Temperature loggers were placed on the ground (n=4) and hung in the air (n=2) near the upstream connection point of four Willamette River off-channel features (side channels and alcoves) to assess timing and discharge conditions when these four off-channel features were inundated at the upstream end with flow from the main channel. Temperature readings indicate that the upstream end of an off-channel feature is inundated when the ground temperature sensor does not match nearby air temperature readings, indicating the ground sensor is submerged by river water. Temperature loggers were installed from late May through mid-November, 2016, when discharge of the Willamette River was between approximately 5,500 and 45,000 cubic feet per second at Salem, Oregon (3,500 to 17,500 cubic feet per second at Harrisburg, Oregon). The timing and persistence of surface water connections between off-channel features and the main channel are key variables in understanding changes in temperature and water quality conditions within off-channel features.

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 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 quality point measurements were collected by the U.S. Geological Survey within the main channel Willamette River and its off-channel features in the summer and autumn of 2015 and 2016. All measurements include location, time, temperature, and depth below water surface, while most also include specific conductivity, dissolved oxygen, and pH.

Water quality point measurements were collected by the U.S. Geological Survey within the main channel Willamette River and its off-channel features in the summer and autumn of 2015 and 2016. All measurements include location, time, temperature, and depth below water surface, while most also include specific conductivity, dissolved oxygen, and pH.

The data were collected summer, 2016, 2017, and 2018. Continuous temperature loggers were deployed along the Pend Oreille River between Albeni Falls Dam and the Box Canyon Dam. Loggers were checked every 1-2 weeks throughout the summer.

The data were collected summer, 2016, 2017, and 2018. Continuous temperature loggers were deployed along the Pend Oreille River between Albeni Falls Dam and the Box Canyon Dam. Loggers were checked every 1-2 weeks throughout the summer.

Water quality point measurements were collected by the U.S. Geological Survey along the lower Willamette River near the cities of Lake Oswego and Wilsonville, Oregon, as well as the lowest two kilometers of the Clackamas River, Molalla River, and Johnson Creek. These measurements were collected in the main channel and off-channel features on discreet dates from April through October of 2017. All measurements include location, time, temperature, and depth below water surface, while many also include specific conductance, dissolved oxygen, pH, and turbidity.

Water quality point measurements were collected by the U.S. Geological Survey along the lower Willamette River near the cities of Lake Oswego and Wilsonville, Oregon, as well as the lowest two kilometers of the Clackamas River, Molalla River, and Johnson Creek. These measurements were collected in the main channel and off-channel features on discreet dates from April through October of 2017. All measurements include location, time, temperature, and depth below water surface, while many also include specific conductance, dissolved oxygen, pH, and turbidity.

This dataset includes georeferenced, high-resolution, airborne thermal infrared (TIR) and high-resolution true-color imagery, a polyline shapefile of the channel centerline, a polyline shapefile with TIR sample points for longitudinal stream temperature profiles, and a tabular file with longitudinal stream temperature profiles for the Donner und Blitzen River and its tributaries, Oregon. The aerial TIR surveys were conducted with a helicopter by NV5 Geospatial and are published as 17 raster mosaics in GeoTiff format with a resolution of 0.3 meters (m). The TIR mosaics contain corrected surface temperatures in degrees Celsius (C) (multiplied by 10 to create an unsigned integer pixel type). The longitudinal stream temperature profiles have temperatures in degrees C. The TIR dataset encompasses 159 kilometers (km) of the Donner und Blitzen River and its tributaries that extends from near Frenchglen, Oregon into the basin headwaters on Steens Mountain. The TIR surveys were collected during the afternoons (13:00-17:00) of August 13, 14, and 15, 2020. The TIR surveys were calibrated using continuous temperature loggers deployed at 29 in-stream locations distributed longitudinally throughout the survey area. The true-color imagery is published as a single raster mosaic of the entire surveyed upper Donner und Blitzen River basin stream network with a resolution of 0.1 m. Channel centerlines were manually digitized within a geographic information system. Stream temperatures for longitudinal profiles were sampled using both automated and manual methods along the channel centerline from the TIR imagery. The stream temperatures were plotted versus channel distances upstream along the Donner und Blitzen River, starting from the bridge over the river near Page Springs Campground to create longitudinal stream temperature profiles, which may be used to interpret groundwater discharge patterns and to identify potential cold-water refuges.