Water Resources of the United States


State-based Flood Information

There is a USGS Water Science Center office in each State. Alabama Arkansas Illinois Indiana Kansas Louisiana Montana North Dakota Oklahoma Tennessee Wyoming Texas Alaska Arizona California Caribbean Colorado Connecticut Florida Georgia Hawaii Idaho Iowa Kentucky Maine Maryland-Delaware-D.C. Massachusettes Michigan Minnesota Mississippi Missouri Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina Ohio Oregon Pennsylvania Rhode Island South Carolina South Dakota Utah Vermont Virginia Washington West Virginia Wisconsin

Click a State to go to the specific flood page for that State or Region (if available).

Other Notable Resources

(Note: Links to outside websites do not imply endorsement by the U.S. Geological Survey.)

NOAA’s Coastal County Snapshots - Find out what your coastal county looks like in terms of jobs, flood risk, wetland resources, and other economic and environmental factors.
U.S. Water Monitor - A convenient collaborative mash-up of national-level water monitoring maps.
MRCC cli-MATE - Midwestern Regional Climate Center's application for accessing climate information (free registration required).
FEMA Works with USGS - Video showing an example of USGS / FEMA cooperative efforts.
Tri-Agency Fusion Team
Ohio River Basin Flood Outlook from NWS
Sea Level Rise Tool For Hurricane Sandy Recovery from globalchange.gov
Community Collaborative Rain, Hail & Snow Network - low-cost, volunteer-based precipitation map.

USGS Contact Information

For questions related to this site or to contribute content, please email TODD KOENIG or BOB HOLMES at the USGS Office of Surface Water.

USGS Flood Information   

The USGS provides practical, unbiased information about the Nation's rivers and streams that is crucial in mitigating hazards associated with floods. This site provides information about the USGS activities, data, and services provided during regional high-flow events, such as hurricanes or multi-state flooding events. The USGS response to these events is typically managed by the National Floods Specialist.

The Flood Resources page presents USGS tools, websites, publications, and other resources for monitoring, studying, and communicating flood information.
Choose a topic of interest from the filter bar below or choose "All Flood Resources":

  • thumbnail linked to FloodWatch

    Flood Watch

    The USGS FloodWatch website is a map-based resource from USGS WaterWatch that gives users hourly visual updates for flood conditions at over 3000 locations across the United States. Click the map on the left to interact with the map or click here to learn how to use this map.

    thumbnail of example USGS reports

    USGS Flood Reports

    This website aggregates links to selected USGS reports which focus on floods and flood-related research.

    thumbnail linked to flood inundation mapper

    USGS Flood Inundation Mapping Program

    The USGS Flood Inundation Mapping Program (FIM) partners with local communities and other government agencies to develop and validate flood inundation map libraries. Click the title above to visit the USGS FIM website and learn more about available tools. Completed projects are collected on the USGS National Flood Inundation Mapper, brought to you by the USGS Wisconsin Internet Mapping Group (WiM). Click the image on the left to go straight to the Mapper.

    thumbnail of USGS Water Science School website

    USGS Water Science School

    The USGS Water Science School offers comprehensive, down-to-earth information on many aspects of water, along with pictures, data, maps, and an interactive center where you can give opinions and test your water knowledge

    thumbnail of USGS CO flood database map

    Interactive Historic Flood Maps

    Learn about past flooding through State-based USGS flood databases. Use one of the links below to access available databases.
    Colorado Flood Database
    Oklahoma Flood Database

    thumbnail of USGS StreamStats website

    StreamStats

    The USGS StreamStats website is a GIS-based web tool for estimating streamflows at gaged and ungaged locations. Features similar to the NSS program are presented to users with no programs to install. Users can visit the StreamStats website linked here and click on a stream location on the interactive map to compute estimated streamflows for floods and other statistics. Additional statistics at gaged locations are also presented.

    thumbnail of USGS WaterAlert website

    USGS WaterAlert

    Select your favorite USGS streamgage from the USGS WaterAlert map, then set water stage or streamflow thresholds to receive instant notifications sent to your email address or mobile device. Click the image at left or the title above to go to the map and select your site(s).

    thumbnail of USGS WaterNow website

    USGS WaterNow text service

    Want to know what's happening right now? Request real-time information from any USGS streamgage with the USGS WaterNow text service. This service responds to your text message with information about the current stage, streamflow, or other parameters collected at the gage. Click the image at left or the title above to learn how.

