A new beamline is being commissioned at the Synchrotron Ultraviolet Radiation Facility (SURF III) on the Gaithersburg, MD campus of the National Institute of Standards and Technology (NIST). SURF III is a 380-MeV synchrotron radiation source providing continuum radiation from the soft x-rays to the infrared. The new beamline is a single facility for ultraviolet measurements spanning the spectral region from near 3 nm (about 400 eV) to 400 nm (3.1 eV). The design of the monochromator allows high-throughput, on-blaze operation over most of this spectral region, with the configuration changing from grazing-incidence at short wavelengths to normal incidence at long wavelengths. NIST will perform calibrations of photodetector responsivity, filter transmission, mirror reflectivity, and other optical characterizations from the extreme ultraviolet into the blue. The beamline provides sufficient optical power to perform radiometric scale realizations with a cryogenic radiometer and can serve as the U.S. national primary measurement standard for detector responsivity throughout the ultraviolet. These diverse capabilities over such a wide spectral range will consolidate the activities of several other calibration and measurement facilities currently in operation within the Ultraviolet Radiation Group.