View current flooding conditions
Access streamflow, precipitation, rate of change, NWS weather and flood stage, and more in the new National Water Dashboard
Flood Event Viewer
Access information and data associated with short-term, storm-event-based collection efforts
Visualize flooding
Interactive data visualizations for flooding related to hurricanes and flood events, quarterly streamflow summaries, and more
The USGS collects flood data and conducts targeted flood science to help Federal, State, and local agencies, decision makers, and the public before, during, and after a flood. Our efforts provide situational awareness, drive predictive models, inform infrastructure design and operation, undergird floodplain mapping, assist flood constituent/load quantification, and facilitate flood impact assessments.
Use this website to discover real-time and historic flood data and scientific investigations, and learn how we collect data while addressing logistical and technical challenges.
USGS Flood Current Conditions and Notifications
The USGS offers multiple products that allow our stakeholders and the public to be notified of high-flow conditions and USGS flood response activities:
- National Water Dashboard: Access current flood and high-flow conditions, along with other streamflow information
- Regional and Local Flood Alerts: View current and historical alerts of flooding and response activities; subscribe to RSS feeds
- WaterAlert: The WaterAlert service provides notifications to your email or phone for changes in water conditions based on thresholds you choose.
Other USGS Flood Resources
Flood Resources from our Partners
National Weather Service River Observations and Forecast
National Weather Service Riverwatch: Mississippi River Basin Forecasts
Below are other science projects associated with USGS flood information and activities.
Water Data Visualizations
Rapid Deployment Gages (RDGs)
StreamStats
Surge, Wave, and Tide Hydrodynamics (SWaTH) Network
Providing Major Storm and Short-Term Flood Event Data
Historical Flooding
Flood Inundation Mapping (FIM) Program
Flood Event Viewer: Hurricane Ian data collection near Fort Myers, Florida
Flood Event Viewer: Hurricane Ian data collection near Fort Myers, FloridaDuring major storms or other short-term events, the USGS collects streamflow and additional data (including storm tide, wave height, high-water marks, and additional sensor deployments) to aid in documenting flood events.
Flood Event Viewer: Hurricane Ian data collection near Fort Myers, Florida
Flood Event Viewer: Hurricane Ian data collection near Fort Myers, FloridaDuring major storms or other short-term events, the USGS collects streamflow and additional data (including storm tide, wave height, high-water marks, and additional sensor deployments) to aid in documenting flood events.
Screen capture displaying areas of inundation within the City of Elizabeth for a flood event generated from a Flood Inundation Mapper.
Screen capture displaying areas of inundation within the City of Elizabeth for a flood event generated from a Flood Inundation Mapper.
Real-Time Flood Impact Map: flooded road impact location in St. Paul, MN
Real-Time Flood Impact Map: flooded road impact location in St. Paul, MNClicking on a flood feature icon in the USGS Real-Time Flood Impact Map will display information about that Flood Impact Location, the current conditions at the nearby USGS streamgage, and the USGS HIVIS webcam image (if available). For example, this Flood Impact Location in St.
Real-Time Flood Impact Map: flooded road impact location in St. Paul, MN
Real-Time Flood Impact Map: flooded road impact location in St. Paul, MNClicking on a flood feature icon in the USGS Real-Time Flood Impact Map will display information about that Flood Impact Location, the current conditions at the nearby USGS streamgage, and the USGS HIVIS webcam image (if available). For example, this Flood Impact Location in St.
Westernport, Maryland was one of the hardest hit towns during the mid-May flooding in Western Maryland, where Georges Creek flooded an elementary school in Westernport, MD, prompting the emergency rescue of schoolchildren.
Westernport, Maryland was one of the hardest hit towns during the mid-May flooding in Western Maryland, where Georges Creek flooded an elementary school in Westernport, MD, prompting the emergency rescue of schoolchildren.
Real-Time Flood Impact Map: active flood impact locations during April 2025 flooding near Indianapolis, IN
Real-Time Flood Impact Map: active flood impact locations during April 2025 flooding near Indianapolis, INScreenshot of the USGS Real-Time Flood Impact Map on April 9, 2025, near Indianapolis, IN. Multiple streams and rivers experienced spring flooding, overtopping their embankments and affecting nearby roads, buildings, bridges, and more.
