An upward-looking acoustic Doppler velocity meter (ADVM, SonTek SW, 3.0 MHz) located in a tidal channel of the Nisqually River Delta at site D2 (N 47d 05’ 37.2”/W 122d 42’ 56.4”) measured water level and current velocity at 15-minute intervals from February 16 to July 20, 2017 (104 of 154 days, accounting for missing periods). This site is in a tidal channel at a levee breach where flow is tidally influenced. The water depth of the sensor ranged from 0.04 to 4.63 m and may have been lower during periods of extreme low tide. The elevation (NAVD88) of the ADVM sensor was surveyed by RTN-GPS. The offset to convert all water depth time-series data to water surface elevation (NAVD88) is 0.06 meters. Instrument temperature ranged from 4.6 to 24.2 degrees C but may be bias during periods of low tide due to solar heating of the instrument. The mean downstream velocity component (Vx) ranged from -0.96 to 0.77 m/s. The mean vertical velocity component (Vy) ranged from -0.25 to 0.27 m/s and signal to noise ratio ranged from 13.2 to 74.2 dB. The ADVM measured the water-velocity profile using a dynamic boundary adjustment mode allowing up to 10 velocity measurements in the water-column profile. Time-series gaps of 15-minutes or more occurred when the instrument was offline, when error thresholds were exceeded, or when the water level in the channel dropped below the elevation of the sensor during periods of extreme low tide. This site is also referenced as "USGS 12081520 Madrone Channel near Olympia, WA". Discrete discharge data at this site are available at: https://waterdata.usgs.gov/wa/nwis/inventory/?site_no=12081520&agency_cd=USGS&

An upward-looking acoustic Doppler velocity meter (ADVM, SonTek SW, 3.0 MHz) located in a tidal channel of the Nisqually River Delta at site D1 (N 47d 05’ 37”/W 122d 43’ 17”) measured water level and current velocity at 15-minute intervals from October 14, 2016 to May 31, 2017 (175 days, excluding missing periods). This site is in a tidal channel at a levee breach where flow is tidally influenced. The water depth of the sensor ranged from 0.44 to 4.41 m. The elevation (NAVD88) of the ADVM sensor was survey by RTN-GPS. The offset to convert all water depth time-series data to water surface elevation (NAVD88) is -0.61 m. The water temperature ranged from -0.4 to 22.7 degrees C but may have been bias during periods of low tide due to solar heating of the instrument. Water level in the channel dropped below the elevation of the sensor during periods of low tide. The mean downstream velocity component (Vx) ranged from -0.93 to 0.77 m/s. The mean vertical velocity component (Vy) ranged from -0.14 to 0.14 m/s and mean signal to noise ratio ranged from 12.5 to 45.8 dB. The ADVM measured the water-velocity profile using a dynamic boundary adjustment mode allowing up to 10 velocity measurements in the water-column profile. Time-series gaps of 15-minutes or more are reported as “NA” and occurred when the instrument was offline, when error thresholds were exceeded, or when the water level in the channel dropped below the elevation of the sensor during periods of extreme low tide. Missing periods caused by power failure occurred from November 18-28, 2016; January 6-22, 2017; February 5-17, 2017; and April 1-11, 2017. This site is also referenced as "USGS 12081515 Area One near Olympia, WA". Discrete discharge data at this site are available at: https://waterdata.usgs.gov/wa/nwis/inventory/?site_no=12081515&agency_cd=USGS&

An upward-looking acoustic Doppler velocity meter (ADVM, SonTek SW, 3.0 MHz) located in a tidal channel of the Nisqually River Delta at site D1 (N 47d 05’ 37”/W 122d 43’ 17”) measured water level and current velocity at 15-minute intervals from October 14, 2016 to May 31, 2017 (175 days, excluding missing periods). This site is in a tidal channel at a levee breach where flow is tidally influenced. The water depth of the sensor ranged from 0.44 to 4.41 m. The elevation (NAVD88) of the ADVM sensor was survey by RTN-GPS. The offset to convert all water depth time-series data to water surface elevation (NAVD88) is -0.61 m. The water temperature ranged from -0.4 to 22.7 degrees C but may have been bias during periods of low tide due to solar heating of the instrument. Water level in the channel dropped below the elevation of the sensor during periods of low tide. The mean downstream velocity component (Vx) ranged from -0.93 to 0.77 m/s. The mean vertical velocity component (Vy) ranged from -0.14 to 0.14 m/s and mean signal to noise ratio ranged from 12.5 to 45.8 dB. The ADVM measured the water-velocity profile using a dynamic boundary adjustment mode allowing up to 10 velocity measurements in the water-column profile. Time-series gaps of 15-minutes or more are reported as “NA” and occurred when the instrument was offline, when error thresholds were exceeded, or when the water level in the channel dropped below the elevation of the sensor during periods of extreme low tide. Missing periods caused by power failure occurred from November 18-28, 2016; January 6-22, 2017; February 5-17, 2017; and April 1-11, 2017. This site is also referenced as "USGS 12081515 Area One near Olympia, WA". Discrete discharge data at this site are available at: https://waterdata.usgs.gov/wa/nwis/inventory/?site_no=12081515&agency_cd=USGS&