    thumbnail of USGS Streamer website

    Streamer

    The USGS Streamer is a super-friendly interactive map that helps you explore America's larger streams by tracing upstream to their sources or downstream to where they empty. The map includes layers for weather radar and near-real-time streamflow conditions.

    thumbnail of USGS 100-yr-flood poster

    Poster: 100-Year Flood--It's All About Chance

    How can a 100-year flood strike twice in 15 years? This is a downloadable poster discussing the meaning and use of probability language in flood characterization.

    thumbnail of USGS flood anatomy video

    Video: The Anatomy of Floods

    Dr. Robert Holmes discusses causes and effects of flooding, including a look at aspects of the 2011 epic flooding, and how USGS science assists in the overall flood mitigation efforts of the United States.

    thumbnail of USGS emergency management link

    USGS Emergency Management Website

    The USGS Natural Hazards Mission Area has been given responsibility for overseeing the bureau's emergency management activities. This function includes the USGS Hazard Response Executive Committee, which provides executive direction, oversight, and support to USGS managers in responding to major hazard events. During incidents of national significance, the USGS provides support to certain National Response Framework emergency support functions.

  • thumbnail linked to FloodWatch

    Flood Watch

    The USGS FloodWatch website is a map-based resource from USGS WaterWatch that gives users hourly visual updates for flood conditions at over 3000 locations across the United States. Click the map on the left to interact with the map or click here to learn how to use this map.

    thumbnail linked to flood inundation mapper

    USGS Flood Inundation Mapping Program

    The USGS Flood Inundation Mapping Program (FIM) partners with local communities and other government agencies to develop and validate flood inundation map libraries. Click the title above to visit the USGS FIM website and learn more about available tools. Completed projects are collected on the USGS National Flood Inundation Mapper, brought to you by the USGS Wisconsin Internet Mapping Group (WiM). Click the image on the left to go straight to the Mapper.

    thumbnail of USGS Flood Event Viewer

    USGS Flood Event Viewer

    The USGS operates an event-based mobile storm-surge sensor network to capture information about coastal and inland storm tides. Click the title above to learn more about the USGS Short-Term Network, or click the image at left to go straight to the USGS Flood Event Viewer.

    Internal USGS users can login to the Short-Term Network application here.

    thumbnail of USGS NWIS peak streamflow website

    USGS Peak Streamflow Data

    The National Water Information System (NWIS) is the USGS water data portal where you can find a wealth of historic and real-time data related to floods. Click the image at left or the title above to go to the NWIS website where you can query for peak streamflow data by station, State, or region. Or, click here to go to the main NWIS page for a broader range of data.

    thumbnail of USGS WaterAlert website

    USGS WaterAlert

    Select your favorite USGS streamgage from the USGS WaterAlert map, then set water stage or streamflow thresholds to receive instant notifications sent to your email address or mobile device. Click the image at left or the title above to go to the map and select your site(s).

    thumbnail of USGS WaterNow website

    USGS WaterNow text service

    Want to know what's happening right now? Request real-time information from any USGS streamgage with the USGS WaterNow text service. This service responds to your text message with information about the current stage, streamflow, or other parameters collected at the gage. Click the image at left or the title above to learn how.

    thumbnail of USGS Streamer website

    Streamer

    The USGS Streamer is a super-friendly interactive map that helps you explore America's larger streams by tracing upstream to their sources or downstream to where they empty. The map includes layers for weather radar and near-real-time streamflow conditions.

    thumbnail of USGS emergency management link

    USGS Emergency Management Website

    The USGS Natural Hazards Mission Area has been given responsibility for overseeing the bureau's emergency management activities. This function includes the USGS Hazard Response Executive Committee, which provides executive direction, oversight, and support to USGS managers in responding to major hazard events. During incidents of national significance, the USGS provides support to certain National Response Framework emergency support functions.

    thumbnail of USGS storm tide gage

    USGS Surge, Wave, and Tide Hydrodynamics (SWATH) Network

    SWaTH is a system of flood-hardened, real-time telemetered tide gages, rapid deployment gages, and storm tide sensors deployed in integrated network configurations along the Northeastern Atlantic Coast from North Carolina to Maine.