Real-Time Flood Impact Map: active flood impact locations during April 2025 flooding near Indianapolis, IN
Real-Time Flood Impact Map: active flood impact locations during April 2025 flooding near Indianapolis, INScreenshot of the USGS Real-Time Flood Impact Map on April 9, 2025, near Indianapolis, IN. Multiple streams and rivers experienced spring flooding, overtopping their embankments and affecting nearby roads, buildings, bridges, and more.
Kennebec River in downtown Augusta, Maine during flooding and normal flow
Kennebec River in downtown Augusta, Maine during flooding and normal flowKennebec River in downtown Augusta, Maine during flooding and normal flow. The left photo was taken on December 19, 2023 after a heavy rainstorm. The right photo was taken in September 2024.
Kennebec River in downtown Augusta, Maine during flooding and normal flow
Kennebec River in downtown Augusta, Maine during flooding and normal flowKennebec River in downtown Augusta, Maine during flooding and normal flow. The left photo was taken on December 19, 2023 after a heavy rainstorm. The right photo was taken in September 2024.
A cross-sectional view of a hypothetical river showing one possible arrangement of the three Federal Flood Risk Management Standard (FFRMS) floodplain elevations (Climate-Informed Science Approach, the Freeboard Value Approach, and the 0.2% Annual-Chance Flood Approach) above the current Base Flood Elevation, i.e., the 1% annual-chance flood elevation.
A cross-sectional view of a hypothetical river showing one possible arrangement of the three Federal Flood Risk Management Standard (FFRMS) floodplain elevations (Climate-Informed Science Approach, the Freeboard Value Approach, and the 0.2% Annual-Chance Flood Approach) above the current Base Flood Elevation, i.e., the 1% annual-chance flood elevation.
A cross-sectional view of a hypothetical coastline showing one possible arrangement of the three Federal Flood Risk Management Standard (FFRMS) floodplain elevations (Climate-Informed Science Approach, the Freeboard Value Approach, and the 0.2% Annual-Chance Flood Approach) above the current Base Flood Elevation, i.e., the 1% annual-chance flood elevation.
A cross-sectional view of a hypothetical coastline showing one possible arrangement of the three Federal Flood Risk Management Standard (FFRMS) floodplain elevations (Climate-Informed Science Approach, the Freeboard Value Approach, and the 0.2% Annual-Chance Flood Approach) above the current Base Flood Elevation, i.e., the 1% annual-chance flood elevation.
Measuring a High-Water Mark at the Androscoggin River in Topsham, Maine
Measuring a High-Water Mark at the Androscoggin River in Topsham, MaineA hydrologic technician measures a high-water mark near the Androscoggin River in Topsham, Maine days after a significant flood event in late December 2023. A combination of heavy rainfall and snowmelt prompted the flooding.
Measuring a High-Water Mark at the Androscoggin River in Topsham, Maine
Measuring a High-Water Mark at the Androscoggin River in Topsham, MaineA hydrologic technician measures a high-water mark near the Androscoggin River in Topsham, Maine days after a significant flood event in late December 2023. A combination of heavy rainfall and snowmelt prompted the flooding.
Flooding on Kennebec River at Calumet Bridge in Augusta, Maine
Flooding on Kennebec River at Calumet Bridge in Augusta, MaineThis USGS webcam footage shows the Kennebec River in Augusta, Maine, flooding after a large coastal storm hit much of the East Coast and battered New England with heavy rains and winds. USGS image.
Flooding on Kennebec River at Calumet Bridge in Augusta, Maine
Flooding on Kennebec River at Calumet Bridge in Augusta, MaineThis USGS webcam footage shows the Kennebec River in Augusta, Maine, flooding after a large coastal storm hit much of the East Coast and battered New England with heavy rains and winds. USGS image.
A high-water mark tag nailed to a tree trunk with visible debris. The debris that adheres to the tree is the physical evidence of how high the flood waters rose during the flood event; when the waters recede, the debris transported by the flood waters that was floating on the top of the water sticks to the tree.
A high-water mark tag nailed to a tree trunk with visible debris. The debris that adheres to the tree is the physical evidence of how high the flood waters rose during the flood event; when the waters recede, the debris transported by the flood waters that was floating on the top of the water sticks to the tree.
