The Cosmic Ray Energy Spectrum as measured in Monocular Mode by the High Resolution Fly's Eye Experiment

We report on the cosmic ray energy spectrum above 3 x 1018 eV as measured by the HiRes detector running in monocular mode (BigH). We also investigate the existence of the predicted GZK cuto at 6 x 10^19 eV. Preliminary results are consistent with the Fly's Eye monocular spectrum. Construction of BigH was completed in the early months of 1997, data taking started in may of the same year. Data collected in the period May 1997 - November 1998 is used in this study. Aperture calculation, shower reconstruction techniques, and resolution issues are discussed.