  • thumbnail linked to flood inundation mapper

    USGS Flood Inundation Mapping Program

    The USGS Flood Inundation Mapping Program (FIM) partners with local communities and other government agencies to develop and validate flood inundation map libraries. Click the title above to visit the USGS FIM website and learn more about available tools. Completed projects are collected on the USGS National Flood Inundation Mapper, brought to you by the USGS Wisconsin Internet Mapping Group (WiM). Click the image on the left to go straight to the Mapper.

    thumbnail of USGS Flood Event Viewer

    USGS Flood Event Viewer

    The USGS operates an event-based mobile storm-surge sensor network to capture information about coastal and inland storm tides. Click the title above to learn more about the USGS Short-Term Network, or click the image at left to go straight to the USGS Flood Event Viewer.

    Internal USGS users can login to the Short-Term Network application here.

    thumbnail of USGS storm tide gage

    USGS Surge, Wave, and Tide Hydrodynamics (SWATH) Network

    SWaTH is a system of flood-hardened, real-time telemetered tide gages, rapid deployment gages, and storm tide sensors deployed in integrated network configurations along the Northeastern Atlantic Coast from North Carolina to Maine.

  • thumbnail of USGS PeakFQ program

    USGS At-Site Peak Flood Frequency Computation Program (PeakFQ)

    PeakFQ implements both the Bulletin 17B and Expected Moments Algorithm (EMA) procedures for flood-frequency analysis of peak streamflow records, providing estimates of flood magnitudes and their corresponding variance for a range of 15 annual exceedance probabilities. PeakFQ reads annual peaks in the standard peakfq (WATSTORE) text format available from NWISWeb

    thumbnail of USGS NSS program

    USGS National StreamFlow Statistics Program (NSS)

    USGS researchers across the nation have developed equations for estimating flood streamflows as well as other statistics at ungaged sites. These equations are collected for easy access and computation through the downloadable NSS program and the associated NSS/StreamStats database. Users can download the NSS program and database from the NSS website linked here. Users will also find reports detailing the development and proper use of every equation in the NSS/StreamStats database.

    thumbnail of USGS StreamStats website

    StreamStats

    The USGS StreamStats website is a GIS-based web tool for estimating streamflows at gaged and ungaged locations. Features similar to the NSS program are presented to users with no programs to install. Users can visit the StreamStats website linked here and click on a stream location on the interactive map to compute estimated streamflows for floods and other statistics. Additional statistics at gaged locations are also presented.

    thumbnail of USGS SWSTAT program

    USGS Surface Water Statistics Program (SWSTAT)

    The USGS SWSTAT program contains a number of options for statistically analyzing time-series data. Output options include minimum, maximum, mean, and standard deviation of a time-series, as well as flow-duration analyses, log-Pearson Type III frequency analyses, trends, and others using standard textbook procedures. Click the title above or the image at left to go to the SWSTAT website.

    thumbnail of USGS 100-yr-flood poster

    Poster: 100-Year Flood--It's All About Chance

    How can a 100-year flood strike twice in 15 years? This is a downloadable poster discussing the meaning and use of probability language in flood characterization.

  • thumbnail of example USGS reports

    USGS Flood Reports

    This website aggregates links to selected USGS reports which focus on floods and flood-related research.

    thumbnail of USGS Flood Event Viewer

    USGS Flood Event Viewer

    The USGS operates an event-based mobile storm-surge sensor network to capture information about coastal and inland storm tides. Click the title above to learn more about the USGS Short-Term Network, or click the image at left to go straight to the USGS Flood Event Viewer.

    Internal USGS users can login to the Short-Term Network application here.

    thumbnail of USGS Water Science School website

    USGS Water Science School

    The USGS Water Science School offers comprehensive, down-to-earth information on many aspects of water, along with pictures, data, maps, and an interactive center where you can give opinions and test your water knowledge

    thumbnail of USGS CO flood database map

    Interactive Historic Flood Maps

    Learn about past flooding through State-based USGS flood databases. Use one of the links below to access available databases.
    Colorado Flood Database
    Oklahoma Flood Database

    thumbnail of USGS NWIS peak streamflow website

    USGS Peak Streamflow Data

    The National Water Information System (NWIS) is the USGS water data portal where you can find a wealth of historic and real-time data related to floods. Click the image at left or the title above to go to the NWIS website where you can query for peak streamflow data by station, State, or region. Or, click here to go to the main NWIS page for a broader range of data.

    thumbnail of USGS Indirect Measurement website

    Indirect Measurement Guidelines

    A one-stop shop to learn about USGS policies and methods for making indirect measurements of past flood events.

    thumbnail of USGS flood anatomy video

    Video: The Anatomy of Floods

    Dr. Robert Holmes discusses causes and effects of flooding, including a look at aspects of the 2011 epic flooding, and how USGS science assists in the overall flood mitigation efforts of the United States.

