• The National Map
  An online interactive map created by the USGS that includes data produced by a consortium of federal, state, and local partners. Also provides downloadable digital data.
• National Atlas of the United States
  The National Atlas provides maps of the enormous wealth of data collected by the Federal Government. In addition to having high-quality, small-scale maps, the atlas includes digital data for download.
• Ground Water Atlas of the United States
  Describes the ground-water resources of thirteen regional areas that collectively cover the 50 States, Puerto Rico, and the U.S. Virgin Islands. Some areas are fully illustrated; others are still under construction. The Map Library has the full set of these Hydrologic Atlases (HA-730).
• Spatial Data Transfer Standard (SDTS) Information Site
  The Spatial Data Transfer Standard provides a means of transferring spacial data between dissimilar computer systems with the potential for no data loss.
• USGS Topographic Map Symbols
  A mapping reference guide to the current USGS Topographic Map symbols.
• USGS National Seismic Hazard Maps
  Part of the Earthquake Hazards program. The USGS provides seismic hazard assessments for the U.S. and areas around the world.


Publications & Data
• Publications Warehouse
  Search citations for over 70,000 USGS publications. Citations are linked to online content, where available. Browse lists of recent publications. Check availability, price, and purchase options for publications.
• National Geologic Map Database
  Search this USGS database for geologic, geophysical, geochemical, geochronologic, and paleontologic maps and information.
• USGS Central Region Publications
  The Central Regional office website contains lists of recent additions, digital geologic maps, information, and other data (mainly PDF formats).
• USGS Digital Maps & Data
  General information about the USGS's digital data, and specific information about datasets such as DRG, DEM, DLG, DOQ, the National Atlas of the United States, NHD, NED, Landcover data, and more.
• USGS Geographical Data Download
  Free USGS DLG, DEM, LULC, and NLCD data in SDTS format for all states for download.
• USGS Map Dealers in Colorado
  Information and links to map vendors in Colorado.
• USGS Store
  Search for or browse available USGS products.


USGS Programs
• Rocky Mountain Mapping Center
  The Educational Resources program at the Rocky Mountain Mapping Center provides great maps and GIS educational activities and lesson plans.
• Geology Program
  Includes links to geologic mapping, natural hazards programs, and natural resources programs.

 

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