It’s an age-old question: If the river floods and no one sees it, did it flood? Yes! High water events leave behind clues such as debris that USGS scientists can observe to indirectly estimate the water level and streamflow during the event.
It’s an age-old question: If the river floods and no one sees it, did it flood? Yes! High water events leave behind clues such as debris that USGS scientists can observe to indirectly estimate the water level and streamflow during the event.
Section of Fort Myers Beach before and after Hurricane Ian
Section of Fort Myers Beach before and after Hurricane IanSection of Fort Myers Beach, Florida, before and after Hurricane Ian, 2022. The area endured severe damage and coastal change from the storm including overwashed sand, coastal flooding, and in some places, erosion.
Section of Fort Myers Beach before and after Hurricane Ian
Section of Fort Myers Beach before and after Hurricane IanSection of Fort Myers Beach, Florida, before and after Hurricane Ian, 2022. The area endured severe damage and coastal change from the storm including overwashed sand, coastal flooding, and in some places, erosion.
Landsat images from March of 2018 and March of 2019 show a stretch of the Missouri, Platte, and Elkhorn rivers in a full scene that stretches from just north of Sioux City, IA, to south of Omaha, NE. The first image shows the rivers at normal levels.
Landsat images from March of 2018 and March of 2019 show a stretch of the Missouri, Platte, and Elkhorn rivers in a full scene that stretches from just north of Sioux City, IA, to south of Omaha, NE. The first image shows the rivers at normal levels.
Hurricane Harvey flooding at Addicks Reservoir, Houston TX
Hurricane Harvey flooding at Addicks Reservoir, Houston TXAddicks Reservoir, Houston TX. Before image (8/29/2017) shows Hurricane Harvey flooding. Reservoir level was 108.8 feet at the time of the picture; the peak was 109.09 feet on 8/30. After image (4/6/2018) is eight months after the flooding; reservoir level was 69.45 ft.
Hurricane Harvey flooding at Addicks Reservoir, Houston TX
Hurricane Harvey flooding at Addicks Reservoir, Houston TXAddicks Reservoir, Houston TX. Before image (8/29/2017) shows Hurricane Harvey flooding. Reservoir level was 108.8 feet at the time of the picture; the peak was 109.09 feet on 8/30. After image (4/6/2018) is eight months after the flooding; reservoir level was 69.45 ft.
Hurricane Ida made landfall as a Category 4 hurricane in Louisiana, and brought widespread precipitation and flooding along its path and up the northeastern coast of U.S. in the following week.
Hurricane Ida made landfall as a Category 4 hurricane in Louisiana, and brought widespread precipitation and flooding along its path and up the northeastern coast of U.S. in the following week.
100-Year Flood - It's All About Chance poster image
100-Year Flood - It's All About Chance poster image
USGS measures spring flooding at Chesapeake bay's largest tributary
USGS measures spring flooding at Chesapeake bay's largest tributaryA USGS field team, to include Pat Bowen, Kate Bowen and John Trainor, uses specialized equipment to measure spring floodwaters at Chesapeake Bay's largest tributary, the Susquehanna River in Maryland.
USGS measures spring flooding at Chesapeake bay's largest tributary
USGS measures spring flooding at Chesapeake bay's largest tributaryA USGS field team, to include Pat Bowen, Kate Bowen and John Trainor, uses specialized equipment to measure spring floodwaters at Chesapeake Bay's largest tributary, the Susquehanna River in Maryland.
USGS hydrographer makes a flood measurement in Tusten, NY
USGS hydrographer makes a flood measurement in Tusten, NYUSGS hydrographer Dave Thompson makes a near-peak flood measurement off a bridge at Tenmile River in Tusten, New York.
USGS hydrographer makes a flood measurement in Tusten, NY
USGS hydrographer makes a flood measurement in Tusten, NYUSGS hydrographer Dave Thompson makes a near-peak flood measurement off a bridge at Tenmile River in Tusten, New York.
USGS hydrographer Brent Hanson wades out in freezing waters to collect flood measurements on the Sheyenne River near Cooperstown, North Dakota. Hanson reads an outside staff, which is a vertical graduated ruler used to calibrate the continuous readings of water level provided by electronic sensors.
