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Experimental National Water Center Products: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit https://www.weather.gov/owp/operations for more information. The National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via the URL above, as described in the StoryMap here.

Weather Forecast Office Peachtree City/Atlanta, GA

Southeast River Forecast Center

Hydrograph

River at a Glance

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Printable Image About this graph Tabular Data (UTC) Tabular Data (EST) Datum: NAVD88 Metadata

NOTE: Automated gauge readings are now available, courtesy of the USGS. NOTE: Forecasts are not available for the Oostanaula River at Calhoun. Only observed stages are available for this point.

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Upstream Gauge

Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 35 Moderate Flood Stage: 30 Flood Stage: 21 Action Stage: 18 Low Stage (in feet): -9999 Historic Crests (1) 34.15 ft on 02/19/1990 (2) 29.97 ft on 12/28/2015 (3) 29.71 ft on 03/24/1980 (4) 29.10 ft on 01/06/1982 (5) 28.12 ft on 03/28/2021 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 22.50 ft on 02/06/2022 (2) 21.68 ft on 09/04/2021 (3) 28.12 ft on 03/28/2021 (4) 21.26 ft on 03/21/2021 (5) 24.43 ft on 04/16/2020 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records (1) 1.92 ft on 10/08/2007 (2) 1.96 ft on 09/26/2007 For more information on your flood risk go to www.floodsmart.gov. Show FEMA's National Flood Hazard Layers FEMA's National Flood Hazard Layers not showing? Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map? Possible reasons: There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. The FEMA Web Mapping Service (WMS) is down. Note: Your zoom level may have changed. ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers.

Zoom Level:16 Legend FEMA Layer Gauge Location Disclaimer Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.

Flood Impacts & Photos

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37	Near record flooding occurs with widespread innundation flooding in the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. Flood waters up to 8 feet deep will be affecting the athletic fields at the Harris River Park on Mauldin Road and additional athletic fields near the boat ramp off the Georgia Highway 136 Connector. The water level will reach the bottom of the North River Street bridge and begin to flood portions of the road.
35	Major flooding begins. Widespread innundation flooding occurs in the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. Flood waters up to 6 feet deep will be affecting the athletic fields at the Harris River Park on Mauldin Road and additional athletic fields near the boat ramp off the Georgia Highway 136 Connector. The water level will be approaching the foundation of a textile mill in Calhoun.
34	Significant flooding continues to expand further into the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. A boat ramp and small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under at least 13 feet of water. Flood waters up to 4 feet deep will be affecting the athletic fields at the Harris River Park on Mauldin Road and additional athletic fields near the boat ramp.
32	Significant flooding continues to expand into the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. A boat ramp and small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under at least 11 feet of water. Flood waters up to two feet deep will be affecting the athletic fields at the Harris River Park on Mauldin Road and additional athletic fields near the boat ramp.
30	Moderate flooding beings. Significant flooding expands into the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. A boat ramp and small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under at least 9 feet of water. Flood waters will be approaching athletic fields at the Harris River Park on Mauldin Road and additional athletic fields near the boat ramp.
29	Minor flooding continues to expand much further into the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. A boat ramp and small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under at least 8 feet of water. Flood water will begin to fill in low areas near athletic fields at the Harris River Park on Mauldin Road.
27	Minor flooding continues to expand further into the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. A boat ramp and small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under at least 6 feet of water.
25	Minor flooding continues to expand into the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. A boat ramp and small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under at least 4 feet of water.
23	Minor flooding continues to expand into the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. A boat ramp and small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under at least 2 feet of water.
21	Minor flooding begins of woodlands...fields and pastures upstream and downstream from the gage behind a water treatment plant off Mauldin Road. A boat ramp and portions of a small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under water.
18	Bankfull is reached upstream and downstream from the river gauge behind the water treatment plant off Mauldin Road. The water level reaches the top of the boat ramp just upstream from the Georgia Highway 136 Connector or North River Street bridge.

About This Location

Latitude: 34.518889° N, Longitude: 84.954444° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 21 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps Vertical Datum Elevation (gauge height = 0) Elevation (gauge height = flood stage) Elevation information source NAVD88 595.5 ft 616.5 ft Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks Other Not Available Not Available   Current/Historical Observations: U.S. Geological Survey (USGS) Data and Site Info for Calhoun

Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary Inundation Mapping Locations Spring Flood Outlook USGS Georgia

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management WFO FFC Additional Links Google Earth Gage Locations Snow Information

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