Digital Hydrologic Cataloging-Unit Boundaries for the Powder River, Wyoming, at 1:24,000 Scale

This data set contains hydrologic cataloging-unit boundaries for
selected units within the Powder River drainage basin of Wyoming. The
hydrologic unit boundaries were delineated by using a
hydrologically-conditioned digital elevation model covering the Powder
River drainage basin to produce preliminary boundaries of smaller
hydrologic units. Interactive editing followed in which the
cataloging-unit boundaries were digitized on computer monitor screens
displaying at least three important reference data layers:
1:24,000-scale U.S. Geological Survey digital raster graphics (images
of topographic quadrangle maps); 1:24,000-scale DEM-derived
preliminary boundaries; and 1:250,000-scale cataloging-unit
boundaries.