Depth-to-bedrock mapping of Grant County provides baseline information on unconsolidated surficial sediment thickness across the county. Bedrock aquifers in Grant County are susceptible to contamination from various land use activities, and depth to bedrock represents one of several factors affecting aquifer susceptibility. The results of this study produced a depth-to-bedrock raster that has a cell size of 32.8 ft (10 m). When used alongside water-table maps, bedrock and surficial geologic maps, as well as land use maps, depth to bedrock can help assess aquifer susceptibility.