  • thumbnail of example USGS reports

    USGS Flood Reports

    This website aggregates links to selected USGS reports which focus on floods and flood-related research.

    thumbnail linked to flood inundation mapper

    USGS Flood Inundation Mapping Program

    The USGS Flood Inundation Mapping Program (FIM) partners with local communities and other government agencies to develop and validate flood inundation map libraries. Click the title above to visit the USGS FIM website and learn more about available tools. Completed projects are collected on the USGS National Flood Inundation Mapper, brought to you by the USGS Wisconsin Internet Mapping Group (WiM). Click the image on the left to go straight to the Mapper.

    thumbnail of USGS Flood Event Viewer

    USGS Flood Event Viewer

    The USGS operates an event-based mobile storm-surge sensor network to capture information about coastal and inland storm tides. Click the title above to learn more about the USGS Short-Term Network, or click the image at left to go straight to the USGS Flood Event Viewer.

    Internal USGS users can login to the Short-Term Network application here.

    thumbnail of USGS PeakFQ program

    USGS At-Site Peak Flood Frequency Computation Program (PeakFQ)

    PeakFQ implements both the Bulletin 17B and Expected Moments Algorithm (EMA) procedures for flood-frequency analysis of peak streamflow records, providing estimates of flood magnitudes and their corresponding variance for a range of 15 annual exceedance probabilities. PeakFQ reads annual peaks in the standard peakfq (WATSTORE) text format available from NWISWeb

    thumbnail of USGS SWSTAT program

    USGS Surface Water Statistics Program (SWSTAT)

    The USGS SWSTAT program contains a number of options for statistically analyzing time-series data. Output options include minimum, maximum, mean, and standard deviation of a time-series, as well as flow-duration analyses, log-Pearson Type III frequency analyses, trends, and others using standard textbook procedures. Click the title above or the image at left to go to the SWSTAT website.

    thumbnail of USGS Indirect Measurement website

    Indirect Measurement Guidelines

    A one-stop shop to learn about USGS policies and methods for making indirect measurements of past flood events.

  • thumbnail linked to FloodWatch

    Flood Watch

    The USGS FloodWatch website is a map-based resource from USGS WaterWatch that gives users hourly visual updates for flood conditions at over 3000 locations across the United States. Click the map on the left to interact with the map or click here to learn how to use this map.

    thumbnail of example USGS reports

    USGS Flood Reports

    This website aggregates links to selected USGS reports which focus on floods and flood-related research.

    thumbnail linked to flood inundation mapper

    USGS Flood Inundation Mapping Program

    The USGS Flood Inundation Mapping Program (FIM) partners with local communities and other government agencies to develop and validate flood inundation map libraries. Click the title above to visit the USGS FIM website and learn more about available tools. Completed projects are collected on the USGS National Flood Inundation Mapper, brought to you by the USGS Wisconsin Internet Mapping Group (WiM). Click the image on the left to go straight to the Mapper.

    thumbnail of USGS Flood Event Viewer

    USGS Flood Event Viewer

    The USGS operates an event-based mobile storm-surge sensor network to capture information about coastal and inland storm tides. Click the title above to learn more about the USGS Short-Term Network, or click the image at left to go straight to the USGS Flood Event Viewer.

