A:
AGRICOLA (AGRICultural OnLine Access) - Search a bibliographic database of citations to the literature of agriculture [Department of Agriculture (USDA), Agriculture Research Service (ARS), National Agricultural Library (NAL)]

ARS Water Database - Source of precipitation and streamflow data from small agricultural watersheds [Department of Agriculture (USDA), Agriculture Research Service (ARS), Hydrology and Remote Sensing Laboratory]

Africa Data Dissemination - Collects, analyzes, and distributes regional, national and sub-national information to decision makers about potential on current famine or flood situations. [Department of the Interior, U.S. Geological Survey (USGS)]

Agricultural chemicals. - Overview of the Toxic Substances Hydrology Program role in investigating the occurrence and fate of agricultural chemicals with links to investigations, headlines, on-line fact sheets, new publications, bibliographies and photo gallery. [Department of the Interior, U.S. Geological Survey (USGS)]

Aquifer basics - Links to general information on water-supply by aquifers based on rock types and to principal national aquifers by name. [Department of the Interior, U.S. Geological Survey (USGS)]

Ask an Earth Scientist - Answers specific questions related to volcanoes, earthquakes and seismology, natural hazards, environment and hydrology, sediments and sedimentary rocks, igneous rocks and minerals [National Aeronautics and Space Administration (NASA)]

B:
Benchmark glaciers - Summary of the USGS benchmark glacier program to intensively monitor climate, glacier motion, glacier mass balance, glacier geometry, and stream runoff at three glacier basins, Gulkana and Wolverine in Alaska and South Cascade in Washington. [Department of the Interior, U.S. Geological Survey (USGS)]

C:
CDC Tsunamis - This page provides information about public health issues related to Tsunamis [Department of Health and Human Services (HHS), Centers for Disease Control and Prevention (CDC)]

Center for Aquatic Resource Studies - Focuses on regional ecological questions raised by both manmade and natural environmental changes [Department of the Interior, U.S. Geological Survey (USGS), Florida Integrated Science Center, Center for Aquatic Resource Studies]

Center for Coastal Monitoring and Assessment (CCMA) - Monitors, surveys, and assesses coastal environmental quality, habitats, and resource distribution [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS)]

Chesapeake Bay Activities - Information on USGS studies of Chesapeake Bay, the nations largest estuary, concerned with water quality, ecosystem history and change, vital habitat and biological resources,and land use studies [Department of the Interior, U.S. Geological Survey (USGS)]

Climate Prediction Center - Famine Early Warning System Network (FEWS-Net); Mesoamerican Famine Early Warning System (MFEWS); Asian Flood Network (AFN). [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Weather Service (NWS)]

D:
Drought Information Center - A roundup of various Web sites and information on drought and climate conditions [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA)]

F:
Fisheries and Aquatic Resources - Resources compiled by NBII about fish and fishing, an NBII Information Node. [Department of the Interior, U.S. Geological Survey (USGS), National Biological Information Infrastructure]

G:
Geosciences Research - Improves the understanding of chemical, biological, and geophysical processes in the subsurface, and how these processes affect water and contaminant transport [Department of Energy (DOE), Idaho National Laboratory (INL)]

Global Hydrology Resource Center (GHRC) - Provides data ingest, archive, and distribution services [National Aeronautics and Space Administration (NASA), Global Hydrology and Climate Center (GHCC)]

Global Hydrology and Climate Center (GHCC) - Studies the global water cycle and its effect on the climate [National Aeronautics and Space Administration (NASA)]

Great Lakes Environmental Research Laboratory (GLERL) - Conducts integrated, interdisciplinary environmental research in support of resource management and environmental services in coastal and estuarine water, with special emphasis on the Great Lakes [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Centers for Coastal Ocean Science]

Ground Water and Drinking Water - Links and information on safe drinking water [Environmental Protection Agency (EPA), Office of Ground Water and Drinking Water (OGWDW)]

Ground water information pages - Lead page to connect to ground-water information on the Nations ground-water resources and ground-water activities of the USGS. Includes links to ground-water data, new reports, publications, field techniques, models, programs, and issues [Department of the Interior, U.S. Geological Survey (USGS), Office of Ground Water]

H:
Hydrologic Data Systems (NHDS) - Provides access to historical data for use in calibration of hydrologic models and development of hydrometeorologic techniques [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Weather Service (NWS), Office of Hydrologic Development (OHD)]

Hydrologic Information Center - Current and historical information on flooding and other hydrologic conditions [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Weather Service (NWS)]

Hydrologic Instrumentation Facility (HIF) - Serves as a center for the collection and dissemination of information concerning hydrologic field instrumentation [Ad Hoc Organizations, Federal Geographic Data Committee]