USGS hydrographer Brent Hanson wades out in freezing waters to collect flood measurements on the Sheyenne River near Cooperstown, North Dakota. Hanson reads an outside staff, which is a vertical graduated ruler used to calibrate the continuous readings of water level provided by electronic sensors.
The USGS collects flood data and conducts targeted flood science to help Federal, State, and local agencies, decision makers, and the public before, during, and after a flood. Our efforts provide situational awareness, drive predictive models, inform infrastructure design and operation, undergird floodplain mapping, assist flood constituent/load quantification, and facilitate flood impact assessments.
Use this website to discover real-time and historic flood data and scientific investigations, and learn how we collect data while addressing logistical and technical challenges.
USGS Flood Current Conditions and Notifications
The USGS offers multiple products that allow our stakeholders and the public to be notified of high-flow conditions and USGS flood response activities:
- National Water Dashboard: Access current flood and high-flow conditions, along with other streamflow information
- Regional and Local Flood Alerts: View current and historical alerts of flooding and response activities; subscribe to RSS feeds
- WaterAlert: The WaterAlert service provides notifications to your email or phone for changes in water conditions based on thresholds you choose.
Other USGS Flood Resources
Flood Resources from our Partners
National Weather Service River Observations and Forecast
National Weather Service Riverwatch: Mississippi River Basin Forecasts
Below are other science projects associated with USGS flood information and activities.
Water Data Visualizations
Rapid Deployment Gages (RDGs)
StreamStats
Surge, Wave, and Tide Hydrodynamics (SWaTH) Network
Providing Major Storm and Short-Term Flood Event Data
Historical Flooding
Flood Inundation Mapping (FIM) Program
Flood Event Viewer: Hurricane Ian data collection near Fort Myers, Florida
Flood Event Viewer: Hurricane Ian data collection near Fort Myers, FloridaDuring major storms or other short-term events, the USGS collects streamflow and additional data (including storm tide, wave height, high-water marks, and additional sensor deployments) to aid in documenting flood events.
Flood Event Viewer: Hurricane Ian data collection near Fort Myers, Florida
Flood Event Viewer: Hurricane Ian data collection near Fort Myers, FloridaDuring major storms or other short-term events, the USGS collects streamflow and additional data (including storm tide, wave height, high-water marks, and additional sensor deployments) to aid in documenting flood events.
Screen capture displaying areas of inundation within the City of Elizabeth for a flood event generated from a Flood Inundation Mapper.
Screen capture displaying areas of inundation within the City of Elizabeth for a flood event generated from a Flood Inundation Mapper.
Real-Time Flood Impact Map: flooded road impact location in St. Paul, MN
Real-Time Flood Impact Map: flooded road impact location in St. Paul, MNClicking on a flood feature icon in the USGS Real-Time Flood Impact Map will display information about that Flood Impact Location, the current conditions at the nearby USGS streamgage, and the USGS HIVIS webcam image (if available). For example, this Flood Impact Location in St.
Real-Time Flood Impact Map: flooded road impact location in St. Paul, MN
Real-Time Flood Impact Map: flooded road impact location in St. Paul, MNClicking on a flood feature icon in the USGS Real-Time Flood Impact Map will display information about that Flood Impact Location, the current conditions at the nearby USGS streamgage, and the USGS HIVIS webcam image (if available). For example, this Flood Impact Location in St.
Westernport, Maryland was one of the hardest hit towns during the mid-May flooding in Western Maryland, where Georges Creek flooded an elementary school in Westernport, MD, prompting the emergency rescue of schoolchildren.
Westernport, Maryland was one of the hardest hit towns during the mid-May flooding in Western Maryland, where Georges Creek flooded an elementary school in Westernport, MD, prompting the emergency rescue of schoolchildren.
Real-Time Flood Impact Map: active flood impact locations during April 2025 flooding near Indianapolis, IN
Real-Time Flood Impact Map: active flood impact locations during April 2025 flooding near Indianapolis, INScreenshot of the USGS Real-Time Flood Impact Map on April 9, 2025, near Indianapolis, IN. Multiple streams and rivers experienced spring flooding, overtopping their embankments and affecting nearby roads, buildings, bridges, and more.
