Useful Internet Sites for GIS and Water Resources

Data for the United States


Geospatial One Stop

A central source for US Government data.   This is a very large compendium of data sources and also information about data.


Water Resources Maps and GIS Information A link to 12 data sources with map data from the USGS or organizations connected with the USGS.


Hydrologic Unit Maps (HUC)


Get the data

The 8-digit hydrologic cataloging units are the basic water resources subdivision of the United States
Watershed Boundary Dataset (12 digit HUCs for the US)


EPA Reach File 1 (RF1), Version 2.0


Get the data   It used to be that you could get RF1 for each 2-digit water resources region of the nation separately, but it appears that is no longer the case, and this file contains RF1 for the whole nation.


EPA Basins Model


Get the data

Contains a large inventory of environmental data organized by 8-digit hydrologic cataloging units


National Hydrography Dataset (NHD)


Get the data

NHD in Geodatabase

NHDPlus A dataset that integrates the National Hydrography, Elevation, and Land Cover Datasets.


Digital Elevation Models (DEMs) for the United States

Seamless data distribution from EROS Data Center


US Coastline from National Geophysical Data Center

Coastline Extractor


USDA Soils Data

Statsgo – State Soil Database (1:250,000 scale)

Ssurgo – County Soil Database

Statsgo is available for the whole United States.  Ssurgo is much more detailed but is available only in some counties.  For an exercise on how to interpret Statsgo, see:

USDA Data Gateway


Land Use/Land Cover Data

National Land Cover Institute

Land cover data on the seamless server

Land Cover Change 1992 to 2001

Exercise on analyzing Land Cover Change

National Wetlands Inventory Center

National Atlas of the United States



National Climate Data Center

NCDC Climate Data Online

            Description of how to use Climate Data Online:


USDA Water and Climate Center (PRISM maps of mean precipitation)

For an exercise using PRISM and land cover data to estimate nonpoint source pollution, see:


National Center for Atmospheric Research  DayMet

Gridded daily precipitation and temperature on a 1 km grid, 1980—1997.


Nexrad stage III precipitation data and procedures for using it (  (No more recent than 2005 and rather awkward to use)


University of Washington gridded meteorological data


NRCS National Water and Climate Center that includes water supply forecasts, snow, precipitation and temperature.

SNOTEL real time snow data 


Water Resources

USGS National Water Information System

Real Time USGS Data on Water Watch

CUAHSI Hydrologic Information System

WaterOneFlow web services for water data




Free Landsat Scenes
NASA Land Processes DAAC


Global Data

Digital Chart of the World

Shuttle Radar Topography Mission (SRTM)

HydroSheds – hydrologic derivative datasets from SRTM


GTOPO30 - 30 arc-second cell (1:1,000,000 scale) global DEM

Hydro1K – hydrologic derivative datasets from GTOPO30

Global Water and Energy Experiment (GEWEX)

WaterGap – world water resources and water use



Texas Data

Texas Natural Resource Information System

Texas Water Development Board GIS Data



Utah Data

Utah Automated Geographic Reference Center contains USGS Maps, DEM's, Orthophoto quads within Utah.  Also includes if you look hard enough, liquefaction potential, Hydrography and Environmental data for certain locations. Also – 2 m resolution bear earth LIDAR data for Wasatch front.
Western Regional Climate Center
Bear River Watershed Information System.
Great Salt Lake Basin Hydrologic Observatory.
Utah Climate Center.

Nebraska Data


Geospatial OneStop for Nebraska

Nebraska View (CALMIT)

NE Digital Data Bases (Conservation and Survey Division)

National Drought Mitigation Center

High Plains Regional Climate Center