DEMs are in grid format with a 30-meter horizontal grid spacing.

Scale:  1:24,000.  Projection:   UTM Zone 14 or UTM Zone 13.  Datum:  NAD83.

Each zipped file contains up to 64 DEM grids that comprise the 1x1-degree block.  The files must extracted with the "Use folder Names" option to preserve the file folder structure.  The files can be added as a grid into GIS software.