Each year, snow-melt runoff flows through the Snohomish River and pours into the Snohomish River Estuary in Possession Sound, located in the Whidbey Basin of Washington State, resulting in a water-layering phenomenon. Cold snow-melt freshwater layers above relatively warmer, saltier Sound water. The Ocean Research College Academy (ORCA) collects data from two instruments in the Everett Marina, located just south of the Snohomish River mouth. Data from ORCA and the United States Geological Survey (USGS) were analyzed to investigate seasonal variations in current velocity, water temperature, and Snohomish River discharge; variables that have not been previously investigated in this region through a correlational lens. The current working hypothesis is that observed water current patterns over time in Possession Sound can be correlated to trends in water velocity, temperature, and discharge. This study uses data collected during deployments of an Acoustic Doppler Current Profiler (ADCP) in 2017 and 2020. The ADCP was located 0.45 meters above the seafloor of the main river channel near Everett Marina, providing consistent water temperature measurements at the instrument fixed base and current velocity measurements at 0.5- to 1-meter increments throughout the water column. A conductivity, temperature, and depth sonde (CTD) was attached to a dock at Everett Marina, 2 meters below the water surface, allowing the CTD to rise and fall with the tide. Water temperatures from the CTD and ADCP give a comprehensive overview of the middle and bottom layers of the estuary. Seasonal current changes can be determined with current velocity data measured by the ADCP and correlated against USGS river discharge data. Preliminary results indicate some temporally condensed variations, such as autumnal semimonthly current velocity changes in deeper waters. This investigation and analysis can offer insight into some of the effects these variables may have on the local water system.