An upward-looking acoustic Doppler velocity meter (ADVM, SonTek SW, 3.0 MHz) located in a tidal channel of the Nisqually River Delta at site D4 (N 47d 05’ 37”/W 122d 42’ 18.7”) measured water level and current velocity at 15-minute intervals from October 13, 2016 to May 3, 2017 (158 out of 202 days, excluding missing periods). This site is in a tidal channel at a levee breach where flow is tidally influenced. The water depth of the sensor ranged from 0.19 to 3.71 m and may have been lower during periods of extreme low tide. The sensor elevation was adjusted during inspection on 10/03/2017 and a correction of +0.33 m was added to water depth from 10/03/2017 to 03/13/2017. The elevation (NAVD88) of the ADVM sensor was survey by RTN-GPS. The offset to convert all water depth time-series data to water surface elevation (NAVD88) is -0.18 meters. The instrument temperature ranged from -0.4 to 15.9 degrees C. but may have been bias during periods of low tide due to solar heating of the instrument. Water level in the channel dropped below the elevation of the sensor during periods of low tide. The mean downstream velocity component (Vx) ranged from -0.91 to 1.07 m/s. The mean vertical velocity component (Vy) ranged from -0.20 to 0.26 m/s and signal to noise ratio ranged from 17.6 to 50.4 dB. The ADVM measured the water-velocity profile using a dynamic boundary adjustment mode allowing up to 10 velocity measurements in the water-column profile. Time-series gaps of 15-minutes or more occurred when the instrument was offline or when error thresholds were exceeded. Also at this site, a non-vented, multiparameter sonde (YSI, 600 OMS) measured water depth, water temperature, specific conductance, salinity, and turbidity at 15-minute intervals from October 12, 2016 to March 31, 2017 (123 out of 170 days, excluding missing periods). The depth ranged from 0.06 to 3.66 m. The water temperature ranged from -0.3 to 16.1 degrees C. The specific conductance ranged from 160 to 38,850 micro-siemens per centimeter (uS/cm), and 0.1 to 24.7 practical salinity units (PSU). The turbidity ranged from 2.1 to 1,108 formazin nephelometric units (FNU). This site is also referenced as "USGS 12081518 Area Three near Olympia, WA". Discrete discharge data at this site are available at: https://waterdata.usgs.gov/wa/nwis/inventory/?site_no=12081518&agency_cd=USGS&

An upward-looking acoustic Doppler velocity meter (ADVM, SonTek SW, 3.0 MHz) located in a tidal channel of the Nisqually River Delta at site D4 (N 47d 05’ 37”/W 122d 42’ 18.7”) measured water level and current velocity at 15-minute intervals from October 13, 2016 to May 3, 2017 (158 out of 202 days, excluding missing periods). This site is in a tidal channel at a levee breach where flow is tidally influenced. The water depth of the sensor ranged from 0.19 to 3.71 m and may have been lower during periods of extreme low tide. The sensor elevation was adjusted during inspection on 10/03/2017 and a correction of +0.33 m was added to water depth from 10/03/2017 to 03/13/2017. The elevation (NAVD88) of the ADVM sensor was survey by RTN-GPS. The offset to convert all water depth time-series data to water surface elevation (NAVD88) is -0.18 meters. The instrument temperature ranged from -0.4 to 15.9 degrees C. but may have been bias during periods of low tide due to solar heating of the instrument. Water level in the channel dropped below the elevation of the sensor during periods of low tide. The mean downstream velocity component (Vx) ranged from -0.91 to 1.07 m/s. The mean vertical velocity component (Vy) ranged from -0.20 to 0.26 m/s and signal to noise ratio ranged from 17.6 to 50.4 dB. The ADVM measured the water-velocity profile using a dynamic boundary adjustment mode allowing up to 10 velocity measurements in the water-column profile. Time-series gaps of 15-minutes or more occurred when the instrument was offline or when error thresholds were exceeded. Also at this site, a non-vented, multiparameter sonde (YSI, 600 OMS) measured water depth, water temperature, specific conductance, salinity, and turbidity at 15-minute intervals from October 12, 2016 to March 31, 2017 (123 out of 170 days, excluding missing periods). The depth ranged from 0.06 to 3.66 m. The water temperature ranged from -0.3 to 16.1 degrees C. The specific conductance ranged from 160 to 38,850 micro-siemens per centimeter (uS/cm), and 0.1 to 24.7 practical salinity units (PSU). The turbidity ranged from 2.1 to 1,108 formazin nephelometric units (FNU). This site is also referenced as "USGS 12081518 Area Three near Olympia, WA". Discrete discharge data at this site are available at: https://waterdata.usgs.gov/wa/nwis/inventory/?site_no=12081518&agency_cd=USGS&

