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.