There are several Internet sites that specialize in information about streams, rivers and lakes around the world. NASA's Marshall Space Flight Center maintains the Global Hydrology and Climate Center, while the United States Geological Survey (USGS) maintains a comprehensive web site covering water quality, surface and groundwater monitoring, lake levels, discharge rates and other facets of continental hydrology.

Streamflow map from USGS

For more hydrological data and information, try these web sites as well:

• NASA's Hydrological Sciences Branch at Goddard Space Flight Center
• National Water and Climate Center at the Natural Resources Conservation Service
• US National Weather Service listing of web sites providing hydrological information
• CSIRO's Division of Water Resources for Australia
• The Danish Hydrologic Institute
• The Global River Discharge Database
• The World's Water
• Great Lakes Ecological Assessments for Rivers, Lakes and Streams
• Department of Hydrology and Water Resources at the University of Arizona
• National Operational Hydrologic Remote Sensing Center
• NOAA Great Lakes Hydrology
• Illinois State Water Survey
• United Nations Global Environmental Monitoring System
• USGS Water Resources of the US
• WaterWatch - real-time streamflow in the US from USGS
• For more hydrological links, check out the GCMD links page.