This data release provides gradient self-potential (SP), conductivity, and temperature measurements made during an investigation of surface-water and groundwater exchange in Lake Travis near Austin, Texas, where the Colorado River is incised into the lower-zone, and into several hydrostratigraphic units in the middle zone, of the Cretaceous Trinity aquifer. The voltage, temperature, and conductivity data contained herein were continuously logged along three longitudinal profiles with the logging sensors positioned at depths of 3.0 and 6.1 meters vertically below the surface of Lake Travis, and in a cove along a fourth continuous, non-linear profile of intersecting tracks with the logging sensors positioned at a depth of 6.1 meters beneath the water surface. Each of the longitudinal profiles (Profiles 1–3) began at the Collier boat ramp in Pace Bend Park and ended at the first point-bar downstream from the Hurst Harbor Marina–a distance of about 31 kilometers. A submerged groundwater spring (Deadhead Spring) that discharges from the middle zone of the Trinity aquifer is located along this reach of Lake Travis, and the Bee Creek fault also intersects this reach at two or more different locations. Profile 4 represents a two-dimensional map in the cove. The resulting data sets contained in this data release include over 40,000 measurements of waterborne gradient self-potential, water temperature and conductivity, and the geospatial coordinates of each measurement.