An upward-looking acoustic Doppler velocity meter (ADVM, SonTek SW, 3.0 MHz) located in a tidal channel of the Nisqually River Delta at site D3 (N 47d 05’ 36.5”/W 122d 42’ 42.9”) measured water level and current velocity at 15-minute intervals from April 1, 2017 to July 20, 2017 (80.9 days, excluding missing periods). This site is in a tidal channel at a levee breach where flow is tidally influenced. The water depth of the sensor ranged from 0.05 to 3.04 m and may have been lower during periods of extreme low tide. The elevation (NAVD88) of the ADVM sensor was surveyed by RTN-GPS. The offset to convert all water depth time-series data to water surface elevation (NAVD88) is 0.47 meters. The instrument temperature ranged from 7.2 to 23.0 degrees C but may be bias during periods of low tide due to solar heating of the submerged instrument. The mean downstream velocity component (Vx) ranged from -0.81 to 0.81 m/s. The mean vertical velocity component (Vy) ranged from -0.40 to 0.49 m/s and signal to noise ratio ranged from 21.3 to 82.8 dB. The ADVM measured the water-velocity profile using a dynamic boundary adjustment mode allowing up to 10 velocity measurements in the water-column profile. Time-series gaps of 15-minutes or more occurred when the instrument was offline, when error thresholds were exceeded, or when the water level in the channel dropped below the elevation of the sensor during periods of extreme low tide. Discrete discharge data at this site are available at: https://waterdata.usgs.gov/wa/nwis/inventory/?site_no=12081525&agency_cd=USGS&

An upward-looking acoustic Doppler velocity meter (ADVM, SonTek SW, 3.0 MHz) located in a tidal channel of the Nisqually River Delta at site D3 (N 47d 05’ 36.5”/W 122d 42’ 42.9”) measured water level and current velocity at 15-minute intervals from April 1, 2017 to July 20, 2017 (80.9 days, excluding missing periods). This site is in a tidal channel at a levee breach where flow is tidally influenced. The water depth of the sensor ranged from 0.05 to 3.04 m and may have been lower during periods of extreme low tide. The elevation (NAVD88) of the ADVM sensor was surveyed by RTN-GPS. The offset to convert all water depth time-series data to water surface elevation (NAVD88) is 0.47 meters. The instrument temperature ranged from 7.2 to 23.0 degrees C but may be bias during periods of low tide due to solar heating of the submerged instrument. The mean downstream velocity component (Vx) ranged from -0.81 to 0.81 m/s. The mean vertical velocity component (Vy) ranged from -0.40 to 0.49 m/s and signal to noise ratio ranged from 21.3 to 82.8 dB. The ADVM measured the water-velocity profile using a dynamic boundary adjustment mode allowing up to 10 velocity measurements in the water-column profile. Time-series gaps of 15-minutes or more occurred when the instrument was offline, when error thresholds were exceeded, or when the water level in the channel dropped below the elevation of the sensor during periods of extreme low tide. Discrete discharge data at this site are available at: https://waterdata.usgs.gov/wa/nwis/inventory/?site_no=12081525&agency_cd=USGS&

