Rainfall and River Elevation Information

There are 6 Flood Warning Gauges and 15 United States Geological Service (USGS) gauges in the area. The Flood Warning gauges are operated by the USGS and the National Weather Service (NWS). Their web site is www.nws.noaa.gov. Warning and watch information is available on their web page and the link for Fulton County is http://www.weather.gov/alerts-beta/wwaatmget.php?x=GAC121. The information from all of the USGS gauges is reported real time and can be reached using the USGS web page http://ga.water.usgs.gov/. All of the USGS gauges report gauge height and most of them also tell the amount of precipitation. A table of the gauges is provided in Table 1. The gauge locations are shown on Figure 1.

Table 1 – Gauges in the area

USGS ID USGS Name NOAA Name Gauge height Discharge Precipitation
02335350 Crooked Creek nr Norcross   X X X
02335450 Chattahoochee River above Roswell Roswell X X  
02335700 Big Creek Nr. Alpharetta Alpharetta X X X
02335757 Big Creek below Hog Wallow Creek in Roswell Roswell X X  
02335790 Willeo Creek at Ga 120 nr Roswell   X X X
02335810 Chattahoochee River at Morgan Falls Dam   X   X
02335815 Chattahoochee River below Morgan Falls Dam Morgan Falls X X  
023358685 Sewell Mill Creek at Ga 120   X X X
02335870 Sope Creek nr Marietta Marietta X X X
02335910 Rottenwood Creek at Interstate N. Pky   X X X
02335990 Chattahoochee River at US Hwy 41   X   X
02336000 Chattahoochee River at Atlanta   X X  
02336030 North Fork Peachtree Creek at Graves Road   X X X
02336360 Nancy Creek at Rickenbacker Dr Buckhead X X X
02336410 Nancy Creek at West Wesley Road   X X  

Figure 1 – USGS Gauges and NOAA Gauges in the Sandy Springs area

NOAA Gauges

The NWS issues flood alerts based on elevations in the stream and the forecast of rain and stream response. These alerts give residents in low lying areas time to move furniture and other belongings up out of projected flood levels. During heavy rainfall, the NOAA forecasts look like Figure 2. Web Page URLs are given in Table 2 for all of the gauges.

Figure 2 – Example of Flood Warning gauge located just South of Sandy Springs on Nancy Creek.

USGS Gauges

All of the USGS gauges report gauge height and most of them also tell the amount of precipitation. Some gauges have additional information concerning water quality. Any gauge of interest can be saved as a favorite on a Web page and accessed directly without going thought the USGS home page. In addition, gauge height can be obtained using e-mail by e-mailing StreaMail@USGS.gov and putting the gauge number in the subject line.

An example of the flow data and precipitation data for the USGS data for the Nancy Creek Gauge near Rickerbacker, looks like Figure 3 and 4. Figure 4 shows that about 0.7 inches of rain was received on the day of June 15, 2010 at this location. Web Page URLs are given in Table 2 for all of the USGS gauges.

Figure 3 – Example of USGS Flow data at the Rickenbacker Gauge

Gauge Height, Feet - Most recent instantaneous value: 0.77 06-17-2010 10:15 EST

Figure 4 – Example of Precipitation data for the Rickerbacker Gauge:

Precipitation, total, inches - Most recent instantaneous value: 0.00 06-17-2010 10:15 EST

Table 2 – URLs for Gauges in Sandy Springs Area

USGS ID USGS Name USGS URL NOAA Name NOAA URL
02335350 Crooked Creek nr Norcross USGS Link    
02335450 Chattahoochee River above Roswell USGS Link Roswell NOAA Link
02335700 Big Creek Nr. Alpharetta USGS Link Alpharetta NOAA Link
02335757 Big Creek below Hog Wallow Creek in Roswell USGS Link Roswell NOAA Link
02335790 Willeo Creek at Ga 120 nr Roswell USGS Link    
02335810 Chattahoochee River at Morgan Falls Dam USGS Link    
02335815 Chattahoochee River below Morgan Falls Dam USGS Link Morgan Falls NOAA Link
023358685 Sewell Mill Creek at Ga 120 USGS Link    
02335870 Sope Creek nr Marietta USGS Link Marietta NOAA Link
02335910 Rottenwood Creek at Interstate N. Pky USGS Link    
02335990 Chattahoochee River at US Hwy 41 USGS Link    
02336000 Chattahoochee River at Atlanta USGS Link    
02336030 North Fork Peachtree Creek at Graves Road USGS Link    
02336360 Nancy Creek at Rickenbacker Dr USGS Link Buckhead NOAA Link
02336410 Nancy Creek at West Wesley Road USGS Link