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.