Residual total-intensity aeromagnetic, complete-Bouguer gravity anomaly, and generalized geologic map compilations are presented for the U.S. Geological Survey's Basin and Range-Colorado Plateau ("BARCO") study area at a scale of 1:250,000. The area of coverage is a 1.5° x 3° (264 km by 165 km) rectangular block across the structural transition from Basin and Range to Colorado Plateau in the general vicinity of the Hurricane and Grand Wash-Gunlock faults and Pine Valley laccolith. The aeromagnetic map is a composite of seven previously published maps (from surveys flown at 400 ft and 1000 ft draped and 9000 ft and 12,000 ft barometric elevations) and is contoured at an interval of 20 nT. The gravity map was constructed using data from 6919 stations, mostly from Defense Mapping Agency files but including about 700 stations established over the past several years by the USGS. All data are computer-terrain-corrected to 167 km (Hayford-Bowie zones A-0) and the Bouguer anomalies are contoured at an interval of 2 mGals. The geologic map shows seven generalized rock units with strongly contrasting bulk magnetization and density.