Groundwater is often supersaturated in greenhouse gases (GHGs; i.e. CO2, CH4, N2O) and delivers these gasses to stream channels where they are either emitted, consumed, or transported downstream. However, areas of relatively spatially-focused (‘preferential’) groundwater discharge may also be located above the waterline and be immediate sources of GHGs to the atmosphere before moving down the streambank and mixing with surface waters. The rate at which groundwater discharges from exposed streambanks may alter the amount of instantaneous emissions that occur at preferential groundwater discharge zones. To quantify vertical groundwater flux rates from exposed preferential groundwater discharge points along exposed streambanks, we deployed temperature loggers (iButton #DS1922L, Maxim Integrated, Inc., San Jose, CA, USA) in vertical profilers into thermally-identified groundwater discharge points along streambanks at two sites within the Farmington River watershed (northwestern CT and southwestern MA, USA) with varying streambank organic matter content. Stratton Brook is a 2nd order tributary to the Farmington River. The surficial sediments at this tributary include sand and gravel, with some areas being comprised of fines and thin and thick till deposits (Stone et al. 1992). Stratton Brook streambanks are composed of unconsolidated sediment with high organic matter deposits. Surrounding landcover include forest, forested wetlands, housing developments, and a public forested park . West Branch Salmon Brook is a 3rd order tributary to the Farmington River. Its local landcover includes forest, agriculture, a public park, and housing developments. Surficial sediments include a blend of alluvium atop of gravel and sand from postglacial deposits, thick and thin till, and coarse gravel deposits (Stone et al. 1992). Streambank sediment is poorly sorted, ranging from large cobbles to fine sand. Vertical temperature profiler (VTP) data were collected at 20 distinct preferential groundwater discharge points from September 9 to October 31, 2021. For West Branch Salmon Brook, the temperature data was collected at 20 distinct preferential groundwater discharge points from September 14 to October 31, 2021, for a total of 40 monitored locations. Stone, J. R., Schafer, J. P., London, E. H., & Thompson, W. B. (1992). Surficial materials map of Connecticut. Reston, VA: US Geological Survey. https://doi.org/10.3133/70046712