Digital Line Graphs (DLG)

DLG map of 1:2,000,000-Scale DLG data of the Illinois and Missouri States.

DLGs - Digital Line Graphs produced by the United States Geological Survey. DLGs consist of several layers of 1:24,000 map scale (vector) data for each USGS defined quad: boundaries, hydrography, vegetative surface cover, non-vegetative features, roads and trails, railroads, pipe and trans lines, and manmade features. Also included in this dataset is a hypsography (elevation contour) layer, nine layers in all. Data are projected in UTM coordinates using datum NAD83.
http://edc2.usgs.gov/geodata/images/hydro.gif