Hydrology Technical Group - Carries out a variety of research on groundwater movement and the effects of dams [Department of Energy (DOE), Pacific Northwest National Laboratory (PNNL)]

Hydrometeorologic Design Studies Center (HDSC) - Prepares and publishes U.S. design standards and estimates for probable maximum precipitation (PMP) and precipitation frequency (PF) [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Weather Service (NWS), Office of Hydrologic Development (OHD)]

Hydrometeorological Automated Data System (HADS) - Provides data from more than 8,800 locations at which hydrologic and/or meteorologic information is observed [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Weather Service (NWS)]

I:
Index of Watershed Indicators (IWI) - Compilation of information on the health of aquatic resources in the United States [Environmental Protection Agency (EPA)]

Institute of Geophysics and Planetary Physics (IGPP), Lawrence Livermore National Laboratory - Research in the physics and chemistry of the solid Earth, including seismology, geochemistry, experimental petrology, mineral physics, active tectonics, and hydrology [Department of Energy (DOE), Lawrence Livermore National Laboratory (LLNL)]

M:
Managing water in the American West - Science and Technology Program. [Department of the Interior, Bureau of Reclamation]

N:
National Atmospheric Deposition Program/National Trends Network (NADP/NTN) - Access data from a nationwide network of precipitation monitoring sites [Multiple agencies involved]

National Drought Mitigation Center - Forecast of U.S. drought conditions [Multiple agencies involved]

National Hydrography Dataset (NHD) - A comprehensive set of digital spatial data about surface water features, with links to references, data, software tools, applicatons, tutorials, technical support, and data maintenance [Department of the Interior, U.S. Geological Survey (USGS)]

National Operational Hydrologic Remote Sensing Center (NOHRSC) - Issues river and flood forecasts and provides hydrometeorological data and products to support water resources managers [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Weather Service (NWS)]

National Research Program (NRP) for water resources - Supports hydrologic research in support of the mission of the U.S.Geological Survey. Site provides links to search for current projects and for postdoctoral opportunities [Department of the Interior, U.S. Geological Survey (USGS)]

National River Restoration Science Synthesis - A scientific synthesis of river restoration projects, with a searchable database. [Department of the Interior, U.S. Geological Survey (USGS), National Biological Information Infrastructure]

National Soil Tilth Laboratory (NSTL) - Research for the development and evaluation of management practices that enhance water quality while ensuring conservation of the nation's soil and water resources [Department of Agriculture (USDA), Agriculture Research Service (ARS)]

National Stream Quality Accounting Network (NASQAN) - Homepage description, a long-term program monitoring the concentrations and flux of sediment and chemicals in the Nation's largest rivers (Mississippi, Columbia, Colorado, Rio Grande, and Yukon) [Department of the Interior, U.S. Geological Survey (USGS)]

National Streamflow Information Program - Home page describing the operation and maintenance of 7000 streamgages, overview of the program, system for collection of streamflow data, maintaining of historic streamflow data, and available reports [Department of the Interior, U.S. Geological Survey (USGS)]

National Water Conditions - Historical maps and animations of maps for monthly and annual streamflow conditions by water year showing generalized contour patterns of streamflow conditions. Maps are for the United States, Canada, and Puerto Rico [Department of the Interior, U.S. Geological Survey (USGS)]

National Water Quality Laboratory (NWQL) - A full-service laboratory that specializes in environmental analytical chemistry and has a primary role to develop new analytical methods. Links to directory, publications, and standards [Department of the Interior, U.S. Geological Survey (USGS)]

National Water and Climate Center (NWCC) - Develops and transfers water and climate information and technology [Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS)]

National Water-Quality Assessment (NAWQA) Program - Primary homepage for studying water quality in river, aquifer and coastal water basins throughout the nation. Links to reports, data, models, maps and national synthesis studies [Department of the Interior, U.S. Geological Survey (USGS)]

National Water-Quality Assessment (NAWQA) Program: reconstructed trends national synthesis study - Program compiles data to study national trends with links to sediment coring sites, video on Salt Lake City, study units identification, and publications [Department of the Interior, U.S. Geological Survey (USGS), National Water-Quality Assessment Program (NAWQA)]

North Appalachian Experimental Watershed Unit (NAEW) - Conducts research on hydrology, surface runoff, groundwater quality, and erosion in an agricultural context [Department of Agriculture (USDA), Agriculture Research Service (ARS)]

Nutrients National Synthesis Project - National assessment of nutrients in the streams, rivers, and ground water of the U.S. [Department of the Interior, U.S. Geological Survey (USGS), National Water-Quality Assessment Program (NAWQA)]

