Water-surface elevations were recorded by submerged pressure transducers in Spring, 2015 along the upper Willamette River, Oregon, between Eugene and Corvallis. The water-surface elevations were surveyed by using a real-time kinematic global positioning system (RTK-GPS) at each pressure sensor location. These water-surface elevations were logged over a small range of discharges, from 4,600 cubic feet per second to 10,800 cubic feet per second at Harrisburg, OR. These datasets were collected for equipment calibration and validation for the National Aeronautics and Space Administration’s (NASA) Surface Water and Ocean Topography (SWOT) satellite mission. This is one of multiple datasets that will be released for this effort.

Water-surface elevation measurements were collected in March 2015 along the upper Willamette River, Oregon, between Eugene to Corvallis. These surveys were collected over a small range of discharges using a real time kinematic global positioning system (RTK-GPS) on a motorboat traveling "on plane" along the river. These datasets were collected for equipment calibration and validation for the National Aeronautics and Space Administration’s (NASA) Surface Water and Ocean Topography (SWOT) satellite mission. This is one of multiple survey datasets that will be released for this effort.

Water-surface elevation measurements were collected in March 2015 along the upper Willamette River, Oregon, between Eugene to Corvallis. These surveys were collected over a small range of discharges using a real time kinematic global positioning system (RTK-GPS) on a motorboat traveling "on plane" along the river. These datasets were collected for equipment calibration and validation for the National Aeronautics and Space Administration’s (NASA) Surface Water and Ocean Topography (SWOT) satellite mission. This is one of multiple survey datasets that will be released for this effort.

Water-surface elevation measurements were collected in Spring, 2015 along the upper Willamette River, Oregon, between Harrisburg and Corvallis. These surveys were collected over a small range of discharges, from 6,900 cubic feet per second to 8,300 cubic feet per second, using a real-time kinematic global positioning system (RTK-GPS) on a motorboat at various cross sections along the river. These datasets were collected for equipment calibration and validation for the National Aeronautics and Space Administration’s (NASA) Surface Water and Ocean Topography (SWOT) satellite mission. This is one of multiple survey datasets that will be released for this effort.

Water-surface elevation measurements were collected in Spring, 2015 along the upper Willamette River, Oregon, between Harrisburg and Corvallis. These surveys were collected over a small range of discharges, from 6,900 cubic feet per second to 8,300 cubic feet per second, using a real-time kinematic global positioning system (RTK-GPS) on a motorboat at various cross sections along the river. These datasets were collected for equipment calibration and validation for the National Aeronautics and Space Administration’s (NASA) Surface Water and Ocean Topography (SWOT) satellite mission. This is one of multiple survey datasets that will be released for this effort.

Water surface elevations within seven Willamette River off-channel features (OCF; alcoves and side channels) were measured using submerged pressure transducers. Transducers were installed from late May through mid-October, 2016, when discharge of the Willamette River was between approximately 5,500 and 45,000 cubic feet per second at Salem, Oregon (USGS gage 14191000) and 3,500 to 17,500 cubic feet per second at Harrisburg, Oregon (USGS gage 14166000). Pressure transducer sensor depth was measured at all seven sites. For five of the sites, pressure transducer sensor depths were converted to water surface elevations by surveying the water surface at each transducer with a real-time kinematic global positioning system (RTK-GPS). Additionally, three barometric sensors were installed for barometric compensation of the water levels. These pressure transducer data sets were collected to characterize relationships between Willamette River discharges and water surface elevations in off-channel features. The USGS reserves the right to place these data into the USGS National Water Information System (NWIS) database at some point in the future, at which point the NWIS copy of the data would become the definitive copy.

Water-surface elevations were recorded by 12 submerged pressure transducers deployed from fall 2017 to summer 2018 along an approximately 25-km reach of the Siletz River, Oregon. All pressure transducers were deployed in the main channel of the Siletz River. The water-surface elevations were surveyed by using a real-time kinematic global positioning system (RTK-GPS) at each pressure sensor location. Data from 10 of the 12 loggers were used to calibrate hydraulic models for sections of the Siletz River.

Water-surface elevations were recorded by 12 submerged pressure transducers deployed from fall 2017 to summer 2018 along an approximately 25-km reach of the Siletz River, Oregon. All pressure transducers were deployed in the main channel of the Siletz River. The water-surface elevations were surveyed by using a real-time kinematic global positioning system (RTK-GPS) at each pressure sensor location. Data from 10 of the 12 loggers were used to calibrate hydraulic models for sections of the Siletz River.

The U.S. Geological Survey deployed eight submersible pressure transducers In the Arkansas River at Parkdale, Colorado on March 19, 2018. An additional transducer was left out of the water to correct for barometric pressure fluctuations. At the time of deployment and recovery, the coordinates of the top of the post to which the transducer was secured was surveyed with real-time kinematic Global Navigation Satellite System surveying equipment. Also at the time of deployment and recovery, the offset between the location on the transducer that records stage and the top of the post to which the transducer was secured was measured with an engineering ruler. The transducers collected a depth measurement every 1-min until the recovery of all eight transducers on March 22, 2018. The water-surface elevation was determined by averaging the offset and coordinates of the post collected at the time of deployment and recovery and adding the water depth collected by the transducer. The data included as part of this release include the horizontal location of the eight transducers and the average water-surface elevation during deployment. In addition, the date, time, barometric pressure compensated depth measurement, and computed water-surface elevation are reported for all eight transducers for the entire deployment.

The U.S. Geological Survey deployed eight submersible pressure transducers In the Arkansas River at Parkdale, Colorado on March 19, 2018. An additional transducer was left out of the water to correct for barometric pressure fluctuations. At the time of deployment and recovery, the coordinates of the top of the post to which the transducer was secured was surveyed with real-time kinematic Global Navigation Satellite System surveying equipment. Also at the time of deployment and recovery, the offset between the location on the transducer that records stage and the top of the post to which the transducer was secured was measured with an engineering ruler. The transducers collected a depth measurement every 1-min until the recovery of all eight transducers on March 22, 2018. The water-surface elevation was determined by averaging the offset and coordinates of the post collected at the time of deployment and recovery and adding the water depth collected by the transducer. The data included as part of this release include the horizontal location of the eight transducers and the average water-surface elevation during deployment. In addition, the date, time, barometric pressure compensated depth measurement, and computed water-surface elevation are reported for all eight transducers for the entire deployment.