Areas of groundwater discharge are hydrologically and ecologically important, and yet are difficult to predict at the river network scale. Thermal infrared imagery can be used to identify areas of groundwater discharge based on an observed temperature anomaly (colder during the late summer or warmer during the late winter). The thermal images, direct temperature measurements (11 cm depth) and discharge zone (seep) location information in this data release were collected as part of a study to evaluate and improve predicted spatial patterns of groundwater discharge. The data were collected during the late summer / early fall of 2017 along selected river reaches in the Farmington River watershed (Connecticut and Massachusetts). This dataset contains 4 files. 1) Images.zip is a zipped directory containing thermal infrared and real color images. 2) Image_Details.csv contains attribute information for each thermal image. 3) ScannedReaches.shp is a shapefile indicating the river reaches that were surveyed. 4) Seeps.shp is a shapefile of groundwater seep locations and attributes that were identified during the fieldwork.