O:
Office of Hydrologic Development (OHD) - Involved in hydrologic predictions and analyses leading to the application of new scientific and computer technologies for hydrologic forecasting and related water resources problems [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Weather Service (NWS)]

P:
Pasture Systems and Watershed Management Research Laboratory (PSWMRL) - Conducts research leading to the development of land, water, and plant management systems of northeastern grazing and cropping enterprises while maintaining the quality of ground and surface waters [Department of Agriculture (USDA), Agriculture Research Service (ARS)]

R:
Recreation site (USGS), your science gateway for safe and vital enjoyment of the outdoors - Gateway to useful USGS websites for recreation in nature watching and exploring, boating, camping, climbing, fishing, hiking,biking, and hunting, with links to maps, real-time streamflow, geology, photos, and plant and animal information [Department of the Interior, U.S. Geological Survey (USGS)]

S:
South Florida Water Management District (SFWMD.gov) - Managing and protecting the waters of South Florida. [Multiple agencies involved]

Southwest Watershed Research Center - Research is conducted in erosion & sedimentation, hydrology, decision support systems, remote sensing [Department of Agriculture (USDA), Agriculture Research Service (ARS)]

State Water Resources Research Institute (WRRI) Program - Homepage with links to institutes, projects, and programs [Department of the Interior, U.S. Geological Survey (USGS), Water Resources Research Institute (WRRI)]

Stream Systems Technology Center - Access to information, documents, and video recordings related to fluvial geomorphology [Department of Agriculture (USDA), Forest Service]

Subsurface Science - Research to expand the understanding of subsurface contaminant fate and transport in order to develop and validate reliable predictive models [Department of Energy (DOE), Idaho National Laboratory (INL)]

Surf Your Watershed - A service to help you locate, use, and share environmental information [Environmental Protection Agency (EPA)]

Surface water information pages - Lead page for detailed United States surface water information with links to real-time and historic streamflow data, suspended sediment data, USGS programs and facilities, publications, techniques, and featured news releases [Department of the Interior, U.S. Geological Survey (USGS), Office of Surface Water]

Sustainability of semi-Arid Hydrology and Riparian Areas (SAHRA) - Promotes sustainable management of water resources in semi-arid regions using efforts that span the physical and behavioral sciences [National Science Foundation (NSF), Science and Technology Centers (STC)]

T:
Toxic Substances Hydrology Program - Homepage which provides scientific information on contaminated sites and on human and environmental health. Links to news, topical information, investigations, meetings, publications, and photos [Department of the Interior, U.S. Geological Survey (USGS)]

U:
U.S. Geological Survey (USGS), Department of the Interior - Homepage, serving as portal to all USGS information with search options, USGS in the news, most frequently requested topics, and access to major categories of USGS information [Department of the Interior, U.S. Geological Survey (USGS)]

V:
Visible Earth - A searchable directory of images, visualizations, and animations to the Earth [National Aeronautics and Space Administration (NASA)]

W:
Water - Provides links to all of EPA's major water topics [Environmental Protection Agency (EPA)]

Water Management - Provides information about water management publications available for sale from the U.S. Government Bookstore [Government Printing Office]

Water Resources Real-time data for the Nation - Access to national water resources real-time data typically recorded at 15-60 minute intervals, stored onsite, and then transmitted to USGS offices every 4 hours. Select for site information, ground water, surface water,and water quality [Department of the Interior, U.S. Geological Survey (USGS)]

Water Resources of the United States - Primary homepage for USGS programs in water resources with links to water data, publications and products, technical resources, major programs, and water information services [Department of the Interior, U.S. Geological Survey (USGS)]

Water Use in the United States - Links to water use reports for the United States for 1985, 1990, and 1995, comparison of use and renewable water supply by region, handbook for collecting water-use data, and other information on national water use [Department of the Interior, U.S. Geological Survey (USGS)]

Water Watch: current water resources conditions - U.S. map of real-time streamflow compared to historical values with links to U.S. maps and data of surface water, ground water, precipitation, river conditions and floods and other information on current and past water resources conditions [Department of the Interior, U.S. Geological Survey (USGS)]

Water science for schools - Homepage of an educational site for elementary school students with links to water subjects including water basics, water questions and answers, water use, picture gallery, glossary, NavGuide, and certificate of completion. [Department of the Interior, U.S. Geological Survey (USGS)]

William R. Wiley Environmental Molecular Sciences Laboratory (EMSL) - Research is on focused on developing a molecular-level understanding of the physical, chemical and biological processes that underlie the most critical environmental issues [Department of Energy (DOE), Pacific Northwest National Laboratory (PNNL)]