Water Features as vectors at 1:100,000 resolution. This hydrographic network contains 1:100,000-scale DLG data grouped by its main attribute function as: rivers; streams; ditches and canals; aqueducts; wash and ephemeral drains; flumes, siphons, and penstocks; dams and weirs; tunnels; and undefined water features.
The source of the 1:100,000 resolution coverage was the United States Department of the Interior Geological Survey (USGS) Digital Line Graphs (DLG). The DLG characterization is obtained from the MAJOR and MINOR attribute definitions assigned by the USGS. This was updated by the State Engineering Office (Colorado) and THE IDS Group at Colorado State University.
Original data were derived from USGS topographic maps published at 1:100,000 resolution.
For more information see:
USGS. US GeoData, Digital Line Graphs, Data User Guide 2. United State Department of the Interior. August 1989.
Contact: User Services Branch Earth Science Information Center US Geological Survey 507 National Center Reston, Virginia 22092 (703) 860-6065