    Internal USGS users can login to the Short-Term Network application here.

    thumbnail of USGS Water Science School website

    USGS Water Science School

    The USGS Water Science School offers comprehensive, down-to-earth information on many aspects of water, along with pictures, data, maps, and an interactive center where you can give opinions and test your water knowledge

    thumbnail of USGS CO flood database map

    Interactive Historic Flood Maps

    Learn about past flooding through State-based USGS flood databases. Use one of the links below to access available databases.
    Colorado Flood Database
    Oklahoma Flood Database

    thumbnail of USGS PeakFQ program

    USGS At-Site Peak Flood Frequency Computation Program (PeakFQ)

    PeakFQ implements both the Bulletin 17B and Expected Moments Algorithm (EMA) procedures for flood-frequency analysis of peak streamflow records, providing estimates of flood magnitudes and their corresponding variance for a range of 15 annual exceedance probabilities. PeakFQ reads annual peaks in the standard peakfq (WATSTORE) text format available from NWISWeb

    thumbnail of USGS NSS program

    USGS National StreamFlow Statistics Program (NSS)

    USGS researchers across the nation have developed equations for estimating flood streamflows as well as other statistics at ungaged sites. These equations are collected for easy access and computation through the downloadable NSS program and the associated NSS/StreamStats database. Users can download the NSS program and database from the NSS website linked here. Users will also find reports detailing the development and proper use of every equation in the NSS/StreamStats database.

    thumbnail of USGS StreamStats website

    StreamStats

    The USGS StreamStats website is a GIS-based web tool for estimating streamflows at gaged and ungaged locations. Features similar to the NSS program are presented to users with no programs to install. Users can visit the StreamStats website linked here and click on a stream location on the interactive map to compute estimated streamflows for floods and other statistics. Additional statistics at gaged locations are also presented.

    thumbnail of USGS SWSTAT program

    USGS Surface Water Statistics Program (SWSTAT)

    The USGS SWSTAT program contains a number of options for statistically analyzing time-series data. Output options include minimum, maximum, mean, and standard deviation of a time-series, as well as flow-duration analyses, log-Pearson Type III frequency analyses, trends, and others using standard textbook procedures. Click the title above or the image at left to go to the SWSTAT website.

    thumbnail of USGS NWIS peak streamflow website

    USGS Peak Streamflow Data

    The National Water Information System (NWIS) is the USGS water data portal where you can find a wealth of historic and real-time data related to floods. Click the image at left or the title above to go to the NWIS website where you can query for peak streamflow data by station, State, or region. Or, click here to go to the main NWIS page for a broader range of data.

    thumbnail of USGS WaterAlert website

    USGS WaterAlert

    Select your favorite USGS streamgage from the USGS WaterAlert map, then set water stage or streamflow thresholds to receive instant notifications sent to your email address or mobile device. Click the image at left or the title above to go to the map and select your site(s).

    thumbnail of USGS WaterNow website

    USGS WaterNow text service

    Want to know what's happening right now? Request real-time information from any USGS streamgage with the USGS WaterNow text service. This service responds to your text message with information about the current stage, streamflow, or other parameters collected at the gage. Click the image at left or the title above to learn how.

    thumbnail of USGS Streamer website

    Streamer

    The USGS Streamer is a super-friendly interactive map that helps you explore America's larger streams by tracing upstream to their sources or downstream to where they empty. The map includes layers for weather radar and near-real-time streamflow conditions.

    thumbnail of USGS Indirect Measurement website

    Indirect Measurement Guidelines

    A one-stop shop to learn about USGS policies and methods for making indirect measurements of past flood events.

    thumbnail of USGS 100-yr-flood poster

    Poster: 100-Year Flood--It's All About Chance

    How can a 100-year flood strike twice in 15 years? This is a downloadable poster discussing the meaning and use of probability language in flood characterization.

    thumbnail of USGS flood anatomy video

    Video: The Anatomy of Floods

    Dr. Robert Holmes discusses causes and effects of flooding, including a look at aspects of the 2011 epic flooding, and how USGS science assists in the overall flood mitigation efforts of the United States.

    thumbnail of USGS emergency management link

    USGS Emergency Management Website

    The USGS Natural Hazards Mission Area has been given responsibility for overseeing the bureau's emergency management activities. This function includes the USGS Hazard Response Executive Committee, which provides executive direction, oversight, and support to USGS managers in responding to major hazard events. During incidents of national significance, the USGS provides support to certain National Response Framework emergency support functions.

    thumbnail of USGS storm tide gage

    USGS Surge, Wave, and Tide Hydrodynamics (SWATH) Network

    SWaTH is a system of flood-hardened, real-time telemetered tide gages, rapid deployment gages, and storm tide sensors deployed in integrated network configurations along the Northeastern Atlantic Coast from North Carolina to Maine.

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