A vented conductivity, temperature and depth sensor (CTD, InSitu Aqua Troll) was installed at site NR1 (N 47d 04’ 16.1”/W 122d 42’ 15.5”) and continuously measured water temperature, water depth, specific conductance, and salinity at 15-minute intervals from February 11, 2016 to July 18, 2016 (159 days). The sensor was replaced with a vented water-level logger (InSitu Level Troll) on July 19, 2016 and deployed until March 19, 2018 (608 days). The site is tidally influenced and located approximately 4.1 km upstream from the mouth of the Nisqually River and within the tidal prism. The elevation (NAVD88) of the top of the deployment pipe was surveyed by RTN-GPS. Tape-down measurements from the top of the pipe to the water surface at the time of water depth measurements by the sensor were used to determine an offset for converting water depth to water surface elevation (NAVD88). The offset needed to convert all water depth time-series data to water surface elevation (NAVD88) is -0.26 meters. Water depth ranged from 1.38 to 4.50 m, water temperature ranged from 2.0 to 20.0 degrees C, specific conductance ranged from 54 to 12,200 (uS/cm), and salinity ranged from 0.0 to 7.0 practical salinity units (PSU). Data gaps of 15-minutes or more were reported as “NA”. Missing Level Troll data occurred from 10/07/2016 to 11/22/2016 and 11/29/2016 to 12/14/2016 and was the result of communication errors with the sensor. This site is also referenced as "USGS 12090248 Nisqually River at I5 near Nisqually, WA". Suspended sediment sample and discrete discharge data at this site are available at: https://waterdata.usgs.gov/wa/nwis/inventory/?site_no=12090248&agency_cd=USGS&. A summary of suspended-sediment sample data are provided with this data release in the file NR1_SSC_summary.csv.

A vented conductivity, temperature and depth sensor (CTD, InSitu Aqua Troll) was installed at site NR1 (N 47d 04’ 16.1”/W 122d 42’ 15.5”) and continuously measured water temperature, water depth, specific conductance, and salinity at 15-minute intervals from February 11, 2016 to July 18, 2016 (159 days). The sensor was replaced with a vented water-level logger (InSitu Level Troll) on July 19, 2016 and deployed until March 19, 2018 (608 days). The site is tidally influenced and located approximately 4.1 km upstream from the mouth of the Nisqually River and within the tidal prism. The elevation (NAVD88) of the top of the deployment pipe was surveyed by RTN-GPS. Tape-down measurements from the top of the pipe to the water surface at the time of water depth measurements by the sensor were used to determine an offset for converting water depth to water surface elevation (NAVD88). The offset needed to convert all water depth time-series data to water surface elevation (NAVD88) is -0.26 meters. Water depth ranged from 1.38 to 4.50 m, water temperature ranged from 2.0 to 20.0 degrees C, specific conductance ranged from 54 to 12,200 (uS/cm), and salinity ranged from 0.0 to 7.0 practical salinity units (PSU). Data gaps of 15-minutes or more were reported as “NA”. Missing Level Troll data occurred from 10/07/2016 to 11/22/2016 and 11/29/2016 to 12/14/2016 and was the result of communication errors with the sensor. This site is also referenced as "USGS 12090248 Nisqually River at I5 near Nisqually, WA". Suspended sediment sample and discrete discharge data at this site are available at: https://waterdata.usgs.gov/wa/nwis/inventory/?site_no=12090248&agency_cd=USGS&. A summary of suspended-sediment sample data are provided with this data release in the file NR1_SSC_summary.csv.

A vented conductivity, temperature and depth sensor (CTD, InSitu Aqua Troll) was installed at site NR3 (N 47o 05’ 12”/W 122o 42’ 22”) and continuously measured water level, water temperature, specific conductance, and salinity at 15-minute intervals from February 12, 2016 to August 7, 2016 (177 days) and from October 7, 2016 to February 8, 2017 (124 days). This site is tidally influenced and located approximately 2.2 km upstream from the mouth of the Nisqually River. Elevation (NAVD88) of the deployment pipe was surveyed by RTN-GPS. Elevation of pipe plus distance to sensor is included in the offset. The offset needed to convert water depth to NAVD88 water surface elevation is -0.31 meters. . Water depth of the sensor ranged from 0.04 to 4.23 m. Temperature ranged from 2.1 to 20.5 C. Specific conductance ranged from 13 to 45,030 microSiemens per centimeter (uS/cm). Salinity ranged from 0.0 to 29.1 practical salinity units (PSU). Water level in the river dropped below the elevation of the sensor during periods of low river flow coincident with low tide. Data gaps of 15-minutes or more were reported as “NA”. Missing data occurred from 01/23/2017 to 01/26/2017 and was the result of vandalism to the sensor cable. NWIS site ID is 12090255 Nisqually River near Nisqually NWR at Nisqually, WA.