNC, surface sediment from Sinclair Inlet, or surface sediment from representative bays in Puget Sound. Child item #2 includes the output data and geospatial locations of the cable deployment from the georeferenced fiber-optic distributed temperature sensing (FO-DTS) survey along the Operable Unit A unwalled shoreline. Child Item #3 includes the georeferenced near-bed...
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The U.S. Army Corps of Engineers scheduled repair on parts of an 850-ft long levee located along the Green River near S. 180th St. and Highway 181 downstream of Kent, WA. There is a Muckleshoot Indian Tribe Usual and Accustomed treaty area fishing site immediately downstream from the proposed bank work area and the Tribe is concerned that the levee rehabilitation project may cause changes to this fishing site. The U.S. Geological Survey (USGS) was contracted to measure and document river channel bathymetry at the Muckleshoot Indian Tribe fishing site in the immediate vicinity of the levee repair project. We made four site visits, one immediately before levee repair work on 7/30/2015, and three after the levee...
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Water temperature and the availability of cold-water refugia are important parameters during summer baseflows when stream water temperatures are at their maximum. The U.S. Geological Survey measured near-streambed and surface water temperatures along the lower Quinault River, on the Olympic Peninsula, Washington between August 9-12, 2016, during summer baseflow conditions. The survey occurred downstream from Lake Quinault from approximately River Kilometer (RK) 4 to approximately RK 49 (45 kilometers total). Near-streambed temperatures and water depths were measured at 1-second intervals, which occur on average at an approximately 1-meter water surface distance interval. Near-streambed temperature and depth were...
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