Real-Time Flood Impact Map: active flood impact locations during April 2025 flooding near Indianapolis, IN
Real-Time Flood Impact Map: active flood impact locations during April 2025 flooding near Indianapolis, INScreenshot of the USGS Real-Time Flood Impact Map on April 9, 2025, near Indianapolis, IN. Multiple streams and rivers experienced spring flooding, overtopping their embankments and affecting nearby roads, buildings, bridges, and more.
Kennebec River in downtown Augusta, Maine during flooding and normal flow
Kennebec River in downtown Augusta, Maine during flooding and normal flowKennebec River in downtown Augusta, Maine during flooding and normal flow. The left photo was taken on December 19, 2023 after a heavy rainstorm. The right photo was taken in September 2024.
Kennebec River in downtown Augusta, Maine during flooding and normal flow
Kennebec River in downtown Augusta, Maine during flooding and normal flowKennebec River in downtown Augusta, Maine during flooding and normal flow. The left photo was taken on December 19, 2023 after a heavy rainstorm. The right photo was taken in September 2024.
A cross-sectional view of a hypothetical river showing one possible arrangement of the three Federal Flood Risk Management Standard (FFRMS) floodplain elevations (Climate-Informed Science Approach, the Freeboard Value Approach, and the 0.2% Annual-Chance Flood Approach) above the current Base Flood Elevation, i.e., the 1% annual-chance flood elevation.
A cross-sectional view of a hypothetical river showing one possible arrangement of the three Federal Flood Risk Management Standard (FFRMS) floodplain elevations (Climate-Informed Science Approach, the Freeboard Value Approach, and the 0.2% Annual-Chance Flood Approach) above the current Base Flood Elevation, i.e., the 1% annual-chance flood elevation.
A cross-sectional view of a hypothetical coastline showing one possible arrangement of the three Federal Flood Risk Management Standard (FFRMS) floodplain elevations (Climate-Informed Science Approach, the Freeboard Value Approach, and the 0.2% Annual-Chance Flood Approach) above the current Base Flood Elevation, i.e., the 1% annual-chance flood elevation.
A cross-sectional view of a hypothetical coastline showing one possible arrangement of the three Federal Flood Risk Management Standard (FFRMS) floodplain elevations (Climate-Informed Science Approach, the Freeboard Value Approach, and the 0.2% Annual-Chance Flood Approach) above the current Base Flood Elevation, i.e., the 1% annual-chance flood elevation.
Measuring a High-Water Mark at the Androscoggin River in Topsham, Maine
Measuring a High-Water Mark at the Androscoggin River in Topsham, MaineA hydrologic technician measures a high-water mark near the Androscoggin River in Topsham, Maine days after a significant flood event in late December 2023. A combination of heavy rainfall and snowmelt prompted the flooding.
Measuring a High-Water Mark at the Androscoggin River in Topsham, Maine
Measuring a High-Water Mark at the Androscoggin River in Topsham, MaineA hydrologic technician measures a high-water mark near the Androscoggin River in Topsham, Maine days after a significant flood event in late December 2023. A combination of heavy rainfall and snowmelt prompted the flooding.
Flooding on Kennebec River at Calumet Bridge in Augusta, Maine
Flooding on Kennebec River at Calumet Bridge in Augusta, MaineThis USGS webcam footage shows the Kennebec River in Augusta, Maine, flooding after a large coastal storm hit much of the East Coast and battered New England with heavy rains and winds. USGS image.
Flooding on Kennebec River at Calumet Bridge in Augusta, Maine
Flooding on Kennebec River at Calumet Bridge in Augusta, MaineThis USGS webcam footage shows the Kennebec River in Augusta, Maine, flooding after a large coastal storm hit much of the East Coast and battered New England with heavy rains and winds. USGS image.
A high-water mark tag nailed to a tree trunk with visible debris. The debris that adheres to the tree is the physical evidence of how high the flood waters rose during the flood event; when the waters recede, the debris transported by the flood waters that was floating on the top of the water sticks to the tree.
A high-water mark tag nailed to a tree trunk with visible debris. The debris that adheres to the tree is the physical evidence of how high the flood waters rose during the flood event; when the waters recede, the debris transported by the flood waters that was floating on the top of the water sticks to the tree.
It’s an age-old question: If the river floods and no one sees it, did it flood? Yes! High water events leave behind clues such as debris that USGS scientists can observe to indirectly estimate the water level and streamflow during the event.
