Chaco Mesa 1:100000 Quad Hydrography DLGs

Digital line graph (DLG) data are digital representations of cartographic
information. DLG's of map features are converted to digital form from maps and
related sources. Intermediate-scale DLG data are derived from USGS 1:100,000-scale
30- by 60-minute quadrangle maps. If these maps are not available, Bureau of Land
Management planimetric maps at a scale of 1: 100,000 are used. Intermediate-scale
DLG's are sold in five categories: (1) Public Land Survey System; (2) boundaries (3)
transportation; (4) hydrography; and (5) hypsography. All DLG data distributed by
the USGS are DLG - Level 3 (DLG-3), which means the data contain a full range of
attribute codes, have full topological structuring, and have passed certain
quality-control checks.