In September and November 2023, the U.S. Geological Survey, in cooperation with the New York State Department of Environmental Conservation, collected geophysical surveys of 5 karst drainage features (sinkholes) in eastern Genesee County, New York, in order to study the nature of the subsurface fill material, bedrock topography, and karst dissolution features. Sites were surveyed using multiple geophysical techniques, including frequency-domain electromagnetics, ground-penetrating radar, electrical-resistivity tomography, passive seismic, and seismic refraction tomography.