It’s an age-old question: If the river floods and no one sees it, did it flood? Yes! High water events leave behind clues such as debris that USGS scientists can observe to indirectly estimate the water level and streamflow during the event.
Section of Fort Myers Beach before and after Hurricane Ian
Section of Fort Myers Beach before and after Hurricane IanSection of Fort Myers Beach, Florida, before and after Hurricane Ian, 2022. The area endured severe damage and coastal change from the storm including overwashed sand, coastal flooding, and in some places, erosion.
Section of Fort Myers Beach before and after Hurricane Ian
Section of Fort Myers Beach before and after Hurricane IanSection of Fort Myers Beach, Florida, before and after Hurricane Ian, 2022. The area endured severe damage and coastal change from the storm including overwashed sand, coastal flooding, and in some places, erosion.
Landsat images from March of 2018 and March of 2019 show a stretch of the Missouri, Platte, and Elkhorn rivers in a full scene that stretches from just north of Sioux City, IA, to south of Omaha, NE. The first image shows the rivers at normal levels.
Landsat images from March of 2018 and March of 2019 show a stretch of the Missouri, Platte, and Elkhorn rivers in a full scene that stretches from just north of Sioux City, IA, to south of Omaha, NE. The first image shows the rivers at normal levels.
Hurricane Harvey flooding at Addicks Reservoir, Houston TX
Hurricane Harvey flooding at Addicks Reservoir, Houston TXAddicks Reservoir, Houston TX. Before image (8/29/2017) shows Hurricane Harvey flooding. Reservoir level was 108.8 feet at the time of the picture; the peak was 109.09 feet on 8/30. After image (4/6/2018) is eight months after the flooding; reservoir level was 69.45 ft.
Hurricane Harvey flooding at Addicks Reservoir, Houston TX
Hurricane Harvey flooding at Addicks Reservoir, Houston TXAddicks Reservoir, Houston TX. Before image (8/29/2017) shows Hurricane Harvey flooding. Reservoir level was 108.8 feet at the time of the picture; the peak was 109.09 feet on 8/30. After image (4/6/2018) is eight months after the flooding; reservoir level was 69.45 ft.
Hurricane Ida made landfall as a Category 4 hurricane in Louisiana, and brought widespread precipitation and flooding along its path and up the northeastern coast of U.S. in the following week.
Hurricane Ida made landfall as a Category 4 hurricane in Louisiana, and brought widespread precipitation and flooding along its path and up the northeastern coast of U.S. in the following week.
100-Year Flood - It's All About Chance poster image
100-Year Flood - It's All About Chance poster image
USGS measures spring flooding at Chesapeake bay's largest tributary
USGS measures spring flooding at Chesapeake bay's largest tributaryA USGS field team, to include Pat Bowen, Kate Bowen and John Trainor, uses specialized equipment to measure spring floodwaters at Chesapeake Bay's largest tributary, the Susquehanna River in Maryland.
USGS measures spring flooding at Chesapeake bay's largest tributary
USGS measures spring flooding at Chesapeake bay's largest tributaryA USGS field team, to include Pat Bowen, Kate Bowen and John Trainor, uses specialized equipment to measure spring floodwaters at Chesapeake Bay's largest tributary, the Susquehanna River in Maryland.
USGS hydrographer makes a flood measurement in Tusten, NY
USGS hydrographer makes a flood measurement in Tusten, NYUSGS hydrographer Dave Thompson makes a near-peak flood measurement off a bridge at Tenmile River in Tusten, New York.
USGS hydrographer makes a flood measurement in Tusten, NY
USGS hydrographer makes a flood measurement in Tusten, NYUSGS hydrographer Dave Thompson makes a near-peak flood measurement off a bridge at Tenmile River in Tusten, New York.
USGS hydrographer Brent Hanson wades out in freezing waters to collect flood measurements on the Sheyenne River near Cooperstown, North Dakota. Hanson reads an outside staff, which is a vertical graduated ruler used to calibrate the continuous readings of water level provided by electronic sensors.
USGS hydrographer Brent Hanson wades out in freezing waters to collect flood measurements on the Sheyenne River near Cooperstown, North Dakota. Hanson reads an outside staff, which is a vertical graduated ruler used to calibrate the continuous readings of water level provided by electronic sensors.