The water features displayed draw from the Hydro Reference Overlay cached map service, built at scales ranging from 147M to 18k based on mean annual flow values from the NHDPlus program.
NOAA's National Weather Service - Advanced Hydrologic Prediction Service (AHPS) provides a river observation and forecast map service that contains the water height at gauges in streams. Observed stream level data are updated every 15 minutes and forecasts are generated using a sophisticated hydrologic model. Based on historical records and the prediction models, the current water levels are categorized in five classes, ranging from normal to various flood alert levels:
Action Stage- or near flood stage. At this level, the water surface is generally over the top of its banks, but no man-made structures are flooded
MinorFlood Stage. At this level few buildings are expected to be inundated, but roads may be covered with water, parklands and yards may be inundated and water may go under buildings on stilts.
Moderate Flood Stage. Inundation of buildings begins at this stage. Roads are likely to be closed and some areas cut off. Some evacuations may be necessary.
Major Flood Stage. Significant to catastrophic, life-threatening flooding is expected at this stage. Extensive flooding with some low-lying areas completely inundated is likely. Structures may be completely submerged. Large-scale evacuations may be necessary.
In some situations, as the flood water rise, the contact with the measuring instruments is lost and the gauge is displayed as "old", meaning that no new information has been acquired in the past 24 hours.
The Flood Warning Areas are geographical representations of the National Weather Service (NWS) Alert System that issue warnings to facilitate emergency information sharing for NWS flood forecast zones for the emergency response and management community.
Map Functionality:
By clicking on one of the gauges, the current water level reading is graphically represented relative to the historic flood stages recorded at that location.
The "more" link on the graph, will provide the water level information for the past seven days, the current reading, as well as the water level forecast for the next five days.
By clicking on the highlighted counties, more information related to the NWS Flood Warning service is displayed, including the location and duration of the warning.
Credits:
This application was created by members of the esri Mapping Center Team. Any questions/comments can be
directed to any of the following creators.
Erika Boghici: eboghici@esri.com
Mark Cooney: mcooney@esri.com
Michael Dangermond: mdangermond@esri.com
Caitlin Scopel: cscopel@esri.com
The live data for this stream gauge is currently unavailable, please check back again later.
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Esri’s High Water Web Map is a public information viewer that reports current
water levels and flood forecasts for more than 4,000 gauges on streams and rivers across the US.
Data obtained every 15 minutes from NOAA’s National Weather Service – Advanced Hydrologic
Prediction Service categorize stream levels in five classes. These classes range from normal to
various alert levels: action stage (near flood stage), minor flood stage, moderate flood stage
and major flood stage. Flood forecasts are provided for the next five days.
Corresponding warnings issued by NOAA for counties impacted by floods are updated every 10 minutes.
Clicking points (stream gauges) will provide information for each gauge.